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Artículos de revistas sobre el tema "Gravimetrisk metod"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

Noviyanty, Yuska Noviyanty, Herlina Herlina y Cahyan Fazihkun. "IDENTIFICATION AND DETERMINATION OF SAPONIN LEVELS FROM BIDURROT EXTRACT (Calotropis gigantea L) USING GRAVIMETRY METHOD". Journal of Pharmaceutical And Sciences 3, n.º 2 (31 de diciembre de 2020): 100–105. http://dx.doi.org/10.36490/journal-jps.com.v3i2.52.

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Biduri plants (Calotropis gigantea L) are used as medicinal plants, namely as cough and anti-allergic medicines. Research conducted by (Suchita Siggn. 2014) shows the presence of glycoside compounds, saponins, alkaloids, flavonoids, and tannins. then the researchers are interested in carrying out research on the identification and determination of saponin levels from the extract of the baby root (Calotropis gigantea L) by the Gravimetri method. Qualitative test was carried out by inserting 500 mg of biduri root extract (Calotropis gigantea L) into a test tube, then adding 10 ml of hot water, shaking vigorously for 10 seconds and adding HCL, then a quantitative test was carried out using the gravimetric method. Based on the results of research that has been carried out the extract of the betel root (Calotropis gigante L) positive containing saponin compounds with saponin content is 2.6% with a weight of 1.16 gram saponins using the gravimetric method

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Noviyanty, Yuska Noviyanty, Herlina Herlina y Cahyan Fazihkun. "IDENTIFICATION AND DETERMINATION OF SAPONIN LEVELS FROM BIDURROT EXTRACT (Calotropis gigantea L) USING GRAVIMETRY METHOD". Journal of Pharmaceutical And Sciences 3, n.º 2 (31 de diciembre de 2020): 100–105. http://dx.doi.org/10.36490/journal-jps.com.v3i2.52.

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Biduri plants (Calotropis gigantea L) are used as medicinal plants, namely as cough and anti-allergic medicines. Research conducted by (Suchita Siggn. 2014) shows the presence of glycoside compounds, saponins, alkaloids, flavonoids, and tannins. then the researchers are interested in carrying out research on the identification and determination of saponin levels from the extract of the baby root (Calotropis gigantea L) by the Gravimetri method. Qualitative test was carried out by inserting 500 mg of biduri root extract (Calotropis gigantea L) into a test tube, then adding 10 ml of hot water, shaking vigorously for 10 seconds and adding HCL, then a quantitative test was carried out using the gravimetric method. Based on the results of research that has been carried out the extract of the betel root (Calotropis gigante L) positive containing saponin compounds with saponin content is 2.6% with a weight of 1.16 gram saponins using the gravimetric method

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3

DEME, I. "AVALIAÇÃO DA INCERTEZA DE MEDIÇÃO NA CALIBRAÇÃO DE MEDIDOR DE VAZÃO DE LÍQUIDOS PELO MÉTODO GRAVIMÉTRICO". Revista SODEBRAS 15, n.º 174 (junio de 2020): 99–101. http://dx.doi.org/10.29367/issn.1809-3957.15.2020.174.99.

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Chrastina, J., L. Staroňová, I. Vitázek y M. Pšenka. "Analysis of residual biomass of liquid biofuels using gravimetric method and combustion heat". Research in Agricultural Engineering 61, Special Issue (2 de junio de 2016): S21—S25. http://dx.doi.org/10.17221/22/2015-rae.

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The using possibilities of secondary raw materials produced during the liquid biofuels production such as bioethanol and biodiesel, and also those produced during solid fuel production was determined. The study presents combustion of distiller’s dried grain with solubles (DDGS) and pressing refuse of rapeseed methyl ester (RME). The combustion was done in gravimetric oven, according to the standards, under the laboratory conditions. Combustion heat of samples was measured with calorimeter IKA C5000. The results show the average combustion heat of 20.91 MJ/kg for DDGS and 18.996 MJ/kg for RME. Results are chronologically presented in tables and figures.

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Zhang, Xi Ming y Xue Li. "Gravimetric Method for Calibrating Flow Meter". Applied Mechanics and Materials 501-504 (enero de 2014): 2335–37. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.2335.

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What the earth obtain the energy annually is ten thousand times of the earth energy consumption at present,but the solar energy has a lower energy density on the earth’s surface .solar energy is the main source of all energy The experimental research was conducted for the heating performance utilizing the solar-assisted heat pump experimental platform. Experimental errors will be caused to flow meter by different measured media and long time usage In order to improve measurement precision and reduce the experimental errors, this test use gravimetric method to calibrate the LZB glass rotor meter and MCE08-787 cumulative flow meter of indoors and outdoors pipes. The paper also presents flow correction coefficient to guarantee both the accuracy and reliability of the experimental results.

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Rahman, Azman Ab, Hafidzi Hamdan, Dg Nooremah Ag Said y Abdul Rahman Mohamed. "Determination of Mudd Volume Using Gravimetric Method". Advanced Science Letters 23, n.º 5 (1 de mayo de 2017): 4557–59. http://dx.doi.org/10.1166/asl.2017.8903.

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Vecellio None, Laurent, Daniel Grimbert, Joelle Bordenave, Guy Benoit, Yves Furet, Brigitte Fauroux, Eric Boissinot, Michele De Monte, Etienne Lemarié y Patrice Diot. "Residual Gravimetric Method to Measure Nebulizer Output". Journal of Aerosol Medicine 17, n.º 1 (marzo de 2004): 63–71. http://dx.doi.org/10.1089/089426804322994479.

