Relevant bibliographies by topics / Flame-emission spectrophotometry

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Flame-emission spectrophotometry'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Flame-emission spectrophotometry.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Flame-emission spectrophotometry"

1

Saud, Ali M., Mikhail A. Smagin, and Vera I. Vasil’eva. "Features of sodium determination in dilute mixed solutions with phenylalanine by flame photometry." Industrial laboratory. Diagnostics of materials 86, no. 1 (January 30, 2020): 13–18. http://dx.doi.org/10.26896/1028-6861-2020-86-1-13-18.

Full text
Abstract:
Flame spectrophotometry is one of the main methods for determining alkali and alkaline earth metals in solutions. Chemical analysis by the flame photometric method have become of great importance for estimation of trace elements content and for work on small quantities of sample. The most important disadvantages of flame spectrophotometry are different types of interference (spectral, chemical, and physical). The paper considers mainly the physical interference which directly relates to the state of the sample itself and includes solution temperature, viscosity, surface tension, and vapor pressure. These effects are interdependent and not easily isolated for study. The addition of a substance increases the viscosity of the solution, which affects aerosol formation, transport, droplet size distribution, evaporation rate and flame temperature. All that leads to a decrease in the intensity of light emission. In the present article, the effect of phenylalanine on the sodium determination by the flame photometric method in the field of dilute solutions was studied. A decrease in the photocurrent emission of sodium in its joint determination with phenylalanine was found. The main reason is the increase in viscosity. It leads to a reduction in the spraying rate in the analyzer and a diminution in the analytical response of the device. The systematic type of errors in determining the concentration of sodium in the presence of phenylalanine is proved.
APA, Harvard, Vancouver, ISO, and other styles
2

Busch, Marianna A., and Kenneth W. Busch. "Signal-to-Noise Comparison of Flame/Furnace Infrared Emission (FIRE) Spectrometry with Room-Temperature, Nondispersive Infrared Absorption Spectrophotometry." Applied Spectroscopy 47, no. 7 (July 1993): 912–21. http://dx.doi.org/10.1366/0003702934415138.

Full text
Abstract:
A theoretical model has been developed for the comparison of the performance of a detector-noise-limited, flame infrared emission (FIRE) spectrometer with that of a room-temperature, nondispersive, infrared absorption (NDIR) spectrophotometer. The ratio of the signal-to-noise ratio (SNR) in emission to that in absorption is found to depend on the product of five terms: (1) the ratio of the noise in absorption to that in emission; (2) the ratio of the solid angles in emission and absorption; (3) the ratio of the pathlengths in emission and absorption; (4) the ratio of the number densities in emission and absorption; and (5) the ratio of the Boltzmann factor for the flame to the Bose-Einstein factor for the blackbody source. Implications for gas chromatographic detection are considered. Under conditions in which chemical conversion of the sample into an infrared-active species is not required and both measurements employ an uncooled PbSe detector, a sample cell volume of 30 μL, and a filter bandwidth of 0.30 μm at a wavelength 4.35 μm (the antisymmetric stretching vibration of CO2), the major factor which determines the ratio of the two SNRs will be the ratio of the solid angle × pathlength product, which has a constant value of 100, regardless of the sample cell path-length chosen. If a hydrogen/air flame is used in emission (2272 K) and a Nernst glower is used in absorption (1800 K), the FIRE spectrometer is predicted to produce an SNR that is at least 19 times better than that produced by the corresponding NDIR absorption photometer, regardless of the pathlength of the absorption cell.
APA, Harvard, Vancouver, ISO, and other styles
3

Cowell, D. C., and P. M. McGrady. "Direct-measurement ion-selective electrodes: analytical error in hyponatremia." Clinical Chemistry 31, no. 12 (December 1, 1985): 2009–12. http://dx.doi.org/10.1093/clinchem/31.12.2009.

