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Journal articles on the topic 'Potentiometric evidences'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

S., S. Yadav, and S. Saxena R. "Formation constants and thermodynamic parameters of some tri-ligand complexes of lanthanides." Journal of Indian Chemical Society Vol. 86, Feb 2009 (2009): 168–70. https://doi.org/10.5281/zenodo.5807540.

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Department of Chemistry, Government Raza P.G College, Rampur-244 901, Uttar Pradesh, India <em>Manuscript received 30 June 2008, revised 15 October 2008, accepted 23 October 2008</em> Potentiometric evidences have been cited for the formation of 1 : 1 : 1 : 1; MLL'L<em>"</em> quaternary complexs [M<sup>III</sup> = La<sup>III</sup>, Pr<sup>III</sup> and Nd<sup>III</sup>, L = ethyleneglycol-bis(p-aminoethylether)-<em>N,N,N' ,N'</em>-tetraacetic acid (EGTA), L' = pyrldine-2,6-dicarboxylic acid (PDA) and L" = 2,2<em>'</em>-dithiodisalicylic acid (DTSA)

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2

Závada, Jiří, Václav Pechanec, Jaroslav Zajíček, Ivan Stibor, and Antonín Vítek. "Effects of salt concentration and counterion on stability of alkali ion-18-crown-6 complexes in aqueous and methanolic solution: A conflicting evidence from potentiometric and sodium-23 NMR studies." Collection of Czechoslovak Chemical Communications 50, no. 5 (1985): 1184–93. http://dx.doi.org/10.1135/cccc19851184.

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Contrary to expectation, the title effects observed concurrently by potentiometry with ion-selective electrode and by sodium-23 NMR spectroscopy are completely different. The potentiometric stability constants for the sodium ion-18-crown-6 complex (KISE) exhibit a very pronounced variation with the counterion, KISENaSCN > KISENaCl > KISENaOH, as well as with the sodium salt concentration, the KISENaSCN/KISENaOH ratio being about 1.5, 2.0, 5.0 and 20 in the 0.01, 0.1, 0.5 and 1.0 mol l-1 aqueous and about 2.0, 12, 600 and 2 500 in the 0.01, 0.1, 0.5 and 1.0 mol l-1 methanolic solution, re

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3

García, Begoña, Inmaculada Domingo, Pedro L. Domingo, and José M. Leal. "Determination of limiting molar conductivities of weak organic acids in aqueous solutions." Collection of Czechoslovak Chemical Communications 56, no. 6 (1991): 1184–92. http://dx.doi.org/10.1135/cccc19911184.

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Conductance, potentiometric, and spectrophotometric measurements have been made at 25°C of aqueous solution containing sulfanilic, hippuric, mandelic, and 3,5-dinitrosalicylic acids at different concentrations. Conductance data were analyzed using the methods of Fuoss-Kraus, Kraus-Parker, and Shedlovsky for conductivity of the free ions. Using the calculated limiting conductances, activity coefficients, and degrees of dissociation, the dissociation constants of the weak acids were determined. From plots Δ vs c1/2, reliable values for Δ0 were estimated, using a computer program, and by means of

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4

Powell, HKJ, and RM Town. "Aluminum(III)-Malonate Equilibria: a Potentiometric Study." Australian Journal of Chemistry 46, no. 5 (1993): 721. http://dx.doi.org/10.1071/ch9930721.

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The aluminium(III)-malonic acid (H2L) equilibria have been studied by potentiometric titration in aqueous solution at 25°C (I = 0.10 M KCl ). Data were consistent with the formation of simple binary complexes AlL + (log K1 = 6.711), AlL2- (log K2 = 4.815) and AlL33- (logβ3 = 14.104) in the pH range 2.2-5.5. There was also evidence for a minor species AlL2(OH)2- at pH > 5.8 for solutions with [Al3+]:[LH2] < 3.0 (log KD= -6.68). The protonation constants determined for malonic acid were log K1 = 5.43 and log K2 = 2.60 (corrected for K+ ion pairing).

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5

Baulin, V. E., G. S. Tsebrikova, D. V. Baulin, and Y. F. Al Ansary. "1,5-bis[2-(dioxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and its Analogs as Promising Organic Ligands for Copper(II) Binding s." Biomedical Chemistry: Research and Methods 1, no. 3 (2018): e00043. http://dx.doi.org/10.18097/bmcrm00043.

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The dissociation and complexation ability toward Cu(II) of acidic type phosphoryl-containing podands – tetrabasic 1,5-bis[2-(dioxyphosphoryl)-4-ethylphenoxy]-3-oxapentane (L1), dibasic – 1,5-bis[2-(ethoxyhydroxyphosphoryl)-4-ethylphenoxy]-pentane (L2) and also of their carboxylic analogue dibasic 1,5-bis[2-(oxycarbonylphenoxy)]-3-oxapentane (L3) were investigated by spectrophotometric, conductometric and potentiometric methods in water in the presence 5% of dimethyl formamide. Spectrophotometric and conductometric titration data provided evidence for formation of 1:1 (M:L) complexes. The disso

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6

Prasad, S., V. D. Leite, R. A. C. Santana, and E. A. Medeiros. "Electrometric studies on formation of cerium vanadates as a function of pH." Eclética Química 31, no. 2 (2006): 31–38. http://dx.doi.org/10.1590/s0100-46702006000200005.

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The precise nature of the reaction between nitric acid and sodium ortho-vanadate solutions has been studied by means of electrometric techniques involving potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves confirm the existence of the anions, pyro-V2O7(4-), meta-VO3- and poly-H2V10O28(4-) corresponding to the ratios of VO4(3-):H+ as 1:1, 1:2 and 1:2.6 in the neighborhood of pH 10.5, 7.4 and 3.6, respectively. The interaction of cerium(III) nitrate with sodium vanadate solutions, at specific pH levels 12.4, 10.5, 7.4 and 3.6 was also st

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7

Allard, Thierry, Marie Ponthieu, Tiphaine Weber, Naziano Filizola, Jean-Loup Guyot, and Marc Benedetti. "Nature and properties of suspended solids in the Amazon Basin." Bulletin de la Société Géologique de France 173, no. 1 (2002): 67–75. http://dx.doi.org/10.2113/173.1.67.

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Abstract Suspended solids from several rivers of the Amazon Basin (Brazil) have been studied in both the particulate (&gt; 0,2 μm) and colloidal (0.2 μm-5kD) fractions through a combination of tools including Fourier transform infrared spectroscopy (FT-IR), electron paramagnetic resonance (EPR) and potentiometric measurements. Particulate and colloidal matter are organo-mineral and organic, respectively. Signatures of the particulate fractions distinguish Rio Amazonas/Rio Solimoes rivers and the northern basin rivers (Rio Negro, Rio Branco, Rio Trombetas). In the latter, kaolinites are the

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8

Prasad, Saradh, Valderi Duarte Leite, Renato Alexandre Costa Santana, and Emanuelle Araújo De Medeiros. "Electrometric studies on formation of cerium vanadates as a function of pH." Ecletica Quimica 31, no. 2 (2006): 31–38. http://dx.doi.org/10.26850/1678-4618eqj.v31.2.2006.p31-38.

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The precise nature of the reaction between nitric acid and sodium ortho-vanadate solutionshas been studied by means of electrometric techniques involving potentiometric and conductometrictitrations. The well defined inflections and breaks in the titration curves confirm the existence of theanions, pyro-V 2 O 74- , meta-VO 3- and poly-H 2 V 10 O 284- corresponding to the ratios of VO 43- :H + as 1:1,1:2 and 1:2.6 in the neighborhood of pH 10.5, 7.4 and 3.6, respectively. The interaction of cerium(III)nitrate with sodium vanadate solutions, at specific pH levels 12.4, 10.5, 7.4 and 3.6 was also

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9

Matter, Hamdy, Tariq M. Ayad, and Abdulrhman A.I. Alkatly. "The Corrosion Inhibition of The Carbon Steel and Oil Pipelines in 1M HCl by Expired Lactulax and Triazepine Carboxylate Drugs." مجلة العلوم الاساسية و التطبيقية, no. 18 (July 23, 2024): 86–93. https://doi.org/10.36602/jsba.2024.18.86.

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Corrosion in carbon steel and oil pipelines has adverse economic and environmental effects. Therefore, there is interest in utilizing inexpensive and environmentally friendly materials to prevent and inhibit corrosion. In this study, two expired drugs, Lactulose (La.) and Triazepine Carboxylate (TC), were investigated as potential inhibitors of steel corrosion in 1M HCl. The weight loss method and the potentiometric method were employed to calculate the inhibition efficiency (IEw%) of these compounds. The study examined the effect of inhibitor concentration and temperature on IEw%, and also in

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10

Kovalchuk, Halyna, Oksana Lupak, Halyna Klepach, and Ihor Polyuzhyn. "POTENTIOMETRIC DETERMINATION OF THE ANTIOXIDANT ACTIVITY OF MEDICINAL PLANTS." Scientific Journal of Polonia University 35, no. 4 (2019): 102–9. http://dx.doi.org/10.23856/3512.

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The article deals with the analysis of the existing methods of investigating the antioxidant activity of plants’ origin and the expediency of measuring oxidation-reduction potential for this purpose.The integral AOA of alcohol extracts Urtica dioica, Trifolium pretense, Chelidonium majus, Hippophae rhamnoides has been determined by potentiometric method using the mediator system. It was established that the leaves of sea – buckthorn are characterised by the highest antioxidant activity (2.05 ± 0.1 mg AA / ml). The АОА of plants Urtica dioica, Chelidonium majus, that were growing along the tran

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11

Zabiszak, Michał, Justyna Frymark, Martyna Nowak, et al. "Influence of d-Electron Divalent Metal Ions in Complex Formation with L-Tartaric and L-Malic Acids." Molecules 26, no. 17 (2021): 5290. http://dx.doi.org/10.3390/molecules26175290.

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Binary complexes of α-hydroxy acids (L-Tartaric acid and L-Malic acid) with d-electron metal ions (copper, cobalt, nickel) were investigated. Potentiometric measurements have been performed in aqueous solution with computer analysis of the data for determination of the stability constants of complexes formed in the studied systems. The coordination mode of the complexes was defined using spectroscopic methods: electron paramagnetic resonance (EPR), ultraviolet-visible (UV-Vis), circular dichroism (CD), and infrared (IR). Results of the equilibrium studies have provided evidence for the formati

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12

Cappai, Rosita, Alessandra Fantasia, Guido Crisponi, Eugenio Garribba, M. Amélia Santos, and Valeria Marina Nurchi. "A Multi-Technique Investigation of the Complex Formation Equilibria between Bis-Deferiprone Derivatives and Oxidovanadium (IV)." Molecules 27, no. 5 (2022): 1555. http://dx.doi.org/10.3390/molecules27051555.

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The increasing biomedical interest in high-stability oxidovanadium(IV) complexes with hydroxypyridinone ligands leads us to investigate the complex formation equilibria of VIVO2+ ion with a tetradentate ligand, named KC21, which contains two 3-hydroxy-1,2-dimethylpyridin-4(1H)-one (deferiprone) moieties, and with the simple bidentate ligand that constitutes the basic unit of KC21, for comparison, named L5. These equilibrium studies were conducted with joined potentiometric–spectrophotometric titrations, and the results were substantiated with EPR measurements at variable pH values. This multi-

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13

G., N. Mukherjee, and K. Chakraborty P. "Metal complexes of some peptide derivatives. Part-XIV. Complex formation of copper(II) with N-benzenesulfonamides of some dipeptides." Journal of Indian Chemical Society Vol. 79, Feb 2002 (2002): 137–41. https://doi.org/10.5281/zenodo.5846040.

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Department of Chemistry, University of Calcutta, University College of Science, 92 Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail: gurunath@cucc.ernet.in           Fax: 91-033-3519755/2413222</em> Bengal Chemical and Pharmaceutical Works, Kolkata-700 009, India <em>Manuscript received 11 August 2000, revised 13 July 2001, accepted 14 July 2001</em> Combined potentiometric and spectrophotometric investigation on the complex formation equilibria of Cu<sup>ll</sup> with <em>N</em>-benzenesulfonyl derivatives of some dipeptides, viz. glycylglycine, g

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14

Prasad, S., R. A. C. Santana, A. R. N. Campos, and V. D. Leite. "Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates." Eclética Química 32, no. 1 (2007): 71–78. http://dx.doi.org/10.1590/s0100-46702007000100010.

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The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate (< 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves provide evidence for the existence of the polyanions, para-W12O41(10-) and meta-W12O39(6-) corresponding to the ratio of H+:WO4(2-) as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction of lanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was also s

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15

Gyurcsányi, Robert E., Éva Pergel, Renáta Nagy, et al. "Direct Evidence of Ionic Fluxes Across Ion-Selective Membranes: A Scanning Electrochemical Microscopic and Potentiometric Study." Analytical Chemistry 73, no. 9 (2001): 2104–11. http://dx.doi.org/10.1021/ac000922k.

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16

Závada, Jiří, Juraj Koudelka, Petr Holý, Martin Bělohradský, and Ivan Stibor. "Bis(monoazacrown ethers) with an electron-donating substituent at the hinge: A pronounced participation of hydroxyl group in formation of sodium ion sandwich complexes." Collection of Czechoslovak Chemical Communications 54, no. 4 (1989): 1043–54. http://dx.doi.org/10.1135/cccc19891043.

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Sodium ion complex formation has been investigated potentiometrically in four homologous bis(crown) series I-IV differing by the nature of substituent placed at the linking trimethylene chain (X = OH, OCH3, OCH2C6H5 and H respectively). A marked enhancement of the complex stability has been observed in the bis(crown) series I and attributed to participation of the lateral hydroxyl group in the sandwich complex formation. Evidence in support of the sandwich structure has been provided (i) by analysis of the potentiometric data indicating a 1:1 complex stoichiometry and (ii) by a comparison of t

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17

Slagter, Silvina, Lidya G. Tarhan, Weiduo Hao, Noah J. Planavsky, and Kurt O. Konhauser. "Experimental evidence supports early silica cementation of the Ediacara Biota." Geology 49, no. 1 (2020): 51–55. http://dx.doi.org/10.1130/g47919.1.

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Abstract Casts and molds of soft-bodied organisms in Ediacaran sandstones (“Ediacara-style” fossilization) have played an important role in reconstruction of the emergence and radiation of early complex macroscopic life. However, the preservational processes responsible for the Ediacara fossil record are still vigorously debated. Whereas classic studies proposed fossilization via rapid sulfide mineralization of carcass and matground surfaces, a more recent view posits silica as the key mineral involved in their preservation. We performed experiments in which a variety of soft-bodied organisms

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18

Salerno, John C., Barbara Bolgiano, and W. John Ingledew. "Potentiometric titration of cytochrome-botype quinol oxidase ofEscherichia coli: Evidence for heme-heme and copper-heme interaction." FEBS Letters 247, no. 1 (1989): 101–5. http://dx.doi.org/10.1016/0014-5793(89)81249-9.

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19

Bataille, M. "Spectroscopic and potentiometric evidence for the stabilization of a bent structure of octapeptides by Cu(II) ions." Journal of Inorganic Biochemistry 24, no. 3 (1985): 211–21. http://dx.doi.org/10.1016/0162-0134(85)85004-2.

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20

Manek, Enikő, Etelka Tombácz, Erik Geissler, and Krisztina László. "Search for the Origin of Discrepancies in Osmotic Measurements of the PNIPAM - Water System." Periodica Polytechnica Chemical Engineering 61, no. 1 (2017): 39. http://dx.doi.org/10.3311/ppch.10273.

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Major, still unelucidated, inconsistencies exist in the literature among measurements of the thermodynamic properties of poly(N-isopropylacrylamide) (PNIPAM) solutions and gels. This paper looks for evidence of intrinsic ionic behaviour in cross-linked PNIPAM homopolymer hydrogels synthesized in water under standard conditions. Systematic measurements are made of the swelling and osmotic properties of lightly cross-linked PNIPAM hydrogels, as well as of their potentiometric titration and DSC response, over a wide range of pH and ionic strength conditions, in order to distinguish the effects of

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21

Khun, K., Z. H. Ibupoto, O. Nur, and M. Willander. "Development of Galactose Biosensor Based on Functionalized ZnO Nanorods with Galactose Oxidase." Journal of Sensors 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/696247.

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The fabrication of galactose biosensor based on functionalised ZnO nanorods is described. The galactose biosensor was developed by immobilizing galactose oxidase on ZnO nanorods in conjunction with glutaraldehyde as a cross-linker molecule. The IRAS study provided evidence for the interaction of galactose oxidase with the surface of ZnO nanorods. The electromotive force (EMF) response of the galactose biosensor was measured by potentiometric method. We observed that the proposed biosensor has a linear detection range over a concentration range from 10 mM to 200 mM with good sensitivity of89.10

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Máriássy, Michal, Zuzana Hankova, and Kyungmin Jo. "CCQM-K173.1 - Assay of sodium carbonate. Final report." Metrologia 61, no. 1A (2024): 08015. http://dx.doi.org/10.1088/0026-1394/61/1a/08015.

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Main text The CCQM key comparison CCQM-K173.1 is a subsequent comparison to CCQM-K173. It was performed to demonstrate the capability of KRISS to measure the amount content of bases. The institutes could use a method of their choice, although the use of coulometry or titrimetry with potentiometric determination of the endpoint was expected. The result of SMU was used as a link to the original comparison CCQM-K173. The results of KRISS were in good agreement with the reference value and may serve as evidence to support respective CMC claims. To reach the main text of this paper, click on Final

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Jo, Kyungmin, Min-Ah Oh, Alena Sobina, and Alexandr Shimolin. "Final report of CCQM-K96.2023.1: assay of potassium dichromate." Metrologia 62, no. 1A (2025): 08020. https://doi.org/10.1088/0026-1394/62/1a/08020.

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Main text The CCQM key comparison CCQM-K96.2023.1, a subsequent comparison to CCQM-K96.2023, was conducted to demonstrate the capability of VNIIM-UNIIM to measure the amount content of oxidants. KRISS served as the coordinating laboratory, with its results linking to the original comparison. Participating institutes may use a method of their choice, but coulometry with potentiometric or amperometric endpoint determination is expected to be used in most cases. The results from VNIIM-UNIIM were in good agreement with the reference value, providing evidence to support the respective CMC claims. T

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GRANT, DAVID, WILLIAM F. LONG, and FRANK B. WILLIAMSON. "Evidence from potentiometric titration for lack of reversibility in the interaction between heparin and Cu2+ or Ca2+ ions." Biochemical Society Transactions 20, no. 4 (1992): 362S. http://dx.doi.org/10.1042/bst020362s.

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Faraji, Mohammad, Ali Farajtabar, and Farrokh Gharib. "Ionic strength effect on deprotonation of para-sulfonatocalix[4]arene." Journal of the Serbian Chemical Society 78, no. 5 (2013): 681–88. http://dx.doi.org/10.2298/jsc120706110f.

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The deprotonation of para-sulfonatocalix[4]arene were studied by a combination of spectrophotometric and potentiometric methods at 25?C. The ionic strength of solutions was kept constant by sodium perchlorate as background electrolyte at 0.10 to 4.0 mol dm-3. Potentiometer was calibrated according to Gran method for each ionic strength. Spectral changes show evidence for proton dissociation of only one hydroxyl group of calixarene in the studied pH range of 2-10. The pKa values were calculated using STAR program by multivariate curve resolution of absorbance data. Results indicate that the aci

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26

Sajewicz, Mieczyslaw, and Teresa Kowalska. "Liquid Chromatographic Investigation of Spontaneous Oscillatory In Vitro Chiral Conversion and Spontaneous Oscillatory Condensation of Simple Carboxylic Acids in Aqueous and Nonaqueous Media." Chromatography Research International 2011 (December 1, 2011): 1–11. http://dx.doi.org/10.4061/2011/957508.

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Oscillatory reactions are a narrow reaction type among the entity of chemical reactions and those involving purely organic compounds make a small contribution to an overall number of all known oscillatory reactions. The most abundant type is purely inorganic and mixed inorganic-organic oxidation-reduction reactions, basically because monitoring them is relatively easy (e.g., with use of potentiometric measurements). Investigation of the organic reactions can be more demanding, and then chromatography is an analytical technique of choice. In this paper, we provide an overview of chromatographic

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27

Alnuwaiser, Maha Abdallah, and Mohamed Rabia. "A Highly Promising Flower-Shaped WO2I2/Poly(1H-Pyrrole) Nanocomposite Thin Film as a Potentiometric Sensor for the Detection of Cd2+ Ions in Water." Journal of Composites Science 7, no. 10 (2023): 439. http://dx.doi.org/10.3390/jcs7100439.

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Because of the expensive nature of sensors used to detect heavy metals and the severe health risks associated with certain heavy metals, there is a pressing need to develop cost-effective materials that are highly efficient in detecting these metals. A flower-shaped WO2I2-Poly(1H-pyrrole) (WO2I2/P1HP) nanocomposite thin film is synthesized through the oxidation of 1-H pyrrole using iodine and subsequent reaction with Na2WO4. The nanocomposite exhibits a distinctive flower-like morphology with an average size of 20 nm. Elemental composition and chemical structure are confirmed via X-ray photoel

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28

Shpoliansky, M., and B. Kamath. "A218 A CASE REPORT OF PSEUDOHYPONATREMIA IN CHOLESTATIC LIVER DISEASE." Journal of the Canadian Association of Gastroenterology 4, Supplement_1 (2021): 250–52. http://dx.doi.org/10.1093/jcag/gwab002.216.

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Abstract Background True hyponatremia in the setting of cholestatic liver disease may signify cirrhosis with fluid overload, and is therefore an ominous sign of deteriorating liver function. In pediatric liver transplant candidates, it is associated with increased waitlist mortality. Pseudohyponatremia however, is a falsely low measurement of plasma sodium when measured by indirect potentiometry. Pseudohyponatremia secondary to hypercholesterolemia is a phenomenon that occurs due to a reduced aqueous fraction of the plasma when levels of cholesterol or triglycerides are greatly elevated. Sever

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Jancsó, Attila, László Nagy, Erlend Moldrheim, and Einar Sletten. "Potentiometric and spectroscopic evidence for co-ordination of dimethyltin(IV) to phosphate groups of DNA fragments and related ligands." Journal of the Chemical Society, Dalton Transactions, no. 10 (1999): 1587–94. http://dx.doi.org/10.1039/a901322i.

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Prasad, Saradh, Renato Alexandre Costa De Santana, Ana Regina Nascimento Campos, and Valderi Duarte Leite. "Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates." Ecletica Quimica 32, no. 1 (2007): 71–78. http://dx.doi.org/10.26850/1678-4618eqj.v32.1.2007.p71-78.

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The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate(≤ 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric andconductometric titrations. The well defined inflections and breaks in the titration curves provideevidence for the existence of the polyanions, para-W 12 O 4110- and meta-W 12 O 396- corresponding to theratio of H + :WO 42- as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction oflanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was alsostudied

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31

Drobota, Mioara, Zdenka Persin, Lidija Zemljic, et al. "Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization." Open Chemistry 11, no. 11 (2013): 1786–98. http://dx.doi.org/10.2478/s11532-013-0319-z.

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AbstractThe functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a “sandwich model”. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative determination of the introduced amine groups were examined by means of Fourier Transform Infrared Attenuated Total Reflexion (FTIR — ATR), X-ray photoelectron spectroscopy (XPS), and poten

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32

(Miss), SUJATA KHANNA, ALKA PRADHAN (Miss), and K. CHATURVEDI G. "Potentiometric Studies on the Formation of Quaternary Mixed Ligand Complexes of Some Transition Metal Ions." Journal of Indian Chemical Society Vol. 61, Apr 1984 (1989): 302–5. https://doi.org/10.5281/zenodo.6319615.

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Chemical Laboratories, Agra College, Agra-282 002 <em>Manuscript received 10 April 1983, revised 21 November 1983, accepted 13 February 1984</em> The formation of mixed ligand complexes of the type MABC, where M(ll) = Cu(II), Ni(ll) or Zn(ll), A=iminodiacetic acid (IMDA), B=malonic acid (maln) and C= ethylenediamine (en) or 1,2- propanediamine (pn) have been investigated by _<em>p</em>H metric titrations. Evidence is provided for the simultaneous addition of primary ligand (A) and secondary ligand (B) to the metal ion resulting in the formation of an intermediate ternary species, MAD, to

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33

G., N. Mukherjee, Das Ansuman, and Bandyopadhyay Susmita. "Complex formation equilibria of Felll with boric acid in presence of some aminopolycarboxylic acids." Journal of Indian Chemical Society Vol. 81, Apr 2004 (2004): 282–86. https://doi.org/10.5281/zenodo.5830682.

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Department of Chemistry, University of Calcutta, University College of Science, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail </em>: gmchem@rediffmail.com          <em> Fax</em> : 91-33-23519755 <em>Manuscript received 7 January 2003, accepted 14 October 2003</em> Equilibrium study on the mixed ligand complex formation of Fe<sup>III</sup> with nitrilotriacetic acid and anthranilic acid diacetic acid (H<sub>3</sub>L) in the absence and in the presence of boric acid in different molar ratios provide the evidence of formation of Fe(L) Fe(O

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34

ROHITASHVA, M. TRIPATHI, RANJANA GHOSE (Mrs.), and K. GHOSE ANIMESH. "Interaction of N-[Tris(hydroxymethyl)methyl]glycine with some Transition Metal Complexes in Aqueous Solution." Journal of Indian Chemical Society Vol. 64, Sep 1987 (1987): 519–20. https://doi.org/10.5281/zenodo.6218482.

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Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi-221 005 <em>Manuscript received 19 September 1986, revised 17 July 1987, accepted 17 August 1987</em> Equilibrium study of the reaction between Cu<em><sup>II</sup>, </em>Ni<em><sup>II</sup>, C</em>o<em><sup>II</sup></em>, Zn<em><sup>II</sup></em>, Cd<em><sup>II</sup></em> or Pb<em><sup>II </sup></em>with 1,10-phenanthroline (phen) and <em>N-</em>[tris(hydroxymethl)glycine (H<sub>3</sub>L) by potentiometric titration technique in aqueous solution at 30° and at an ionic strength 0.01 <em>M</em> (KNO<sub

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35

G., N. MUKHERJEE, and S. SARKAR (Miss). "Metal Complexes of some Model Peptide Derivatives. Part-VII. Equilibrium Study of the Interaction of lron(III) with N-Salicyloylglycine and Phosphoric Acid in Binary and Ternary Systems." Journal of Indian Chemical Society Vol. 64, Nov 1987 (1987): 660–64. https://doi.org/10.5281/zenodo.6221609.

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Department of Chemistry, University College of Science, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 <em>Manuscript received </em>27 April <em>1987, revised 13 October 1987, accepted 30 October 1987</em> Combined potentiometric pH-titration and spectrophotometric study on the interaction of Fe<sup>III</sup> with  <em>N</em>-salicyloylglycine, <em>o</em>-HO - C<sub>2</sub>H<sub>4</sub>CONHCH<sub>2</sub>COOH and phosphoric acid in binary and ternary systems provided the evidence of formation of varieties of complexes. The ligand provided bidentate (\(\bar{O}\)

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Furimsky, M., T. W. Moon, and S. F. Perry. "Evidence for the role of a Na(+)/HCO(3)(−) cotransporter in trout hepatocyte pHi regulation." Journal of Experimental Biology 203, no. 14 (2000): 2201–8. http://dx.doi.org/10.1242/jeb.203.14.2201.

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The mechanisms of intracellular pH (pHi) regulation were examined in hepatocytes of the rainbow trout Oncorhynchus mykiss. pHi was monitored using the pH-sensitive fluorescent dye BCECF, and the effects of various media and pharmacological agents were examined for their influence on baseline pHi and recovery rates from acid and base loading. Rates of Na(+) uptake were measured using (22)Na, and changes in membrane potential were examined using the potentiometric fluorescent dye Oxonol VI. The rate of proton extrusion following acid loading was diminished by the blockade of either Na(+)/H(+) ex

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Bilal, B. A., and E. Müller. "Potentiometrie Study of Magnesium Fluoro Complexes in Aqueous Solutions up to 473 K and 1 kbar." Zeitschrift für Naturforschung A 47, no. 10 (1992): 1034–38. http://dx.doi.org/10.1515/zna-1992-1005.

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AbstractThe formation of magnesium fluoro complexes in a hydrothermal fluorite-bearing model solution has been potentiometrically studied up to 473 K and 1 kbar at the ionic strength I = 1 m (NaCl), in order to estimate the competition with the formation of the lanthanide fluoro and fluorohydroxo complexes in such systems. No evidence of difluoro complex was found at p, T, [F- ] and pH conditions which are relevant to fluorite formation. The apparent formation constant Q, as well as the apparent thermodynamic data ΔG, ΔS and ΔH of MgF+ have been determined. The effect of pressure was found to

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Savastano, Matteo, Celeste García-Gallarín, Claudia Giorgi, et al. "Solid State and Solution Study on the Formation of Inorganic Anion Complexes with a Series of Tetrazine-Based Ligands." Molecules 24, no. 12 (2019): 2247. http://dx.doi.org/10.3390/molecules24122247.

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Four molecules (L1–L4) constituted by an s-tetrazine ring appended with two identical aliphatic chains of increasing length bearing terminal morpholine groups were studied as anion receptors in water. The basicity properties of these molecules were also investigated. Speciation of the anion complexes formed in solution and determination of their stability constants were performed by means of potentiometric (pH-metric) titrations, while further information was obtained by NMR and isothermal titration calorimetry (ITC) measurements. The crystal structures of two neutral ligands (L3, L4) and of t

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Cuchinski, Ariela Suzan, Josiane Caetano, and Douglas Cardoso Dragunski. "EXTRAÇÃO DO CORANTE DA BETERRABA (BETA VULGARIS) PARA UTILIZAÇÃO COMO INDICADOR ÁCIDO-BASE." Eclética Química Journal 35, no. 4 (2018): 17. http://dx.doi.org/10.26850/1678-4618eqj.v35.4.2010.p17-23.

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In this study, we investigated the behavior of aqueous and alcoholic extract of sugar beet (Beta vulgaris) as an acid-base indicator, having as main objective the awakening interest in the use of natural indicators as an alternative to teaching of concepts of titration, equilibrium chemical and the law of Lambert-Beer. For the experiments we used standard solutions of hydrochloric acid (HCl), acetic acid and sodium hydroxide (NaOH). Initially tests were performed to evaluate and reversibility of the system, and it was observed that the color changes from red to yellow with the addition of base

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Kuznetsov, Andrey V., Oleg Mayboroda, Dagmar Kunz, Kirstin Winkler, Walter Schubert, and Wolfram S. Kunz. "Functional Imaging of Mitochondria in Saponin-permeabilized Mice Muscle Fibers." Journal of Cell Biology 140, no. 5 (1998): 1091–99. http://dx.doi.org/10.1083/jcb.140.5.1091.

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Confocal laser-scanning and digital fluorescence imaging microscopy were used to quantify the mitochondrial autofluorescence changes of NAD(P)H and flavoproteins in unfixed saponin-permeabilized myofibers from mice quadriceps muscle tissue. Addition of mitochondrial substrates, ADP, or cyanide led to redox state changes of the mitochondrial NAD system. These changes were detected by ratio imaging of the autofluorescence intensities of fluorescent flavoproteins and NAD(P)H, showing inverse fluorescence behavior. The flavoprotein signal was colocalized with the potentiometric mitochondria-specif

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Best, WM, JM Harrowfield, TM Shand, and RV Stick. "Aluminum(III) Coordination to Hydroxy Carboxylates: the Influence of Hydroxy Substituents Enabling Tridentate Binding." Australian Journal of Chemistry 47, no. 11 (1994): 2023. http://dx.doi.org/10.1071/ch9942023.

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Potentiometric evalution of the interaction between aluminium(III) and the hydroxy carboxylates 3-deoxy-D-ribo-hexonate (L1H) and 2,5-dihydroxypentanoate (L2H) provided evidence for the formation of 1:1 complexes only, though with the ligand being present in singly, doubly and quadruply deprotonated forms in the hexonate complexes, and in singly, doubly and triply deprotonated forms in those of the pentanoate. At 298 K in aqueous media, I = 0.1 ( NaCl ), equilibrium quotient values obtained through use of the programs PKAS and BEST were: -log([(L1)-][H+]/[L1H])(or pKa(L1H))= 3.58�0.03 log([(Al

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G., N. Mukherjee, and K. Sahu H. "Multimetal multiligand complexes. Part-II. Equilibrium study on the formation and stability of mixed-metal, mixed-ligand complexes of cobalt-, nickel-, copper- and zinc(II) with aspartate and benzimidazole in aqueous solution." Journal of Indian Chemical Society Vol. 77, Apr 2000 (2000): 209–12. https://doi.org/10.5281/zenodo.5867045.

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Department of Chemistry, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta-700 009, India <em>Manuscript received 1 June 1999, revised 4 October 1999, accepted 27 October 1999</em> Potentiometric study of ternary and quaternary mixtures consisting of M<sup>2+</sup> ions (M = M<sup>1</sup>, M<sup>2</sup> = Co, Ni, Cu and Zn), aspartate (A<sup>2-</sup>) and benzimidazole (<strong>B</strong>) as ligands provides evidence of formation of homo- and heterobinuclear complexes: M<sub>2</sub>(A)<sub>2</sub>B, M<sub>2</sub>(A)<sub>2</sub>(B-H)<strong>,</strong> M<sup>1</sup>M<sup>2</sup

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Malaika, Anna, Jolanta Kowalska-Kuś, Klaudia Końska, et al. "Upgrading Pyrolytic Residue from End-of-Life Tires to Efficient Heterogeneous Catalysts for the Conversion of Glycerol to Acetins." Molecules 28, no. 24 (2023): 8137. http://dx.doi.org/10.3390/molecules28248137.

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Recovered carbon blacks (rCBs) produced from end-of-life tires using pyrolysis were transformed into solid acid catalysts for the synthesis of acetins, i.e., products with a wide spectrum of practical applications. Tuning the chemical properties of the surface of samples and introducing specific functional groups on the rCBs were achieved through carbon functionalization with concentrated H2SO4. The initial and modified rCBs were thoroughly characterized using techniques such as elemental analysis, potentiometric back titration, thermogravimetric technique, scanning and transmission microscopy

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Barišić, Antun, Johannes Lützenkirchen, Nikol Bebić, et al. "Experimental Data Contributing to the Elusive Surface Charge of Inert Materials in Contact with Aqueous Media." Colloids and Interfaces 5, no. 1 (2021): 6. http://dx.doi.org/10.3390/colloids5010006.

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We studied the charging of inert surfaces (polytetrafluoroethylene, i.e., PTFE; graphite; graphene; and hydrophobic silica) using classical colloid chemistry approaches. Potentiometric titrations showed that these surfaces acquired less charge from proton-related reactions than oxide minerals. The data from batch-type titrations for PTFE powder did not show an effect of ionic strength, which was also in contrast with results for classical colloids. In agreement with classical colloids, the electrokinetic results for inert surfaces showed the typical salt level dependence. In some cases, the po

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Waugh, Declan T., Michael Godfrey, Hardy Limeback, and William Potter. "Black Tea Source, Production, and Consumption: Assessment of Health Risks of Fluoride Intake in New Zealand." Journal of Environmental and Public Health 2017 (2017): 1–27. http://dx.doi.org/10.1155/2017/5120504.

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In countries with fluoridation of public water, it is imperative to determine other dietary sources of fluoride intake to reduce the public health risk of chronic exposure. New Zealand has one of the highest per capita consumption rates of black tea internationally and is one of the few countries to artificially fluoridate public water; yet no information is available to consumers on the fluoride levels in tea products. In this study, we determined the contribution of black tea as a source of dietary fluoride intake by measuring the fluoride content in 18 brands of commercially available produ

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Guedens, Wanda, Monique Reynders, Koen Van Vinckenroye, Jan Yperman, and Robert Carleer. "Monitoring the Chloride Concentration in International Scheldt River Basin District Water Using a Low-Cost Multifunction Data Acquisition Board." Water 10, no. 8 (2018): 1025. http://dx.doi.org/10.3390/w10081025.

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In analytical chemistry laboratories, to gather in the shortest time as many data as possible with the utmost accuracy and precision, high throughput automated setups are indispensable. In the present study, to determine the chloride concentration in the international Scheldt river basin district, experiments are carried out utilizing a thermostatically controlled semi-automated setup. A novel ICT-based method is developed using a low-cost multifunction Data Acquisition Board (DAQ) controlled by a homebuilt LabVIEW™ program. Specifically, this approach enables a correlation between different p

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Inclán, Mario, María Teresa Albelda, Salvador Blasco, et al. "Mn(II) Complexes of Enlarged Scorpiand-Type Azamacrocycles as Mimetics of MnSOD Enzyme." Applied Sciences 12, no. 5 (2022): 2447. http://dx.doi.org/10.3390/app12052447.

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Living organisms depend on superoxide dismutase (SOD) enzymes to shield themselves from the deleterious effects of superoxide radical. In humans, alterations of these protective mechanisms have been linked to the pathogenesis of many diseases. However, the therapeutic use of the native enzyme is hindered by, among other things, its high molecular size, low stability, and immunogenicity. For this reason, synthetic SOD mimetic compounds of low molecular weight may have therapeutic potential. We present here three low-molecular-weight compounds, whose Mn2+ complexes can mimic, at least partially,

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Gopalakrishnan, Veerasamy, Subramanian Iyyam Pillai, and Sorimuthu Pillai Subramanian. "Synthesis, Spectral Characterization, and Biochemical Evaluation of Antidiabetic Properties of a New Zinc-Diosmin Complex Studied in High Fat Diet Fed-Low Dose Streptozotocin Induced Experimental Type 2 Diabetes in Rats." Biochemistry Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/350829.

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In view of the established antidiabetic properties of zinc, the present study was aimed at evaluating the hypoglycemic properties of a new zinc-diosmin complex in high fat diet fed-low dose streptozotocin induced experimental type 2 diabetes in rats. Zinc-diosmin complex was synthesized and characterized by various spectral studies. The complexation between zinc ions and diosmin was further evidenced by pH-potentiometric titrations and Job’s plot. Diabetic rats were orally treated with zinc-diosmin complex at a concentration of 20 mg/kg b.w./rat/day for 30 days. At the end of the experimental

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Bacchetti, Francesca, Anna Maria Schito, Marco Milanese, Sara Castellaro, and Silvana Alfei. "Anti Gram-Positive Bacteria Activity of Synthetic Quaternary Ammonium Lipid and Its Precursor Phosphonium Salt." International Journal of Molecular Sciences 25, no. 5 (2024): 2761. http://dx.doi.org/10.3390/ijms25052761.

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Organic ammonium and phosphonium salts exert excellent antimicrobial effects by interacting lethally with bacterial membranes. Particularly, quaternary ammonium lipids have demonstrated efficiency both as gene vectors and antibacterial agents. Here, aiming at finding new antibacterial devices belonging to both classes, we prepared a water-soluble quaternary ammonium lipid (6) and a phosphonium salt (1) by designing a synthetic path where 1 would be an intermediate to achieve 6. All synthesized compounds were characterized by Fourier-transform infrared spectroscopy and Nuclear Magnetic Resonanc

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Brinza, Loredana. "Surface Coverage Simulation and 3D Plotting of Main Process Parameters for Molybdenum and Vanadium Adsorption onto Ferrihydrite." Nanomaterials 12, no. 3 (2022): 304. http://dx.doi.org/10.3390/nano12030304.

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Ferrihydrite, FHY, was synthesized and characterized for morphology, mineralogy, surface area, hydrodynamic diameter and surface charge properties before molybdenum (Mo) and vanadium (V) adsorption. The potentiometric titration results showed first direct evidence that CO2 affects FHY surface sites at pH 6–9. Beside CO2, particles concentration may affect surface properties with an impact on adsorption performance. Additional new adsorption simulation results on theoretical surface coverage vs. experimental results obtained at varying particles concentration help theoreticians and experimental

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