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Rosenberger, Franz, J. Iwan, D. Alexander y Wei‐qing Jin. "Gravimetric capillary method for kinematic viscosity measurements". Review of Scientific Instruments 63, n.º 9 (septiembre de 1992): 4196–99. http://dx.doi.org/10.1063/1.1143234.

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9

Zhou, X., B. Zhong y X. Li. "Gravimetric terrain corrections by triangular‐element method". GEOPHYSICS 55, n.º 2 (febrero de 1990): 232–38. http://dx.doi.org/10.1190/1.1442831.

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Terrain corrections for gravity data are a critical concern in rugged topography, because the magnitude of the corrections may be large relative to the anomalies of interest. The terrain‐correction process, however, is very tedious. At present, rectangular prism and fan‐shaped prism methods are commonly used for the corrections; but these methods assume elements have horizontal tops, an assumption which does not reflect true topography, especially near the station. A triangular‐element method which allows dipping surfaces has been developed using a Gaussian formulation to improve the correction process. This method involves a simple formula employing a surface rather than a volume integral for computing the terrain corrections with high accuracy.

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Martinsen, Ørjan G., Sverre Grimnes, Jon K. Nilsen, Christian Tronstad, Wooyoung Jang, Hongsig Kim, Kunsoo Shin, Majid Naderi y Frank Thielmann. "Gravimetric Method forin VitroCalibration of Skin Hydration Measurements". IEEE Transactions on Biomedical Engineering 55, n.º 2 (febrero de 2008): 728–32. http://dx.doi.org/10.1109/tbme.2007.912651.

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Łyczko, Wojciech, Beata Olszewska y Edyta Nowicka. "ASSESSMENT OF THE RESULTS OF SOIL MOISTURE MEASUREMENTS CONDUCTED WITH THE GRAVIMETRIC METHOD AND THE TDR METHOD IN THE ODER VALLEY". Acta Scientiarum Polonorum Formatio Circumiectus 2 (2017): 159–66. http://dx.doi.org/10.15576/asp.fc/2017.16.2.159.

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Dwirastina, Mirna. "TEKNIK MENGHITUNG TELUR IKAN BUJUK (Channa lucius) DENGAN METODE GRAVIMETRIK". BULETIN TEKNIK LITKAYASA Sumber Daya dan Penangkapan 7, n.º 1 (30 de noviembre de 2016): 1. http://dx.doi.org/10.15578/btl.7.1.2009.1-2.

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Ikan bujuk termasuk kerabat Channa yang hidup di air tawar terutama di lebak-lebak, hutan rawang, dan rawa banjiran. Ikan ini merupakan salah satu ikanyang menghasilkan telur (ovivar) dalam proses reproduksi. Jumlah telur (fekunditas) ikan sangat ditentukan oleh beberapa hal antara lain ukuran tertentu, spesies, umur, makanan, dan lain-lain.

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Fuadi, Nurul y Ayu Annisa Amir. "ANALISIS KANDUNGAN SiO2 PADA BATUAN GREEN TUFF DENGAN METODE GRAVIMETRIK". Jambura Physics Journal 2, n.º 2 (24 de septiembre de 2020): 89–95. http://dx.doi.org/10.34312/jpj.v2i2.6975.

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Research has been conducted on the content of Silica dioxide (SiO2) in Green Tuff rocks from Bone of South Sulawesi Province. This Green Tuff rock is a type of sedimentary rock formed from volcanic ash released from a pit during a volcanic eruption. This research uses the gravimetric method which is analytical chemical method by weighing the sample that has been melted as much as 0.5 grams then adding enough distilled water, 10 ml of HCl and 5 ml of HNO3, after that it is heated to dry and added 5 mL of HCl. Reheat until the volume becomes half of the initial volume and added distilled water afterwards, cooled and filtered. The purpose of adding HCl and HNO3 is so that the silica content can be separated from the impurities so that a larger crystal-shaped silica precipitate and a yellowish-colored solution containing impurities are present in the precipitate. So that in this study the results of the analysis of the content of Silica dioxide (SiO2) of 76.50%.

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Budiarto, Muhammad Al Rizky Ratno, Johan Iskandar y Tri Dewi Kusumaningrum Pribadi. "Cadangan Karbon pada Ekosistem Padang Lamun di Siantan Tengah Taman Wisata Perairan Kepulauan Anambas". Jurnal Kelautan Tropis 24, n.º 1 (2 de diciembre de 2020): 45–54. http://dx.doi.org/10.14710/jkt.v24i1.9348.

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Secara global, ekosistem lamun dianggap sebagai penyerap karbon sehingga dapat berkontribusi terhadap mitigasi perubahan iklim. Penelitian bertujuan untuk mengetahui komposisi jenis, biomassa dan cadangan karbon pada komunitas padang lamun di perairan Siantan Tengah Taman Wisata Perairan (TWP) Kepulauan Anambas. Penelitian dilaksanakan pada bulan Agustus 2019 s.d Januari 2020. Uji kandungan karbon dilakukan dengan metode Welkley and Black sedangkan untuk mendapatkan biomassa menggunakan metode gravimetrik. Hasil penelitian menunjukkan bahwa terdapat tiga jenis lamun, yaitu Enhalus acoroides, Thalassia hemprichii, dan Cymodocea rotundata. Nilai biomassa lamun berkisar antara 171,89 – 275,68 gbk/m2 dan nilai cadangan karbon berada pada kisaran 51,89 – 80,66 gC/m2. Padang lamun di Siantan Tengah memiliki luas 130,45 ha, sehingga total Cadangan karbon pada ekosistem padang lamun di perairan Siantan Tengah diperkirakan 95,88 ton C. Penelitian ini membuktikan adanya kandungan karbon pada biomassa lamun sehingga dapat disimpulkan bahwa padang lamun berperan sebagai penyerap karbon (carbon sink). Globally, seagrass ecosystems are considered as carbon sink so that it can contribute to climate change mitigation. This research aims to determine the species composition, biomass, and carbon stock in seagrass communities in Siantan Tengah Marine Tourism Park of Anambas Islands. The research was conducted in Agustus 2019 – January 2020. The carbon content test was carried out by the Walkley and Black method while to obtain biomass using the gravimetric method. The result od study showed that there are three species of seagrasses, namely Enhalus acoroides, Thalassia hemprichii, and Cymodocea rotundata. Seagrass biomass value range 171,89 – 275,68 gbk/m2 and seagrass carbon stock value range 51,89 – 80,66 gC/m2. The area of seagrass beds in Central Siantan is 130,45 ha so that the total carbon stock estimated reach 95,88 tons C. This research proves the presence of carbon in the biomass of seagrass beds, so it can be concluded that seagrass beds act as carbon sinks.