Full text
Abstract:
Abstract Using two commercial direct ion-selective-electrode sodium and potassium analyzers, we found lower sodium values in cases of hyponatremia as compared with those by flame emission spectrophotometry or indirect ion-selective-electrode analyzers. It is shown that these errors can be eliminated by modifying the calibrant, and that there is a requirement for internationally agreed-upon reference standards for use by manufacturers and laboratory personnel to assess analytical performance of these analyzers.
APA, Harvard, Vancouver, ISO, and other styles
4

Garbarino, J. R., B. E. Jones, G. P. Stein, W. T. Belser, and H. E. Taylor. "Statistical Evaluation of an Inductively Coupled Plasma Atomic Emission Spectrometric Method for Routine Water Quality Testing." Applied Spectroscopy 39, no. 3 (May 1985): 535–41. http://dx.doi.org/10.1366/0003702854248458.

Full text
Abstract:
In an interlaboratory test, inductively coupled plasma atomic emission spectrometry (ICP-AES) was compared with flame atomic absorption spectrometry and molecular absorption spectrophotometry for the determination of 17 major and trace elements in 100 filtered natural water samples. No unacceptable biases were detected. The analysis precision of ICP-AES was found to be equal to or better than alternative methods. Known-addition recovery experiments demonstrated that the ICP-AES determinations are accurate to between ±2 and ±10 percent; four-fifths of the tests yielded average recoveries of 95–105 percent, with an average relative standard deviation of about 5 percent.
APA, Harvard, Vancouver, ISO, and other styles
5

Popov, P., V. Otruba, and L. Sommer. "Determination of lithium in blood serum — a comparison between molecular absorption spectrophotometry and emission flame spectrometry." Clinica Chimica Acta 154, no. 3 (February 1986): 223–25. http://dx.doi.org/10.1016/0009-8981(86)90035-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Mihaljev, Zeljko, Zeljko Cupic, Milica Zivkov-Balos, and Sandra Jaksic. "Levels of macroelements and toxic elements in herbal teas." Chemical Industry 69, no. 2 (2015): 143–53. http://dx.doi.org/10.2298/hemind130424029m.

Full text
Abstract:
A total of 14 diverse herbal teas were examined, including: yarrow, basil, St.John?s wort, peppermint, horsetail, nettle, thyme, corn silk, hibiscus, marshmallow, chamomile, rosehip, heather and wild mint. The samples were prepared using the method of microwave digestion, and measurements were performed by the use of inductively coupled plasma mass spectrometry (Cd, Hg, Pb, As, Sb); atomic absorption spectrometry (Mg); emission flame photometry (Ca, K, Na) and spectrophotometry (P). Intervals of variation (mg/kg) for macroelements were: Ca (2738-35399); P (1545-6264); Mg (1647-7816); Na (293-10629) and K (9683-33985), and for toxic elements: Cd (0.014-0.645); Hg (<0.001- 0.017); Pb (0.064-1.340); As (0.030-0.544) and Sb (0.004-0.068). In the three samples (yarrow and two St.John?s wort samples) measured cadmium concentration was higher than the maximum level for dried herbs, recommended by WHO. Ward's hierarchical clustering method was performed with the aim of grouping herbal teas by the amount of toxic elements.
APA, Harvard, Vancouver, ISO, and other styles
7

Rizzon, Luiz Antenor, Alberto Miele, and Jean-Pierre Rosier. "Discrimination of wines from the Mercosul countries according to their mineral composition." OENO One 31, no. 1 (March 31, 1997): 43. http://dx.doi.org/10.20870/oeno-one.1997.31.1.1094.

Full text
Abstract:
<p style="text-align: justify;">The chemical and sensory characteristics of wines are related to the natural factors of their viticultural areas. The existing soil and climate diversity of the Mercosul countries is favorable to the elaboration of wines with different chemical composition. The mineral elements have already been studied to characterize wines from several viticultural regions all over the world. But the discrimination of wines from the Mercosul countries according to their mineral composition has not been done yet. The objective of this work was to characterize wines from Argentina, Brazil and Uruguay according to their mineral composition. Thirty-one wines were analyzed: 11 were from Argentina, 10 from Brazil and 10 from Uruguay; in relation to the type of wine, 10 were white, 11 rosé and 11 red ones. The analyses were made through the atomic absorption spectrophotometry; flame emission spectrophotometry; and colorimetry. The principal component analysis showed that the axes 1,2 and 3 explained 38.6%, 28.2% and 10.4% of the total variation. The principal component analysis made it possible to discriminate the wines from these three countries apart. The mineral elements which showed the highest discriminant effect were Li, Mg, P, K, Rb, Na, Mn and Fe. The Argentinian wines showed higher contents of minerals, specially the Li, Na, Mg and P; the Brazilian ones had higher levels of Rb and Mn; the Uruguayan wines showed an intermediary composition.</p>
APA, Harvard, Vancouver, ISO, and other styles
8

