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Journal articles on the topic 'Potentiometric titrations'

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Published: 4 June 2021
Last updated: 29 January 2023

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1

Braun, R. D. "Potentiometry and potentiometric titrations." TrAC Trends in Analytical Chemistry 4, no. 5 (May 1985): xxi. http://dx.doi.org/10.1016/0165-9936(85)87014-x.

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2

Gibson, Graham, Alexei A. Neverov, and R. S. Brown. "Potentiometric titration of metal ions in methanol." Canadian Journal of Chemistry 81, no. 6 (June 1, 2003): 495–504. http://dx.doi.org/10.1139/v03-035.

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The potentiometric titrations of nine lanthanideIII triflates, ZnII and CuII triflate, and the NiII, CoII, MgII, and TiIV perchlorates were obtained in methanol to determine the titration constants (defined as the sspH at which the [OCH3–]/[Mx+]t ratios are 0.5 and 1.5) as well as the apparent sspKa values for deprotonation of the metal-bound solvent molecules. The titrations were performed under various conditions with and without added salts as electrolytes, and the variations in the titration constants are discussed. In selected cases (La3+, Zn2+) the titration profiles were analyzed using a complex fitting program to obtain information about the species present in solution.Key words: potentiometric titration, methanol, sspH, metal ion, lanthanides, apparent sspKa.
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3

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 studied by potentiometric and conductometric titrations between the reactants. The end-points obtained from the sharp inflections in the titration curves provide definite evidence for the formation and precipitation of cerium ortho-Ce2O3.V2O5, pyro-2Ce2O3.3V2O5 and meta-Ce2O3.3V2O5 vanadates in the neighborhood of pH 7.4, 6.2 and 4.8, respectively. Analytical investigations on the precipitates formed confirm the results of the electrometric study.
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4

Besenhard, J. O., H. P. Gansmann, and H. Meyer. "Bestimmung von Oberflächenoxiden auf Rußen durch potentiometrische Direkttitration in nichtwäßrigen Lösungsmitteln / Determination of Surface Oxides on Carbon Blacks by Direct Potentiometric Titration in Non-Aqueous Solvents." Zeitschrift für Naturforschung B 45, no. 6 (June 1, 1990): 857–63. http://dx.doi.org/10.1515/znb-1990-0617.

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An attempt is made to quantitatively determine acidic and basic surface oxides on carbon blacks and also to monitor their acid and base strength distribution by direct potentiometric titrations in non-aqueous media.In contrast to direct titration procedures proposed so far, our method allows to distinguish clearly between several types of acidic surface oxides of different acid strength. This is mainly achieved by improvements of the non-aqueous titration media. The total contents of weakly and strongly acidic and also of basic oxides determined by this very fast method is comparable to results obtained by slow and laborious indirect titrations.
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5

Qayoom, Amtul, Syed Arif Kazmi, and Saeeda Nadir Ali. "Turmeric Powder as a Natural Heavy Metal Chelating Agent: Surface Characterisation." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 60, no. 1 (February 28, 2017): 1–8. http://dx.doi.org/10.52763/pjsir.phys.sci.60.1.2017.1.8.

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The present study was conducted to investigate surface properties of turmeric in order to evaluateits detoxification potential and ability to sequester toxic metals ions. Scanning Electron Microscopy (SEM),Energy Dispersion Spectroscopy (EDS), Infra-Red (IR) spectroscopy and potentiometric titrations wereemployed for characterisation of the surface of turmeric powder. Spectroscopic studies revealed that thesurface of turmeric powder was porous mainly composed of polymeric -OH , -NH , -CH2 , -COO and-OH groups of polysaccharides. From potentiometric titrations and modelling of batch titration data, it wasfound that surface of the turmeric contains at least four binding sites with pKa values 3.56 (pK1), 4.83(pK2), 7.68 (pK3) and 10.4 (pK4). Turmeric powder contains highest concentration of amino and hydroxylgroups for the pK4 values i.e., 0.55 mmol/ g. The total binding sites concentration for turmeric powderwas 1.2 mmol/ g.
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6

Gran, Gunnar. "Equivalence volumes in potentiometric titrations." Analytica Chimica Acta 206 (1988): 111–23. http://dx.doi.org/10.1016/s0003-2670(00)80835-1.

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7

Basavaraja, C., and V. R. Kulkarni. "Volume effects in potentiometric titrations." Resonance 9, no. 1 (January 2004): 82–85. http://dx.doi.org/10.1007/bf02902531.