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Sunardi, Setyani Hardiani y Aris Mukimin. "PENGEMBANGAN METODE ANALISIS PARAMETER MINYAK DAN LEMAK PADA CONTOH UJI AIR". Jurnal Riset Teknologi Pencegahan Pencemaran Industri 5, n.º 1 (31 de mayo de 2014): 1–6. http://dx.doi.org/10.21771/jrtppi.2014.v5.no1.p1-6.

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Minyak dan lemak merupakan parameter yang konsentrasi maksimumnya dipersyaratkan untuk air limbah industri dan air permukaan. Analisis infra merah dan gravimetri adalah dua metode standar yang hingga saat ini digunakan. Kelemahan metode-metode tersebut yaitu penggunaan pelarut CCl4(metode IR) dan daerah konsentrasi analisis yang besar (metode gravimetri) sehingga penting dilakukan penelitian penggunaan pelarut lain dan penurunan limit deteksi, khususnya metode gravimetri. Pelarut C2Cl4 dan S316 digunakan sebagai pelarut ekstraksi pada metode IR karena tergolong pelarut yang masih direkomendasikan untuk penggunaannya. Variasi volume sampel dan tahapan ekstraksi dengan n-heksan sebagai pelarut dilakukan untuk pengembangan metode gravimetri sehingga mampu menurunkan limit deteksi di bawah 10 mg/L. Jenis minyak yang digunakan sebagai sampel yaitu minyak nabati dan minyak mineral. Pada pembacaan absorbansi pelarut C2Cl4 dan S316 menunjukkan level respon yang sangat tinggi yaitu 18 mg/L (C2Cl4) dan 15 mg/L (S316) sehingga tidak bisa digunakan untuk analisis minyak dengan metode infra merah. Pada metode gravimetri diperoleh persen recovery 92,28% (sampel minyak nabati) dan 99,25% (sampel minyak mineral) dengan konsentrasi analit sebesar 0,9 mg/L dan 0,88 mg/L. Nilai persen recovery tersebut diperoleh pada volume sampel 2000 mL dan teknik ekstraksi 4 tahap dengan limit deteksi 0,5639 mg/L dan 0,4736 mg/L sehingga pengembangan metode gravimetri ini layak digunakan untuk analisis sampel air limbah dan air permukaan.

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16

Miyazawa, M., M. A. Pavan, E. L. de Oliveira, M. Ionashiro y A. K. Silva. "Gravimetric determination of soil organic matter". Brazilian Archives of Biology and Technology 43, n.º 5 (2000): 475–78. http://dx.doi.org/10.1590/s1516-89132000000500005.

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Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300ºC. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29, r = 0.94. The angular coefficient 3.72 for tropical soils was greater than those reported in the literature for temperate soils (from 1.68 to 2.13). The difference was due to greater oxidation degree of the organic matter. When compared with Walkley-Black method, gravimetric technique showed certain distinct advantages such as no environmental contamination with Cr6+ and improved laboratory safety eliminating the use of concentrated sulfuric acid.

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Radiyawati, Radiyawati, Diana Eka Pratiwi y Muh Yunus. "Kapasitas Adsorpsi Arang Aktif Kulit Buah Kakao (Theobroma Cacao L) terhadap Kromium (Cr) Total". Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia 20, n.º 1 (10 de junio de 2019): 71. http://dx.doi.org/10.35580/chemica.v20i1.13620.

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ABSTRAK Penelitian ini bertujuan untuk mengetahui waktu kontak optimum, dan kapasitas adsorpsi arang aktif kulit buah kakao terhadap Cr total. Penentuan kadar air dan kadar abu arang aktif kulit buah kakao menggunakan metode gravimetri, waktu kontak optimum menggunakan metode batch dengan variasi waktu yaitu 10, 20, 40, 60 dan 120 menit dan penentuan kapasitas adsorpsi menggunakan pola isotherm Freundlich dan Langmuir dengan variasi konsentrasi Cr 10, 25, 50, 75, dan 100 ppm. Banyaknya konsentrasi Cr total yang terserap diukur menggunakan Spektrofotometer Serepan Atom (SSA). Hasil penelitian yang diperoleh berupa kadar air sebesar 7,74%, dan kadar abu sebesar 8,76%. Waktu kontak optimum tercapai pada menit ke-40 dengan mengikuti pola isotherm Freundlich dengan kapasitas adsorpsi sebesar 0,0129 mg/g. Kata kunci: Adsorpsi, Arang aktif, Cr total, Kapasitas adsorpsi ABSTRACT The aims of this study was to know optimum contact time and adsorption capacity of cacao shell (Theobroma cacao L) activated charcoal towards total chromium (Cr). Determination of water and ash content use gravimetric method, optimum contact time use batch method with variation time of 10, 20, 40, 60 and 120 minutes, and adsorption capacity by use isotherm absorption of Freundlich and Langmuir with metal variation concentration of 10, 25, 50, 75, and 100 ppm. The amount of Cr total adsorpted was measured by using Atomic Absorption Spectrophotometers (AAS). The results of research obtained water content of 7.74% and ash content of 8,76%. The optimum contact time achieved in 40 minutes which follow isotherm absorption of Freundlich with adsorption capacity of 0,0129 mg/g. Keywords: Adsorption, Active charcoal, Cr total, Adsorption capacity

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Steele, J. E., S. Skarlatos, P. H. Brand, P. J. Metting y S. L. Britton. "Gravimetric Method for the Dynamic Measurement of Urine Flow". Experimental Biology and Medicine 204, n.º 1 (1 de octubre de 1993): 70–74. http://dx.doi.org/10.3181/00379727-204-43636.

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Pražák, D., J. Zůda, J. Tesař, L. Peksa y M. Vičar. "Perspectives of atmospheric reference leaks calibration by gravimetric method". Measurement 46, n.º 1 (enero de 2013): 621–27. http://dx.doi.org/10.1016/j.measurement.2012.08.021.

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Fajardo, S. y G. S. Frankel. "Gravimetric Method for Hydrogen Evolution Measurements on Dissolving Magnesium". Journal of The Electrochemical Society 162, n.º 14 (2015): C693—C701. http://dx.doi.org/10.1149/2.0241514jes.

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Castaing, C. y N. Debeglia. "A new method for combining gravimetric and geological data". Tectonophysics 204, n.º 1-2 (marzo de 1992): 151–62. http://dx.doi.org/10.1016/0040-1951(92)90276-c.

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Hefter, Glenn. "A simple gravimetric method for the determination of perchlorate". Monatshefte für Chemie - Chemical Monthly 149, n.º 2 (29 de noviembre de 2017): 323–26. http://dx.doi.org/10.1007/s00706-017-2102-x.

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Pini, Ronny, Stefan Ottiger, Arvind Rajendran, Giuseppe Storti y Marco Mazzotti. "Reliable measurement of near-critical adsorption by gravimetric method". Adsorption 12, n.º 5-6 (septiembre de 2006): 393–403. http://dx.doi.org/10.1007/s10450-006-0567-8.

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Kartika, Dwi y Mardiyah Kurniasih. "PENENTUAN KEASAMAN ZEOLIT MENGGUNAKAN METODE GRAVIMETRI, TITRASI DAN FTIR". Molekul 2, n.º 2 (1 de noviembre de 2007): 92. http://dx.doi.org/10.20884/1.jm.2007.2.2.38.

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Determination of natural zeolite and activated natural zeolite acidity using gravimetric, titration and FTIR methods had been carried out. The result of gravimetric method show that the acidity of the natural zeolite and activated natural zeolite was 2,350 and 5,628 mol/gram, respectively. The titration method can be obtained that the acidity degree of the natural zeolite and activated natural zeolite was 12,333 and 12,067, respectively. The result showed that the activation of the natural zeolite sample by HCl caused dealumination.

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Deng, Xiao Ling, Dong Jiao Guo, Wei Cai y Chun Lin Fu. "Barium Zirconium Titanate Powders Prepared by Sol–Gel Method". Advanced Materials Research 412 (noviembre de 2011): 86–89. http://dx.doi.org/10.4028/www.scientific.net/amr.412.86.

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Barium zirconium titanate, Ba (Zr0.20Ti0.80)O3(BZT) powders were prepared by sol-gel method. These powders were characterized by thermal gravimetric and differential thermal gravimetric analysis (TG-DTA), X-ray diffraction (XRD). The grain size and lattice constant were determined. The decomposition of the precursors was monitored by TG-DTA. XRD patterns reveal that BZT powders heat-treated at 800°C present single phase with perovskite type cubic structure. The average particle size of the BZT powders is about 25 nm.

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Helm, Irja, Lauri Jalukse y Ivo Leito. "A highly accurate method for determination of dissolved oxygen: Gravimetric Winkler method". Analytica Chimica Acta 741 (septiembre de 2012): 21–31. http://dx.doi.org/10.1016/j.aca.2012.06.049.

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Tubino, Matthieu y Rafael L. de Souza. "Gravimetric Method for the Determination of Diclofenac in Pharmaceutical Preparations". Journal of AOAC INTERNATIONAL 88, n.º 6 (1 de septiembre de 2005): 1684–87. http://dx.doi.org/10.1093/jaoac/88.6.1684.

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Abstract A gravimetric method for the determination of diclofenac in pharmaceutical preparations was developed. Diclofenac is precipitated from aqueous solution with copper(II) acetate in pH 5.3 (acetic acid/acetate buffer). Sample aliquots had approximately the same quantity of the drug content in tablets (50 mg) or in ampules (75 mg). The observed standard deviation was about ± 2 mg; therefore, the relative standard deviation (RSD) was approximately 4% for tablet and 3% for ampule preparations. The results were compared with those obtained with the liquid chromatography method recommended in the United States Pharmacopoeia using the statistical Student's t-test. Complete agreement was observed. It is possible to obtain more precise results using higher aliquots, for example 200 mg, in which case the RSD falls to 1%. This gravimetric method, contrary to what is expected for this kind of procedure, is relatively fast and simple to perform. The main advantage is the absolute character of the gravimetric analysis.

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Hardiyanti y Khairun Nisah. "ANALISIS KADAR SERAT PADA BAKSO BEKATUL DENGAN METODE GRAVIMETRI". AMINA 1, n.º 3 (4 de marzo de 2021): 103–7. http://dx.doi.org/10.22373/amina.v1i3.42.

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The goal of this study is to determine the level of fibre contained in bakso made from rice shiftings. The analysis employed gravimetric method with fibretherm apparatus. Firstly, the sample was defatted through n-hexanic soxhletation. After that,the gravimetric treatment was carried out in the apparatus to obtain the weight of the fibre. The data were then converted to percentage value. This step resulted the content of the fibre as following as 0.41; 0.23; 0.34; and 0.36% repectively for four samples. It shows that the level of those are below the standard of SNI 01-4439-1998.

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Bi, Zhe, Ze Yi Zhou, Xing Wang y Dong Xuan. "Preparation of Gas Standard Mixture of R134a by an Injection Method". Advanced Materials Research 1092-1093 (marzo de 2015): 784–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.784.

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An injection method was proposed for the preparation of R134a in N2 gas standards at 10 nmol/mol. The standard gravimetric method of ISO6142 was used as verification for the injection method. Results showed that good consistence between the injection method and the standard gravimetric method could be obtained. The contribution of the injection method to the standard uncertainty was about 0.92%, almost in the same order of magnitude with contribution of the standard gravimetic method.

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Windaryati, Lilis, Ngatijo Ngatijo, Pranjono Pranjono y Torowati Torowati. "PENENTUAN KADAR URANIUM DALAM SERBUK UO2 DARI YELLOW CAKE SECARA POTENSIOMETRI DAN GRAVIMETRI". Jurnal Forum Nuklir 10, n.º 2 (8 de junio de 2017): 75. http://dx.doi.org/10.17146/jfn.2016.10.2.3555.

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PENENTUAN KADAR URANIUM DALAM SERBUK UO2 DARI YELLOW CAKE SECARA POTENSIOMETRI DAN GRAVIMETRI. Telah dilakukan penentuan kadar uranium dalam serbuk UO2 dari yellow cake yang berasal dari Pusat Teknologi Bahan Galian Nuklir (PTBGN). Serbuk UO2 yang ditentukan kadar uraniumnya merupakan hasil konversi yellow cake melalui jalur amonium diuranat (ADU) dan amonium uranil karbonat (AUK). Dalam penentuan kadar uranium diperlukan suatu metode yang valid sehingga diperoleh data yang akurat. Dalam kegiatan ini dibandingkan dua metode penentuan kadar uranium dalam serbuk UO2, yaitu secara potensiometri dan secara gravimetri. Tujuannya untuk menentukan mana metode yang memberikan hasil dengan ketelitian dan presisi tinggi. Penentuan kadar uranium secara potensiometri mengacu kepada ASTM C1267-11 yang dimodifikasi dengan mereduksi pemakaian pereaksi menjadi 10% dari metode asli, sedangkan metode gravimetri mengacu kepada ASTM C1453-00 (2011). Penentuan kadar uranium secara potensiometri berdasarkan oksidasi-reduksi, sedangkan secara gravimetri berdasarkan perubahan berat setelah serbuk UO2 dikalsinasi pada temperatur 900°C selama 3 jam hingga diperoleh berat konstan. Dari kegiatan ini diperoleh hasil rerata untuk penentuan kadar uranium dalam serbuk UO2 melalui jalur ADU dan AUK secara potensiometri masing-masing adalah (87,4019 ± 0,7873) % dan (87,5575 ± 0,4775) %, sedangkan secara gravimetri masing-masing adalah (87,5241 ± 0,0432) % dan (87,4492 ± 0,0440) %. Uji t dari kedua metode menunjukkan bahwa hasil penentuan kadar uranium tidak mempunyai perbedaan yang signifikan. Oleh sebab itu, penentuan kadar uranium dalam serbuk UO2 pada penelitian berikutnya digunakan metode gravimetri karena lebih mudah tahapan pengerjaannya dibandingkan dengan metode potensiometri.

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Singh, Punit y Prabal Talukdar. "Determination of Desorption Isotherms of Potato Using Gravimetric Method and Fast Isotherm Method". Heat Transfer Engineering 41, n.º 6-7 (19 de enero de 2019): 513–21. http://dx.doi.org/10.1080/01457632.2018.1546735.

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32

Smrke, Samo, Marco Wellinger, Tomonori Suzuki, Franz Balsiger, Sebastian E. W. Opitz y Chahan Yeretzian. "Time-Resolved Gravimetric Method To Assess Degassing of Roasted Coffee". Journal of Agricultural and Food Chemistry 66, n.º 21 (noviembre de 2017): 5293–300. http://dx.doi.org/10.1021/acs.jafc.7b03310.

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33

Xie, Y. H., H. J. Yu, Y. N. Ou y C. D. Li. "Determination of phosphorus content in LiFePO4 by improved gravimetric method". Materials Research Innovations 19, sup5 (mayo de 2015): S5–1285—S5–1288. http://dx.doi.org/10.1179/1432891714z.0000000001295.

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34

Wang, Jin-Tao, Zhi-Hao Li, Chao-Yun Chen, Lin Tong, Zi-Yong Liu, Xue-Song Bao y Xiao-Hui Zhao. "Research on Non-Gravimetric Method for Micro Liquid Volume Measurement". Sensor Letters 13, n.º 10 (1 de octubre de 2015): 888–94. http://dx.doi.org/10.1166/sl.2015.3545.

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Aminabhavi, Tejraj M., Sujata F. Harlapur y J. Dale Ortego. "Solvent resistivity testing of fluoroelastomers using a gravimetric sorption method". Polymer Testing 16, n.º 1 (febrero de 1997): 91–102. http://dx.doi.org/10.1016/s0142-9418(96)00031-1.

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36

HONMA, Haruo, Hisako YANASHIMA, Mutsuko YOSHIDA y Keiko SUZUKI. "Gravimetric determination of silicon in octaphenyl cyclotetrasiloxane by ashing method." Bunseki kagaku 36, n.º 6 (1987): 376–80. http://dx.doi.org/10.2116/bunsekikagaku.36.6_376.

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37

Cranker, Kenneth J., Katherine M. Phillips, Maria Carmen Rita V. Gonzales y Kent K. Stewart. "Fine Tuning a Bile-Enzymatic-Gravimetric Total Dietary Fiber Method". Journal of AOAC INTERNATIONAL 80, n.º 1 (1 de enero de 1997): 89–94. http://dx.doi.org/10.1093/jaoac/80.1.89.

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Abstract A recently proposed bile-enzymatic-gravimetric total dietary fiber (TDF) method was modified and the new procedure was compared with the original method, the traditional AOAC enzymatic-gravimetric determination (AOAC Official Method 985.29), and another simplified AOAC procedure by analyzing several diet composites, including National Institute of Standards and Technology 1548 total diet reference material. The original and modified bile-enzymatic-gravimetric procedures also were compared by analyzing 9 food samples from a collaborative study of the original method. The modified method consistently yielded values about 10% lower than the original method but closer to reference values and to values from AOAC Offical Method 985.29, suggesting results that are more in line with accepted TDF standard methodology. Our modified method was used to analyze 180 fresh-frozen diet composites with TDF values ranging from 0.6 to 3.2 g/100 g wet weight. Samples were from 2 multicenter feeding studies sponsored by the National Heart, Lung and Blood Institute: DELTA (Dietary Effects on Lipoproteins and Thrombogenic Activity) and DASH (Dietary Approaches to Stop Hypertension). The mean relative standard deviation (RSD) for duplicate analyses was 1.1%. For 40 assays of a quality control diet composite over 9 months, the standard deviation was 0.1 g/100 g wet weight (4.9% RSD), indicating the method’s excellent precision for routine use.

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38

Kundu, Dipali y S. K. Roy. "A Gravimetric Method for Determination of Water in Phosphate Glasses". Transactions of the Indian Ceramic Society 47, n.º 5 (enero de 1988): 147–55. http://dx.doi.org/10.1080/0371750x.1988.10822912.

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Language, B., S. J. Piketh y R. P. Burger. "Correcting respirable photometric particulate measurements using a gravimetric sampling method". Clean Air Journal 26, n.º 1 (3 de junio de 2016): 10–14. http://dx.doi.org/10.17159/2410-972x/2016/v26n1a7.

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According to the National Environmental Management: Air Quality Act of 2004 people have the right to clean air and a healthy environment. Particulate matter (PM) emissions pose a significant health threat. Both indoor and ambient air pollution contribute to the burden of disease associated with poor air quality. This is particularly true within the South African setting where low income households make use of different solid fuels for heating and cooking purposes resulting in high levels of PM emissions. This paper focuses on the evaluation mass concentration measurements recorded by continuous photometric PM instruments within KwaDela, a low income settlement in Mpumalanga located on the South African Highveld. Thus, obtaining a photometric calibration factor for both the DustTrak Model 8530 and the SidePak AM510. Sampling took place during August 2014 for a period of seven days. The photometric and gravimetric instruments were collocated within the indoor environment of selected households. These instruments were all fitted with 10mm Dorr-Oliver Cyclone inlets to obtain the respirable (PM4) cut-point. The study found that both instruments tend to overestimate the indoor particulate mass concentrations when compared to the reference gravimetric method. The estimated photometric calibration factors for the DustTrak Model 8530 and SidePak AM510 are 0.14 (95%Cl: 0.09, 0.15) and 0.24 (95%Cl: 0.16, 0.30) respectively. The overestimation of the photometric measurements is rather significant. It is therefore important that the correction factors are applied to data collected in indoor environments prone to the combustion of solid fuels. The correction factors obtained from this and other studies vary as a result of the environment (ambient, indoor etc.) as well as the aerosol size fraction and the origin thereof. Thus, it is important to considered site specific calibration factors when implementing these photometric light-scattering instruments.

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Thu, Kyaw, Young-Deuk Kim, Azhar Bin Ismil, Bidyut Baran Saha y Kim Choon Ng. "Adsorption characteristics of methane on Maxsorb III by gravimetric method". Applied Thermal Engineering 72, n.º 2 (noviembre de 2014): 200–205. http://dx.doi.org/10.1016/j.applthermaleng.2014.04.076.

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Nechitailov, A. A., E. V. Astrova y Yu A. Kukushkina. "Gravimetric method to find internal surface of macroporous silicon membranes". physica status solidi (c) 4, n.º 6 (mayo de 2007): 1923–27. http://dx.doi.org/10.1002/pssc.200674329.

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42

Gamas, L. y J. S. Lee. "Density indicator method to measure pulmonary blood flows". Journal of Applied Physiology 60, n.º 1 (1 de enero de 1986): 327–34. http://dx.doi.org/10.1152/jappl.1986.60.1.327.

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The injection of plasma, saline, or erythrocyte (RBC) concentrate into the pulmonary circulation produces a change in the gravimetric density of the blood outflow similar to the dilution curve of dye. We used an improved density-measuring system to assess the flow of these density indicators through the lung in vivo and in vitro perfused dog lobe. From the in vitro density-dilution curves of plasma and RBC concentrate we calculated the pulmonary flow rate and found it to be 1.04 +/- 0.02 (SD) times the measured one. The outflow-dilution curves of gravimetric density were not as broad as those of optical density following in vivo injection of plasma bolus containing indocyanine green, and the gravimetric measurements dipped to base line, whereas the optical measurement did not. The density-dilution curves of isotonic saline injection are similar to that of plasma. Following injection of RBC concentrates with the dye, density changes in the pulmonary outflow lag behind the emergence of the dye. This was presumably related to RBC aggregation in the concentrates. In reference to the injected plasma, no loss in the density indicators for saline and RBC injection was observed. Based on these results and the similarity of the density indicators to the blood, we conclude that the plasma and isotonic saline are good density indicators to be used for the determination of pulmonary blood flows.

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Lyszkowicz, Adam, Monika Birylo y Kazimierz Becek. "A new geoid for Brunei Darussalam by the collocation method". Geodesy and Cartography 63, n.º 2 (1 de diciembre de 2014): 183–98. http://dx.doi.org/10.2478/geocart-2014-0013.

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Abstract Computation of a new gravimetric geoid in Brunei was carried out using terrestrial, airborne and altimetric gravity data and the EGM08 geopotential model by the collocation method. The computations were carried out by the „remove-restore” technique. In order to have better insight in the quality of input data the estimation of accuracy of the gravity data and geoid undulations from GPS/levelling data was carried out using EGM08 geopotential model. It shows a poor quality of GPS/levelling data. Result of the computation is the gravimetric geoid for the territory of Brunei computed by collocation method with an accuracy estimated below of ±0.3 m.

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44

Hasanov, A. S. "Tectonic state and oil-gas prospects of Khidirly-Bandovan structure according to the new gravimetric data". Azerbaijan Oil Industry, n.º 6 (15 de junio de 2020): 11–18. http://dx.doi.org/10.37474/0365-8554/2020-6-7-11-18.

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Khidirly-Bandovan structures have been studied through geological mapping, structural exploration drilling, geophysical methods (gravimetric, magnetic, electrical, seismic exploration methods) since the 1930s. Small amount of oil from different wells in the upper part of Productive Series (PS) and huge amount of gas fountain from Middle Absheron sediments have been obtained. As the interest to these areas had not decreased, the geophysical surveys continued during further years. Seismic exploration surveys were executed in Bandovan structure via Common Depth Point (CDP) method in 2004, refracted ray method and gravimetric exploration complex in 2006 and 3D seismic exploration works and gravimetric investigations with “Scintrex CG-5 Autograv” devices in 2016, correspondingly. In the result of analysis of distribution characteristics for local gravimetric anomalies, as well as 3D descriptions of new gravimetric data, up-to-date logs on tectonic state of Khidirly-Bandovan structure have been obtained and as the new oil-gas exploration objects, the west and south-west wings of these structures highlighted.

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Doctorvaladan, Sahar, Andrea Jelks, Eric Hsieh, Robert Thurer, Mark Zakowski y David Lagrew. "Accuracy of Blood Loss Measurement during Cesarean Delivery". American Journal of Perinatology Reports 07, n.º 02 (abril de 2017): e93-e100. http://dx.doi.org/10.1055/s-0037-1601382.

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Objective This study aims to compare the accuracy of visual, quantitative gravimetric, and colorimetric methods used to determine blood loss during cesarean delivery procedures employing a hemoglobin extraction assay as the reference standard. Study Design In 50 patients having cesarean deliveries blood loss determined by assays of hemoglobin content on surgical sponges and in suction canisters was compared with obstetricians' visual estimates, a quantitative gravimetric method, and the blood loss determined by a novel colorimetric system. Agreement between the reference assay and other measures was evaluated by the Bland–Altman method. Results Compared with the blood loss measured by the reference assay (470 ± 296 mL), the colorimetric system (572 ± 334 mL) was more accurate than either visual estimation (928 ± 261 mL) or gravimetric measurement (822 ± 489 mL). The correlation between the assay method and the colorimetric system was more predictive (standardized coefficient = 0.951, adjusted R2 = 0.902) than either visual estimation (standardized coefficient = 0.700, adjusted R2 = 00.479) or the gravimetric determination (standardized coefficient = 0.564, adjusted R2 = 0.304). Conclusion During cesarean delivery, measuring blood loss using colorimetric image analysis is superior to visual estimation and a gravimetric method. Implementation of colorimetric analysis may enhance the ability of management protocols to improve clinical outcomes.

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Setyawan, Galih y Pratiwi Indah Tri Lestari. "Pengaruh Kontribusi Ketidakpastian Terhadap Pelaporan Nilai Porositas Menggunakan Metode Gravimetri". JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS 9, n.º 2 (9 de noviembre de 2017): 97–102. http://dx.doi.org/10.25077/jif.9.2.97-102.2017.

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Metode gravimetri berhasil diterapkan untuk menentukan nilai porositas batu kapur. Metode tersebut dilakukan dengan menggunakan timbangan standar terkalibrasi dan gelas ukur terkalibrasi untuk menentukan volume pori dan volume total dari sampel batu kapur. Porositas ditentukan dari hasil perbandingan antara volume pori dan volume total tersebut. Nilai ketidakpastian tipe A dibandingkan dengan hasil perhitungan ketidakpastian gabungan (Ugab) dengan menambahkan ketidakpastian tipe B yang bersumber dari sertifikat gelas ukur, timbangan dan temperatur. Hasilnya menunjukkan bahwa ketidakpastian tipe B menjadi penyebab utama meningkatnya nilai ketidakpastian pengukuran porositas batu kapur hingga 6%. Namun ketidakpastian tipe B seringkali diabaikan pada pelaporan hasil pengukuran. Kata kunci : Ketidakpastian, Porositas, Gravimetri

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47

Manoussakis, Gerassimos, Romylos Korakitis y Paraskevas Milas. "Gravimetric estimation of the Eötvös matrix components". Contributions to Geophysics and Geodesy 47, n.º 1 (28 de marzo de 2017): 53–68. http://dx.doi.org/10.1515/congeo-2017-0004.

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Abstract The components of the Eötvös matrix are useful for various geodetic applications, such as interpolation of the elements of the deflection of the vertical, determination of gravity anomalies and determination of geoid heights. A torsion balance instrument is customarily used to determine the Eötvös components. In this work, we show that it is possible to estimate the Eötvös components at a point on the Earth’s physical surface using gravity measurements at three nearby points, comprising a very small network. In the first part, we present the method in detail, while in the second part we demonstrate a numerical example. We conclude that this method is able to estimate the components of the Eötvös matrix with satisfactory accuracy.

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48

Mushoddiqoh, Diina Qiyaman, Bernadus H. Sirenden, Tatik Maftukhah y Nur Tjahyo Eka. "KARAKTERISASI VOLUME KALIBRATOR ALAT PENAKAR CURAH HUJAN MENGGUNAKAN METODE GRAVIMETRI". Jurnal Standardisasi 20, n.º 1 (30 de abril de 2018): 11. http://dx.doi.org/10.31153/js.v20i1.591.

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<p>Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) memiliki alat ukur curah hujan yang tersebar di 180 lokasi stasiun pemantau cuaca di seluruh daerah Indonesia. Alat ukur ini perlu dikalibrasi secara berkala untuk menjamin hasil pengukuran dan ketertelusurannya. Tim peneliti Puslit Metrologi LIPI bekerjasama dengan BMKG mengembangkan kalibrator curah hujan yang dapat dibawa dan mudah untuk digunakan. Karakterisasi dilakukan pada kalibrator ini sebagai jaminan hasil pengukuran dan pengujian untuk memenuhi standar. Karakterisasi dilakukan dengan metode gravimetri menggunakan timbangan mengacu pada prosedur kalibrasi Laboratorium Volume Puslit Metrologi LIPI. Kecepatan aliran air diatur dengan pompa dalam satuan Pulse Width Modulation (PWM), dan parameter – parameter pengukuran ditampilkan pada aplikasi di dalam komputer. Telah dilakukan pengambilan data untuk karakterisasi kalibrator curah hujan dengan hasil volume rata – rata pada kondisi standar (20oC) sebesar 970 ml, 966 ml, dan 971 ml pada PWM pompa 100, 150, dan 255. Ketidakpastian bentangan yang didapat sebesar 3 ml. Dari hasil karakterisasi dan simulasi perhitungan didapat ketidakpastian bentangan sebesar 1% untuk curah hujan di atas 18 mm. Hasil tersebut memenuhi standar ketidakpastian maksimal pengukuran curah hujan sebesar 2% untuk kadar curah hujan 0 – 500 mm. </p>

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49

Guleli, Muge, Sezin İşsev, Cem Caliskan y Mahmut Ozbek. "Determination of simethicone in different drug formulations by gravimetry and comparison with the FTIR method". Journal of Chemical Metrology 14, n.º 2 (1 de diciembre de 2020): 153–59. http://dx.doi.org/10.25135/jcm.44.20.07.1701.

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Fourier transform infrared (FTIR) spectroscopy was mostly used in both pharmacopeia and literature studies to determine the assay of simethicone (SMT) in pharmaceuticals. It should be noted that HPLC is used less frequently. As an alternative to the mentioned methods a new, simple, fast, easy-to-apply and very cheap gravimetric method was developed and validated according to ICH guidance entitled Q2B Validation of Analytical Procedures: Methodology for the quantification analysis of simethicone in different pharmaceutical forms. For the simethicone suspension product provided to alleviate too much gas in the gastrointestinal tract, the simethicone amount was determined both by the validated gravimetric method and by the FTIR method defined in the USP and BP monographs, and the results were within the acceptance criteria. It is emphasized that there is no significant difference between the results of gravimetric and FTIR methods according to the calculated F- and t-test results.

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50

An, Li Juan, Jun Wang, Tie Feng Zhang, Han Lin Yang y Zhi Hui Sun. "Synthesis of ZnO Nanoparticles by Direct Precipitation Method". Advanced Materials Research 380 (noviembre de 2011): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.380.335.

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In this study, Zinc oxide (ZnO) nanoparticles were prepared using Zinc nitrate (Zn(NO3)2) and Ammonium carbonate ((NH4)2CO3) in aqueous solutions with proper concentration by a direct precipitation method. The properties of ZnO nanoparticles synthesized were characterized by the thermal gravimetric (TG) and differential thermal gravimetric (DTG), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM), respectively. Both TG and DTG curves of the precursor precipitates show that no further mass loss and thermal effect were observed above the temperature 450°C. The FT-IR results indicated that the precursor of ZnO nanoparticles was zinc hydroxy carbonate. The XRD results show that the prepared ZnO nanoparticles were pure wurtzite structures. TEM photographs demonstrated that ZnO nanoparticles were of a pseudo-spherical shape with an average crystal size of about 65 nm.

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