Bomfim, Guilherme V. do, Juan Manzano, Benito M. de Azevedo, Denise V. Vasconcelos, and Thales V. de A. Viana. "Potassium distribution in drip irrigation with fertigation for different injection distances in the main line." Engenharia Agrícola 34, no. 6 (December 2014): 1150–61. http://dx.doi.org/10.1590/s0100-69162014000600011.

Full text
Abstract:
The purpose of this research was to evaluate the K2O distribution uniformity by surface drip irrigation at Universitat Politecnica de Valencia, Valencia, Spain (39º 29′ N, 0º 23′ W, 20 m). The irrigation was performed by drip lines with not-compensated emitters, spaced 0.3 m. The fertigation was realized using a fertilizer injector pump of electric action with injection of 0.25 h. The experimental design used completely randomized blocks with five treatments and four replications. The treatments consisted of injection in five distances, located at 10; 20; 30; 40; 50 m of the first drip line. Samples were collected in emitters located at the start, at 1/3, at 2/3 and at the end of the drip lines. The nutrient concentration was determined by flame spectrophotometry. The Christiansen's uniformity coefficients (CUC), of distribution (DUC), of statistical (SUC) and of emission (eUC) were estimated. The K2O concentration and distribution decreased linearly with the increase of the injection distance. In all treatments, the CUC, SUC and DUC were described as 'excellent'. The eUC was described as 'recommended' only at smaller injection distances.
APA, Harvard, Vancouver, ISO, and other styles
9

Cheng, Ching-Min, Shang-Pang Yu, and Tun-Ping Teng. "Fabrication and Characterization of Carbon-Based Nanofluids through the Water Vortex Trap Method." Journal of Nanomaterials 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/3264621.

Full text
Abstract:
This study designed an efficient one-step method for synthesizing carbon-based nanofluids (CBNFs). The method employs the vortex trap method (VTM) and an oxygen-acetylene flame, serving as a carbon source, in a manufacturing system of the VTM (MSVTM). The flow rate ratio of O2 and C2H2 was adjusted to form suitable combustion conditions for the reduced flame. Four flow rate ratios of O2 and C2H2 were used: 1.5 : 2.5 (V1), 1.0 : 2.5 (V2), 0.5 : 2.5 (V3), and 0 : 2.5 (V4). The morphology, structure, particle size, stability, and basic physicochemical characteristics of the obtained carbon-based nanomaterials (CBNMs) and CBNFs were investigated using transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, Raman spectrometry, ultraviolet–visible–near-infrared spectrophotometry, and a particle size-zeta potential analyzer. The static positioning method was utilized to evaluate the stability of the CBNFs with added EP dispersants. The evaluation results revealed the morphologies, compositions, and concentrations of the CBNFs obtained using various process parameters, and the relation between processing time and production rate was determined. Among the CBNMs synthesized, those obtained using the V4-0 flow rate ratio had the highest stability when no EP dispersant was added. Moreover, the maximum enhancement ratios of the viscosity and thermal conductivity were also obtained for V4-0: 4.65% and 1.29%, respectively. Different types and concentrations of dispersants should be considered in future research to enhance the stability of CBNFs for further application.
APA, Harvard, Vancouver, ISO, and other styles
10

Hagarová, Ingrid. "Cloud Point Extraction Used for Separation and Preconcentration of Trace Elements in Food Samples: A Review of Recent Applications." Journal of Food Engineering and Technology 10, no. 1 (June 15, 2021): 1–8. http://dx.doi.org/10.32732/jfet.2021.10.1.1.

