Electrochemically determined

ELECTROCHEMICAL DETERMINATION OF GUAR IN COPPER ELECTROWINING PROCESS... 

APPLICATION OF SURFACE ELECTROCHEMICAL PASSIVATION OF LEAD-ANTIMONY ALLOY FOR A SIMPLE AND RAPID ELECTROCHEMICAL DETERMINATION OF ANTIMONY CONTENT OF ITS ALLOYS... 

Leclercq, M., The Electrochemical Determination of the Proportions of Metal and Metal Oxide in Zinc-base Coatings Obtained by Hot Spraying , Anii -Corr. Methods Mater., 25 No. 9, 5 (1978)... 

Potentiostatic methods, being capable of detecting differences in corrosion and passivation behaviour of various parts of a heterogeneous surface, have been applied to the electrochemical determination of grain boundary corrosion... 

Mirovsky Y, Tenne R, Hodes G, Cahen D (1982) Photoelectrochemical solar ceUs Interpretation of cell performance using electrochemical determination of photoelectrode properties. Thin Solid Films 91 349-355... 

Electrochemical Determination. An electrochemical method has been developed to allow on-line monitoring of biohlm activity in aqueous environments. 

Cohen JL, Volpe DJ, Abmna HD. 2007. Electrochemical determination of activation energies for methanol oxidation on polycrystalline platinum in acidic and alkaline electrolytes. Phys Chem Chem Phys 9 49-77. 

MA Desai, CV Nicholas, P Vadgama. Electrochemical determination of the permeability of porcine mucus to model solute compounds. J Pharm Pharmacol 43 124-127, 1990. 

F. Bedioui, S. Trevin, and J. Devynck, Chemically modified microelectrodes designed for the electrochemical determination of nitric oxide in biological systems. Electroanalysis 8, 1085-1091 (1996). 

M. Rievaj, J. Lietava, and D. Bustin, Electrochemical determination of nitric oxide in blood samples. Chem. Pap.-Chem. Zvesti 58, 306-310 (2004). 

K. Tanaka, F. Kobayashi, Y. Isogai, and T. Iizuka, Electrochemical determination of superoxide anions generated from a single neutrophil. Bioelectrochem. Bioenerg. 26, 413—421 (1991). 

S. Mesaros, Z. Vankova, A. Mesarosova, P. Tomcik, and S. Grunfeld, Electrochemical determination of superoxide and nitric oxide generated from biological samples. Bioelectrochem. Bioenerg. 46, 33-37 (1998). 

P.J. Kulesza and Z. Galus, Polynuclear transition metal hexacyanoferrate films. In-situ electrochemical determination of their composition. J. Electroanal. Chem. 267, 117-127 (1989). 

It has been demonstrated that the presence of CNTs greatly increases the oxidation peak current of 6-benzylaminopurine. The CNT-modified electrode is suitable for the determination of trace amounts of benzylaminopurine and has the advantages of high sensitivity, quick response, and good stability [86], Wang et al. have studied the electro-catalytic oxidation of thymine at a a-cyclodextrin incorporated CNT coated electrode in an alkaline media. A sensitive detection scheme for thymine has been further developed by using differential pulse voltammetry [87], The electrochemical determination... 

S. Lu, Electrochemical determination of 8-azaguanine in human urine at a multi-carbon nanotubes modified electrode. Microchem. J. 77, 37-42 (2004). 

S. Janietz, D.D.C. Bradley, M. Grell, C. Giebeler, M. Inbasekaran, and E.P. Woo, Electrochemical determination of the ionization potential and electron affinity of poly(9,9-dioctylfluorene), Appl. Phys. Lett., 73 2453-2455, 1998. 

For the mechanistic interpretation of activation volume data for nonsymmetrical electron-transfer reactions, it is essential to have information on the overall volume change that can occur during such a process. This can be calculated from the partial molar volumes of reactant and product species, when these are available, or can be determined from density measurements. Efforts have in recent years focused on the electrochemical determination of reaction volume data from the pressure dependence of the redox potential. Tregloan and coworkers (139, 140) have demonstrated how such techniques can reveal information on the magnitude of intrinsic and solvational volume changes associated with electron-transfer reactions of transition... 

From Eq. (a) it is evident that each molecule of FeS04, upon oxidation, happens to lose one electron. Hence, one mole of FeS04 loses 6.02 x 1023 electrons which is equivalent to 1 Faraday or 96,500 C. Thus, in electrochemical determination of equivalence point the quantity of electricity is almost identical with that required to reduce 1 mole of Ce(S04)2. It follows from here that 1 mole of FeS04 and 1 mole of Ce(S04)2 are chemical equivalents. In other words, 1 g of H, acting as a reducing agent, loses electrons equivalent to 96,500 C. 

Abstract This chapter first explains the natural flotability of some minerals in the aspect of the crystal structure and demonstates the collectorless flotaiton of some minerals and its dependence on the h and pH of pulp. And then the surface oxidation is analysed eletrochemically and the relations of E to the composition of the solutions are calculated in accordance with Nemst Equation. The E h-pH diagrams of several minerals are obtained. Thereafter, electrochemical determination such as linear potential sweep voltammetry (LPSV) and cyclic voltammetry (CV) and surface analysis of surface oxidation applied to the sulphide minerals are introduced. And recent researches have proved that elemental sulfur is the main hydrophobic entity which causes the collectorless flotability and also revealed the relation of the amount of sulfur formed on the mineral surfaces to the recoveries of minerals, which is always that the higher the concentration of surface sulphur, the quicker the collectorless flotation rate and thus the higher the recovery. 

Electrochemical Determination of Surface Oxidation Products of Sulphide Minerals... 

In the previous section, the role of solvent extraction was limited to preparing the analyte for subsequent analysis. A large majority of procedures that use solvent extraction in chemical analysis are used in this fashion. However, the extraction itself, or rather the distribution ratio characterizing it, may provide an appropriate measured signal for analysis. Examples of this use of solvent extraction are found in spectroscopy, isotope dilution radiometry, and ion-selective electrodes using liquid membranes. In the latter case, electrochemical determinations are possible by controlling the local concentration of specific ions in a solution by extraction. 

Figure 5.7 shows a typical application of gas-diffusion membranes isolation of the circulating sample from a voltammetric or potentiometric electrode for the electrochemical determination of gaseous species. The ion-selective electrode depicted in this Figure includes a polymer membrane containing nonactin that is used for the potentiometric determination of ammonia produced in biocatalytic reactions. Interferences from alkali metal ions are overcome by covering the nonactin membrane with an outer hydro-... 

Quentel F, Elleouet C, Madec C. 1994. Electrochemical determination of low levels of residual chlorine dioxide in tap water. Anal Chim Acta 295 85-91. 

Kizek etal. [191] have involved catalytic reaction at mercury electrode to electrochemical determination of met-allothioneins. This determination was based on catalytic processes occurring at very negative potentials and accompanied by catalytic evolution (SH group) of hydrogen. 

Domenech A, Sanchez S, Domenech-Carbo MT, Gimeno JV, Bosch F, Yusa DJ, Sauri MC (2002) Electrochemical determination of the Fe(llI)/Fe(II) ratio in arcaheologi-cal ceramic materials using carbon paste and composite electrodes. Electroanalysis 14 685-696. 

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