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8

Mustafa, S., A. Naeem, N. Rehana, and H. Y. Samad. "Cation-Exchange Properties of Aluminium(III) Phosphate." Adsorption Science & Technology 13, no. 4 (August 1996): 261–79. http://dx.doi.org/10.1177/026361749601300404.

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Potentiometric titrations of aluminium(III) phosphate have been performed in the presence of aqueous electrolyte solutions containing Cu2+, Zn2+, Ni2+ and K+ ions as a function of the concentration of the latter, the pH and the temperature. The sorption of Zn2+ ions has also been studied and the data for metal ion sorption shown to correlate with the Potentiometric titration data, indicating that the process responsible for metal ion uptake is ion exchange. The pKa value of the exchanger and its thermodynamic parameters have been evaluated.
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9

Gündüz, Turgut, Esma Kiliç, Güleren Özkan, Muhammed F. Awaad, and Mustafa Tastekin. "Conductimetric and potentiometric investigation of effect of acidity on formation of homoconjugates in acetonitrile solvent." Canadian Journal of Chemistry 68, no. 5 (May 1, 1990): 674–78. http://dx.doi.org/10.1139/v90-103.

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In the present work, 11 aromatic and nine aliphatic carboxylic acids, namely benzoic, 2-nitrobenzoic, 3-nitrobenzoic, 4-nitrobenzoic, 2,4-dinitrobenzoic, 3,5-dinitrobenzoic, 2-aminobenzoic, 3-aminobenzoic, 4-aminobenzoic, o-phthalic, salicylic, formic, acetic, monochloroacetic, dichloroacetic, trichloroacetic, propionic, n-butyric, caprylic, and myristic acids, were titrated conductimetrically and potentiometrically with triethylamine in acetonitrile solvent, under a nitrogen atmosphere, at 25 °C. Closer investigation of the conductimetric titration curves of these acids showed that the acidity of an acid, rather than the basicity of its conjugate base, plays a major part in the formation of homoconjugate ions, at least in acetonitrile solvent. If the acid is strong enough, there is a maximum before the experimental end point at about the half-neutralization point. To determine the minimum strength for an acid to show this maximum before the end point, all acids were also titrated potentiometrically. It was found that those acids which have half-neutralization potentials over −85 mV give a strong homoconjugation reaction and show a maximum before the experimental end point. Moreover, the acids that show maxima before the experimental end point in the conductimetric titration also show rather well-shaped potentiometric titration curves. Keywords: nonaqueous media, conductimetric titrations, potentiometric titrations, titration in acetonitrile, acidity and homoconjugation.
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10

Valdug, Claudete J., Eunice Valduga, Martha Adaime, and Nadia Viaro. "NIOBIUM AS A POTENTIOMETRIC SENSOR IN REDOX TITRATIONS WITH AND WITHOUT PASSIVATION BY AMMONIUM MOLYBDATE." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2, no. 2 (December 20, 1994): 55–59. http://dx.doi.org/10.48141/sbjchem.v2.n2.1994.57_1994.pdf.

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The Pt indicator electrode has been commonly used for redox potentiometric titrations. In this work the Nb indicator electrode is suggested as an alternative for the Pt indicator electrode for the redox potentiometric titrations of the system Fe(ll)/K2Cr2O7. The utilization of the proposed electrode has been studied with and without passivation. The passivation is made by electrode immersion in oxidising anodic inhibitor of NH4MoO4. The result was an observed increase of the potentiometric leap from 30 mV to 60 mV, allowing better visualization of the equivalence point. The same equivalence point was observed with the conventional and proposed electrode. With the Nb electrode, an inverse potentiometric leap was also obtained.
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11

Jokic, Anja, Radmila Dzudovic, Ljiljana Jaksic, and Snezana Nikolic-Mandic. "The application of hydrogen-palladium electrode for potentiometric acid-base determinations in tetrahydrofuran." Journal of the Serbian Chemical Society 78, no. 8 (2013): 1203–12. http://dx.doi.org/10.2298/jsc120927018j.

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The application of the hydrogen-palladium electrode (H2/Pd) as the indicator electrode for the determination of relative acidity scale (Es, mV) of tetrahydrofuran (THF) and the potentiometric titrations of acids in this solvent was investigated. The relative acidity scale tetrahydrofuran was determined from the difference half-neutralization potentials of perchloric acid and tetrabutylammonium hydroxide (TBAH), which were measured by using both H2/Pd-SCE and glass-SCE electrode pairs. The experimentally obtained value of Es scale THF with a H2/Pd-SCE electrode pair was 1155 mV, and those obtained with glass-SCE electrode pair 880 mV. By using a H2/Pd indicator electrode, the individual acids (benzoic acid, palmitic acid, maleic acid, acetyl acetone, ?-naphthol) and two component acid mixtures (benzoic acid + ?-naphthol, palmitic acid + ?-naphthol, maleic acid + ?-naphthol and maleic acid + ftalic acid) were titrated with a standard solution of TBAH. In addition, sodium methylate and potassium hydroxide proved to be very suitable titrating agents for titrating of the individual acids and the acids in mixtures, respectively. The relative error of the determination of acids in mixture was less than 3%. The results are in agreement with those obtained by a conventional glass electrode. The advantages of H2/Pd electrode over a glass electrode in potentiometric acid-base determinations in tetrahydrofuran lie in the following: this electrode gives wider relative acidity scale THF, higher the potential jumps at the titration end-point and relatively fast response time; furthermore, it is very durable, simple to prepare and can be used in the titrations of small volumes.
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12

Stong, John D. "A computer-controlled potentiometric/spectrophotometric titrator." Journal of Automatic Chemistry 10, no. 2 (1988): 95–100. http://dx.doi.org/10.1155/s1463924688000185.

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A laboratory computer controlled potentiometric titrator interfaced to a diode array spectrophotometer is described. The titrator consists of widely used, commercially available components; therefore, major attention is given to modes of interconnection and software implementation in data format and system control. Replicate potentiometric titrations of glycines gave a relative standard deviation in titre of 1.035% and a relative standard deviation in pH of 0.745%. Replicate spectrophotometric titrations of bromophenol blue were analysed at three wavelengths to yield pKa= 3.898 ± 0.075 (1.9% rsd).Methods of data presentation and manipulation are presented.
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13

Rajantie, Hanna, and David E. Williams. "Potentiometric titrations using dual microband electrodes." Analyst 126, no. 11 (September 3, 2001): 1882–87. http://dx.doi.org/10.1039/b104698p.

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14

Simon, Barbara, László Tolner, Márk Rékási, and Erika Michéli. "Soil acidity investigation by potentiometric titrations." Cereal Research Communications 34, no. 1 (March 2006): 283–86. http://dx.doi.org/10.1556/crc.34.2006.1.71.

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15

Ramamurthy, Narayanan, Narayan Baliga, Joyce A. Wahr, Ulrich Schaller, Victor C. Yang, and Mark E. Meyerhoff. "Improved protamine-sensitive membrane electrode for monitoring heparin concentrations in whole blood via protamine titration§." Clinical Chemistry 44, no. 3 (March 1, 1998): 606–13. http://dx.doi.org/10.1093/clinchem/44.3.606.

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Abstract An improved protamine-sensitive electrode based on a polymeric membrane doped with the charged ion exchanger dinonylnaphthalenesulfonate (DNNS) is used for monitoring heparin concentrations in whole blood. The electrode exhibits significant nonequilibrium potentiometric response to polycationic protamine over the concentration range of 0.5–20 mg/L in undiluted whole-blood samples. The sensor can serve as a simple end point detector for the determination of heparin via potentiometric titrations with protamine. Whole-blood heparin concentrations determined by the electrode method (n ≥157) correlate well with other protamine titration-based methods, including the commercial Hepcon HMS assay (r = 0.934) and a previously reported potentiometric heparin sensor-based method (r = 0.973). Reasonable correlation was also found with a commercial chromogenic anti-Xa heparin assay (r = 0.891) with corresponding plasma samples and appropriate correction for whole-blood hematocrit levels. Whereas a significant positive bias (0.62 kU/L; P <0.001) is observed between the anti-Xa assay and the protamine sensor methods, insignificant bias is observed between the protamine sensor and the Hepcon HMS tests (0.08 kU/L; P = 0.02). The possibility of fully automating these titrations offers a potentially simple, inexpensive, and accurate method for monitoring heparin concentrations in whole blood.
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16

Al-Ghannam, Sheikha M., Abdalla M. S. Abulkibash, and Abeer M. Al-Olyyan. "Differential Electrolytic Potentiometric Determination of Some Amino Acids in Dosage Forms." Journal of AOAC INTERNATIONAL 87, no. 3 (May 1, 2004): 671–76. http://dx.doi.org/10.1093/jaoac/87.3.671.

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Abstract The application of direct-current differential electrolytic potentiometry to the nonaqueous titration of amino acids was investigated. The basic character of amino acids in acetic acid was enhanced to permit their direct titration with perchloric acid. A pair of antimony electrodes was used as an indicating system. The shapes of the titration curves obtained were almost symmetrical with sharp peaks. The optimum current density for those titrations was found to be 1–2 μA/cm2. The procedure was applied successfully to the determination of certain amino acids in drug formulations, and the results were favorably compared statistically with those obtained by official methods.
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17

Mustafa, S., A. Naeem, N. Rehana, and T. Hussain. "Exchange of Some Divalent Metal Cations and Their Effect on the Dissociation of Iron(III) Phosphate." Adsorption Science & Technology 13, no. 4 (August 1996): 241–60. http://dx.doi.org/10.1177/026361749601300403.

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Potentiometric titrations of iron(III) phosphate have shown an apparently weak monobasic acid behaviour towards alkali, alkaline earth and divalent transition metal ions. The selectivity sequence and dissociation of the exchanger was found to increase in the order Cu2+ > Zn2+ > Ni2+ > Ca2+ > K+. The dissociation constants of iron(III) phosphate have been determined from Potentiometric titration data in the temperature range 303–323 K. In addition, the exchange of Cu2+, Zn2+ and Co2+ on iron(III) phosphate and the effect of these ions on dissociation were also studied as a function of concentration, temperature and solution pH value. The thermodynamic parameters ΔH0, ΔS0 and ΔG0 for the dissociation of iron(III) phosphate are also presented.
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18

OLIVEIRA, S. L. A., É. A. SILVA, L. Z. PAULA, C. A. L. CARDOSO, G. J. ARRUDA, L. H. C. ANDRADE, and A. R. FIORUCCI. "DEVELOPMENT OF SULFENTRAZONE EXTRACTION PROCEDURE FROM COMMERCIAL HERBICIDE FORMULATION AND DETERMINATION OF ITS IONIZATION CONSTANT (pKa) BY POTENTIOMETRIC TITRATION." Periódico Tchê Química 15, no. 29 (January 20, 2018): 204–18. http://dx.doi.org/10.52571/ptq.v15.n29.2018.204_periodico29_pgs_204_218.pdf.

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The herbicide sulfentrazone (SFZ) is widely used in soybean and sugarcane crops, although it is classified as very dangerous to the environment. To minimize barriers to the development of research with this herbicide due to the high cost of acquisition of its analytical standard and the availability of few distributors to acquire the standard in the country, a procedure of extraction and purification of SFZ was developed from a commercial herbicide formulation available in Brazil. Using the most suitable experimental conditions established for the extraction procedure, the SFZ content in the resulting solid after extraction and drying was 97.5% (m/m), which value was determined by acid-base potentiometric titrations. To characterize the solid obtained in this procedure, the material was studied by thermal analysis (thermogravimetry and differential scanning calorimetry) and Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) to confirm the presence of functional groups present in the SFZ molecule. Thermal analysis of the solid resulting from the extraction indicated processes of melting, thermal degradation and volatilization of the SFZ during its heating. By potentiometric titrations of the purified solid dissolved in water/acetonitrile (ACN) binary mixtures, it was possible to determine the ionization constant (pKa) of SFZ in water at 25.0ºC. By this study, extrapolated value of pKa in water is 6.45 obtained from the linear correlation of pKa versus molar ACN fraction plot. The value obtained at 25.0 °C by potentiometry in this study is quite close to the literature value of 6.56 determined at 20 °C by the spectrophotometric technique. However, the pKa value determined by potentiometric titrations of dilute solutions of the SFZ commercial formulations was much higher than that of 6.56, indicating that the degree of ionization of SFZ under herbicide application conditions can be quite distinct in the presence of possible adjuvants present in the commercial formulation of the herbicide.
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19

Kamalasekaran, Kavitha. "Potentiometric Titration of Vanadium (V) with Iron (II) in the Presence of NTA and DTPA Using Dry-Cell Graphite Electrode." Revista de Chimie 72, no. 3 (July 29, 2021): 144–58. http://dx.doi.org/10.37358/rc.21.3.8445.

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A sensitive potentiometric titration for vanadium (V) based effect of ligands such as nitrilotriacetic acid (NTA) and diethylenetriaminepenta-acetic acid (DTPA) are reviewed. The potential iron system decreased the presence of NTA and DTPA. In this case, iron (III) increased with respect to the vanadium (IV) volume. The production of iron (III)-ligand complex has increased. This result suggested that the formation of V(V)-NTA and V(V)-DTPA complexes were less favoured than that of V(IV)-NTA and V(IV)-DTPA complexes. The calculated correlation coefficients (r) conveyed the effectiveness of the graphite electrode as the indicator electrode for the potentiometric titrations. On comparing the potential jump values, the extent of potential caused by DTPA was found to be more than that of NTA. The utilization of graphite electrode has facilitated the potentiometric titration by significantly causing larger potential jump. This method was precise and accurate as no interference of foreign ions was observed. Hence, the approach could be applied to the vanadium (V) of any samples.
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20

Pereira, R. Calvelo, M. Camps Arbestain, M. Vazquez Sueiro, and J. A. Maciá-Agulló. "Assessment of the surface chemistry of wood-derived biochars using wet chemistry, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy." Soil Research 53, no. 7 (2015): 753. http://dx.doi.org/10.1071/sr14194.

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In order to understand the reactivity of biochar in soil, we thoroughly examined the carbonaceous surface of different biochars, paying particular attention to the distribution of oxygen-containing functional groups. Biochar was produced from pine, poplar and willow at two different temperatures (400 and 550°C) and characterised using elemental analysis and wet chemistry (Boehm and potentiometric titrations, cation-exchange capacity (CEC) measurement). In addition, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses were performed on both untreated and acid-washed biochar samples. Qualitative relationships were observed between data generated from the titration methods under investigation and XPS analyses, both describing the general distribution of oxygen-containing surface functional groups. Total acidity of biochar ranged widely, between 32 and 1067 mmol kg–1, and was mostly attributed to the presence of hydroxyl or phenol groups. The number of functional groups containing oxygen decreased with increasing pyrolysis temperature, mainly because of a decrease in the content of phenol groups. A quantitative comparison of titrations and CEC (i.e. biochar’s ion-exchange capacity) measurements was compromised by a masking effect caused by the biochar’s inorganic fraction (<8%). An acid-washing step with nitric acid was shown not to alter the biochar surface systematically. The use of potentiometric titrations with an acid-washing pretreatment proved to be suitable to quantify biochar acidic functional groups, and hence biochar acidity.
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21

Golovko, Dmitriy, Virender Sharma, Olga Pavlova, Elena Belyanovskaya, Igor Golovko, Victoria Suprunovich, and Radek Zboril. "Determination of submillimolar concentration of ferrate(VI) in alkaline solutions by amperometric titration." Open Chemistry 9, no. 5 (October 1, 2011): 808–12. http://dx.doi.org/10.2478/s11532-011-0069-8.

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AbstractA new amperometric titration method was developed for quantitative determination of ferrate(VI) (FeVIO42−) in the 7.06×10−5−5.73×10−3 M concentration range. Chromium(III) hydroxide solution was used as the titrant. The diffusion current (Id) had a linear relationship with the concentration of ferrate(VI) and slopes were dependent on the concentration of NaOH. The amperometric titration could detect a lower concentration of ferrate(VI) than could potentiometric and colorimetric titrations. The method was applied successfully to determine concentrations of ferrate(VI), generated electrochemically, in strong alkaline solutions.
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22

Cladera, A., A. Caro, J. M. Estela, and V. Cerdà. "A fully automatic system for acid-base coulometric titrations." Journal of Automatic Chemistry 12, no. 6 (1990): 258–62. http://dx.doi.org/10.1155/s1463924690000323.

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An automatic system for acid-base titrations by electrogeneration of H+and OH-ions, with potentiometric end-point detection, was developed. The system includes a PC-compatible computer for instrumental control, data acquisition and processing, which allows up to 13 samples to be analysed sequentially with no human intervention.The system performance was tested on the titration of standard solutions, which it carried out with low errors and RSD. It was subsequently applied to the analysis of various samples of environmental and nutritional interest, specifically waters, soft drinks and wines.
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23

Vasilyeva, Marina S., Vladimir S. Rudnev, E. S. Zykova, Alexander Yu Ustinov, Ksenia A. Sergeeva, A. V. Nepomnyaschiy, I. V. Lukiyanchuk, and Galina I. Marinina. "Ti/TiO2, Au Electrodes Prepared by Plasma Electrolytic Oxidation and Electron Beam Evaporation." Defect and Diffusion Forum 386 (September 2018): 326–31. http://dx.doi.org/10.4028/www.scientific.net/ddf.386.326.

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Ti/TiO2,Au electrodes were prepared via plasma electrolytic oxidation (PEO) of Ti plate, followed by deposition of a thin (10 nm) Au layer by electron beam evaporation (EBE). The electrodes obtained were used for potentiometric indication of different types of chemical reactions. Ti/TiO2,Au electrodes showed an excellent performance for end point indication in the oxidation-reduction and complexometric titrations similar to the traditional Pt and in the acid-base titration similar to glass electrode.
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24

Sakač, Nikola, Dubravka Madunić-Čačić, Dean Marković, Lucija Hok, Robert Vianello, Bojan Šarkanj, Bojan Đurin, et al. "Potentiometric Surfactant Sensor Based on 1,3-Dihexadecyl-1H-benzo[d]imidazol-3-ium for Anionic Surfactants in Detergents and Household Care Products." Molecules 26, no. 12 (June 14, 2021): 3627. http://dx.doi.org/10.3390/molecules26123627.

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A 1,3-dihexadecyl-1H-benzo[d]imidazol-3-ium-tetraphenylborate (DHBI-TPB) ion-pair implemented in DHBI-TPB surfactant sensor was used for the potentiometric quantification of anionic surfactants in detergents and commercial household care products. The DHBI-TPB ion-pair was characterized by FTIR spectroscopy and computational analysis which revealed a crucial contribution of the C–H∙∙∙π contacts for the optimal complex formation. The DHBI-TPB sensor potentiometric response showed excellent analytical properties and Nernstian slope for SDS (60.1 mV/decade) with LOD 3.2 × 10−7 M; and DBS (58.4 mV/decade) with LOD 6.1 × 10−7 M was obtained. The sensor possesses exceptional resistance to different organic and inorganic interferences in broad pH (2–10) range. DMIC used as a titrant demonstrated superior analytical performances for potentiometric titrations of SDS, compared to other tested cationic surfactants (DMIC > CTAB > CPC > Hyamine 1622). The combination of DHBI-TPB sensor and DMIC was successfully employed to perform titrations of the highly soluble alkane sulfonate homologues. Nonionic surfactants (increased concentration and number of EO groups) had a negative impact on anionic surfactant titration curves and a signal change. The DHBI-TPB sensor was effectively employed for the determination of technical grade anionic surfactants presenting the recoveries from 99.5 to 101.3%. The sensor was applied on twelve powered samples as well as liquid-gel and handwashing home care detergents containing anionic surfactants. The obtained results showed good agreement compared to the outcomes measured by ISE surfactant sensor and a two-phase titration method. The developed DHBI-TPB surfactant sensor could be used for quality control in industry and has great potential in environmental monitoring.
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25

Zakhari, N. Aziz, and K. Artur Kovar. "Nonaqueous Titration of Halides of Nitrogenous Bases, Using Trifluoromethyl Sulfonic Acid." Journal of AOAC INTERNATIONAL 69, no. 4 (July 1, 1986): 620–24. http://dx.doi.org/10.1093/jaoac/69.4.620.

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Abstract Trifluoromethyl sulfonic acid in glacial acetic acid has been compared with perchloric acid as a titrant in 4 solvent systems: glacial acetic acid, acetic anhydride, a mixture of both, and acetone. The comparison was limited to the determination of halides of nitrogenous bases with and without the use of mercury(II) acetate reagent. The results of the visual titrations showed that both acids are comparable tit rants. However, trifluoromethyl sulfonic acid proved to be superior to perchloric acid in potentiometric titrations carried out in acetic acid-acetic anhydride mixtures. Moreover, the nonoxidizing properties exhibited by trifluoromethyl sulfonic acid proved advantageous over perchloric acid in the visual detection of end points in the titration of phenothiazine derivatives in anhydrous acetic acid, using crystal violet indicator.
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26

Zuyi, Tao, and Chu Taiwei. "Points of Zero Charge and Potentiometric Titrations." Adsorption Science & Technology 21, no. 6 (July 2003): 607–16. http://dx.doi.org/10.1260/026361703771953622.

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27

Selig, Walter S. "Comments on potentiometric titrations with sodium nitroprusside." Microchemical Journal 37, no. 3 (June 1988): 382–83. http://dx.doi.org/10.1016/0026-265x(88)90152-x.

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Karimvand, Somaiyeh Khodadadi, Xuan Anh Nguyen, Hamid Abdollahi, Robert Burns, Sarah Clifford, Marcel Maeder, Nichola McCann, Yorck-Michael Neuhold, and Graeme Puxty. "Activity-based analysis of potentiometric pH titrations." Analytica Chimica Acta 1075 (October 2019): 49–56. http://dx.doi.org/10.1016/j.aca.2019.05.002.

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29

Antonijevi?, M. M., B. Vukanovi?, and R. Mihajlovic. "Pyrite as sensor for potentiometric precipitation titrations." Analyst 121, no. 2 (1996): 255. http://dx.doi.org/10.1039/an9962100255.

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30

Grabowski, Lauren E., and Scott R. Goode. "Determining a Solubility Product Constant by Potentiometric Titration To Increase Students’ Conceptual Understanding of Potentiometry and Titrations." Journal of Chemical Education 94, no. 5 (March 15, 2017): 636–39. http://dx.doi.org/10.1021/acs.jchemed.6b00460.

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31

Yi, Haiqing, Yan Cheng, Yu Zhang, Qingji Xie, and Xiaoping Yang. "Potentiometric and UV-Vis spectrophotometric titrations for evaluation of the antioxidant capacity of chicoric acid." RSC Advances 10, no. 20 (2020): 11876–82. http://dx.doi.org/10.1039/d0ra01248c.

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32

Price, Randi, and Ping Wan. "Determination of Quaternary Ammonium Compounds by Potentiometric Titration with an Ionic Surfactant Electrode: Single-Laboratory Validation." Journal of AOAC INTERNATIONAL 93, no. 5 (September 1, 2010): 1542–52. http://dx.doi.org/10.1093/jaoac/93.5.1542.

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Abstract A potentiometric titration for determining the quaternary ammonium compounds (QAC) commonly found in antimicrobial products was validated by a single laboratory. Traditionally, QACs were determined by using a biphasic (chloroform and water) manual titration procedure. Because of safety considerations regarding chloroform, as well as the subjectivity of color indicator-based manual titration determinations, an automatic potentiometric titration procedure was tested with quaternary nitrogen product formulations. By using the Metrohm Titrando system coupled with an ionic surfactant electrode and an Ag/AgCl reference electrode, titrations were performed with various QAC-containing formulation products/matrixes; a standard sodium lauryl sulfate solution was used as the titrant. Results for the products tested are sufficiently reproducible and accurate for the purpose of regulatory product enforcement. The robustness of the method was measured by varying pH levels, as well as by comparing buffered versus unbuffered titration systems. A quantitation range of 11000 ppm quaternary nitrogen was established. Eight commercially available antimicrobial products covering a variety of matrixes were assayed; the results obtained were comparable to those obtained by the manual titration method. Recoveries of 94 to 104% were obtained for spiked samples.
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33

Abramovic, Biljana, Valéria Guzsvány, Ferenc Gaál, and Zoran Lausevic. "Potentiometric application of boron- and phosphorus-doped glassy carbon electrodes." Journal of the Serbian Chemical Society 66, no. 3 (2001): 179–88. http://dx.doi.org/10.2298/jsc0103179a.

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A comparative study was carried out of the potentiometric application of boronand phosphorus-doped and undoped glassy carbon samples prepared at the same heat treatment temperature (HTT 1000 ?C). The electrochemical activities of the obtained electrode materials were investigated on the example of argentometric titrations. It was found that the electrochemical behaviour of the doped glassy carbon samples are very similar to a Sigri (undoped) glassy carbon sample (HTT 2400 ?C). The experiments showed that the potentiometric response depends on the polarization mode, the nature of the sample, the pretreatment of the electrode surface, and the nature of the supporting electrolyte. The amounts of iodide, bromide, and of chloridewere determined to be 1.27 mg, 0.80 mg and 0.54 mg, respectively, with a maximum relative standard deviation of less than 1.1%. The obtained results are in good agreement with the results of comparative potentiometric titrations using a silver indicator electrode. The titrationmethod was applied to the indirect determination of pyridoxine hydrochloride, i.e., vitamin B6.
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34

Michałowski, Tadeusz, and Anna M. Michałowska-Kaczmarczyk. "The modified Gran methods in potentiometric redox titrations derived according to GATES/GEB principles." Journal of Chemical Engineering And Bioanalytical Chemistry 2, no. 1 (2018): 1–10. http://dx.doi.org/10.25177/jcebc.2.1.5.

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35

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 studied by pH and conductometric titrations, in aqueous and alcoholic media, with each of the reagents alternatively used as titrant. The electrometric experiments provide definite evidence of the formation of normal-La2O3.3WO3, para-5La2O3.36WO3 and meta-La2O3.12WO3 tungstates in the vicinity of pH 6.3, 5.0 and 4.2, respectively. Analytical investigations on the precipitates formed confirm the results of the electrometric study.
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36

Kellomäki, Aarre, A. Kjekshus, E. Røst, K. Grjotheim, S. Larsen, M. Wilgocki, and Svante Wold. "Characterization of Bitumens by Means of Potentiometric Titrations." Acta Chemica Scandinavica 44 (1990): 195–97. http://dx.doi.org/10.3891/acta.chem.scand.44-0195.

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37

Greenspan, Paul D., David E. Burchfield, and Hans Veening. "Coulometric titrations using computer-interfaced potentiometric endpoint detection." Journal of Chemical Education 62, no. 8 (August 1985): 688. http://dx.doi.org/10.1021/ed062p688.

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Peper, Shane, Alan Ceresa, Eric Bakker, and Ernö Pretsch. "Improved Detection Limits and Sensitivities of Potentiometric Titrations." Analytical Chemistry 73, no. 15 (August 2001): 3768–75. http://dx.doi.org/10.1021/ac001475b.

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39

Riyazuddin, P., and D. Devika. "Potentiometric Acid-Base Titrations with Activated Graphite Electrodes." Journal of Chemical Education 74, no. 10 (October 1997): 1198. http://dx.doi.org/10.1021/ed074p1198.

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40

Selig, W. S. "The use of graphite electrodes in potentiometric titrations." Synthetic Metals 23, no. 1-4 (March 1988): 503–7. http://dx.doi.org/10.1016/0379-6779(88)90528-0.

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41

Durliat, H., and M. Comtat. "Critical evaluation of potentiometric redox titrations in enology." Analytica Chimica Acta 545, no. 2 (July 2005): 173–81. http://dx.doi.org/10.1016/j.aca.2005.04.084.

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42

Fisicaro, E. "Potentiometric titrations in methanol/water medium: Intertitration variability." Talanta 35, no. 10 (October 1988): 769–74. http://dx.doi.org/10.1016/0039-9140(88)80181-4.

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43

Machesky, Michael L., David J. Wesolowski, Donald A. Palmer, and Ken Ichiro-Hayashi. "Potentiometric Titrations of Rutile Suspensions to 250°C." Journal of Colloid and Interface Science 200, no. 2 (April 1998): 298–309. http://dx.doi.org/10.1006/jcis.1997.5401.

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44

Kolthoff, I. M. "The Application of titanous chloride to potentiometric titrations." Recueil des Travaux Chimiques des Pays-Bas 43, no. 11 (September 3, 2010): 768–74. http://dx.doi.org/10.1002/recl.19240431103.

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45

Kolthoff, I. M., and O. Tomiček. "The application of titanous chloride to potentiometric titrations." Recueil des Travaux Chimiques des Pays-Bas 43, no. 11 (September 3, 2010): 775–83. http://dx.doi.org/10.1002/recl.19240431104.

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46

Tomiček, O. "The application of titanous chloride to potentiometric titrations." Recueil des Travaux Chimiques des Pays-Bas 43, no. 11 (September 3, 2010): 784–97. http://dx.doi.org/10.1002/recl.19240431105.

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47

Tomiček, O. "The application of titanous chloride in potentiometric titrations." Recueil des Travaux Chimiques des Pays-Bas 43, no. 11 (September 3, 2010): 798–807. http://dx.doi.org/10.1002/recl.19240431106.

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48

Tomiček, O. "The application of titanous chloride in potentiometric titrations." Recueil des Travaux Chimiques des Pays-Bas 43, no. 11 (September 3, 2010): 808–15. http://dx.doi.org/10.1002/recl.19240431107.

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49

Bansode, Tanaji N. "Potentiometric pKa determination of biological active phenothiazine in different aqua-organic solvents." International Journal of ChemTech Research 13, no. 1 (2020): 25–29. http://dx.doi.org/10.20902/ijctr.2019.130103.

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Potentiometric titrations of phenothiazines derivatives were performed in methanolwater, ethanol-water, acetonitrile-water and dioxane-water mixtures with varying contents of organic solvent. All titrations were performed in aqua-organic medium at constant ionic strength (0.15 mol⋅dm−3) and at different temperatures (25 to 45 °C). The pKa were determined at different aqua-organic proportions. Effect of temperature and dielectric constant on dissociation constant has been compared. The pKa values were then obtained by Yasuda‐Shedlovsky extrapolation.
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50

Antonijevic, M., R. Mihajlovic, and B. Vukanovic. "Natural Monocrystalline Pyrite as Sensor for Potentiometric Redox Titrations. Part I. Titrations with Permanganate." Sensors 2, no. 4 (April 30, 2002): 153–63. http://dx.doi.org/10.3390/s20400153.

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