Full text
Abstract:
Food safety analysis involves many subfields. One of them is inorganic analysis aimed to the quantification of various trace elements. The main attention in this field is paid to toxic, potentially toxic, and essential trace elements. However in many cases, direct quantification of trace elements in a complex food matrix is almost impossible. To resolve this problem, a combination of a suitable separation procedure with a reliable quantification method is required to deliver accurate results. One of the separation techniques that is currently receiving considerable attention is cloud point extraction (CPE). The use of optimized CPE procedures with commonly available spectrometric methods (e.g., UV-Vis spectrophotometry, flame atomic absorption spectrometry, electrothermal atomic absorption spectrometry, hydride generation atomic absorption spectrometry, cold vapor atomic absorption spectrometry, inductively coupled plasma optical emission spectrometry) provides the powerful tool for reliable quantification of many trace elements (e.g., Al, As, Cd, Cu, Hg, Pb, Mn, Ni, Sb, Se, Sn, Zn, and many others) in various types of food matrices (e.g., fresh vegetables, ground grain samples, canned food samples, various powdered food samples, and many others), as documented by studies included in this review.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Flame-emission spectrophotometry"

1

Medu, Erere Ohwofasa. "Examination of the antibacterial activities of some semi-synthetic chalcone-derivatives alone and in combination with polymyxin B." Thesis, Robert Gordon University, 2013. http://hdl.handle.net/10059/832.

Full text
Abstract:
In view of the increasing global challenge of bacterial resistance, there exists an urgent need for the rationale development of antibacterial compounds with either novel or multiple mechanisms of action. Two chalcone-derivatives, F1 and F23, demonstrated MICs within the range of 16 to >512 μg/ml against two plant pathogens (P. caratovoram and C. michiganensis subsp. michiganensis) as well as important clinical bacterial species. Both compounds displayed an MIC of 32 μg/ml against quinolone-resistant S. aureus. Whilst possessing weak activities individually, each semi-synthetic agent displayed notable synergistic action with polymyxin B against S. aureus, C. violaceum, E. coli and Ps. aeruginosa, thereby recording FICs within the range of <0.093 to 2 that indicated the existence of synergism in some instance. These chalcone compounds applied with polymyxin B displayed a notable FICindex of <0.093 against the Neisseriaceae C. violaceum, and a potential noteworthy capacity to extend the spectrum of activity of the latter antibiotic to include Gram-positive S. aureus species. F1 inhibited staphylococcal replication in broth and the combination of either of both chalcone-derivatives with polymyxin B instituted a metabolic blockage in S. aureus and other bacterial species as determined through a modified MTT reduction assay. The combined agents inflicted major disruptions to the S. aureus cytoplasmic membrane bilayer as evidenced by the release of intracellular potassium as well as the influx of Sytox Green fluorescent stain. Notable levels of cell membrane potential dissipation, leakage of intracellular potassium ions and blockage of reducing enzymes activities occurred within the first 30 minutes, well in advance of significant loss in cell viability that was recorded usually after 4 – 8 hours, suggesting these activities were prerequisites to cell death. In erythrocyte lysis assay, the synergistic combinations of 128 μg/ml of either of both chalcone derivatives with 128 μg/ml polymyxin B displayed the lowest degree of haemolysis, followed by that occurring with 32 μg/ml of the chalcone-derivatives combined with 256 μg/ml of the polypeptide antibiotic. In conclusion, further structure activity modifications aimed at improving the aqueous solubility of these chalcone-derivatives as well as the antibacterial activity recorded for certain combination concentrations of polymyxin B with either of these semi-synthetic agents may be required before considerations are made for the possibility for potential external formulations. Such preparations may include antiseptic creams, lotions, ointments, as well as aerosols that can be applied with nebulizers in targeted delivery for such cases like cystic fibrosis.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Flame-emission spectrophotometry"

1

Hanson, Dean, and Donald Horneck. "Determination Of Potassium And Sodium By Flame Emission Spectrophotometry." In Handbook of Reference Methods for Plant Analysis. CRC Press, 1997. http://dx.doi.org/10.1201/9781420049398.ch19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Flame-emission spectrophotometry' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography