Showing papers on "Argentometry published in 2000"
TL;DR: In this paper, the reduction of solid silver iodide on a silver electrode was examined and a mechanism for this process was proposed, which is based on the Langmuir isotherm for low concentrations and with multi-layer models for higher concentrations.
18 citations
Patent•
6 Apr 2000
TL;DR: In this paper, the production of composite powders based on silver-tin oxide comprises continuously adding a solution of a silver compound and a reductant in a reaction cycle to zinc oxide with intensive mixing to precipitate the silver.
Abstract: Production of composite powders based on silver-tin oxide comprises continuously adding a solution of a silver compound and a solution of a reductant in a reaction cycle to a solution of zinc oxide with intensive mixing to precipitate the silver. Preferred Features: The silver compound is silver nitrate, acetate, carbonate, citrate or oxalate. The reductant is ascorbic acid, citric acid, oxalic acid, formic acid or hydroxylamine. In 2O 3, Bi 2O 3, CuO, WO 3 or MoO 3 is contained in the aqueous dispersion of tin oxide.
3 citations
TL;DR: In this paper, a spectrochemical method was developed for the quantitative determination of metallic silver in silver nitrate and silver chloride or bromide matrices exposed to light, based on the oxidation of silver(0) by iron(III) at pH 3.5 in the presence of ferrozine.
Abstract: A spectrochemical method has been developed for the quantitative determination of metallic silver in silver nitrate and silver chloride or bromide matrices exposed to light. The method is based on the oxidation of silver(0) by iron(III) at pH 3.5 in the presence of ferrozine. The resulting absorbance of the iron ferrozine complex is measured at 562 nm. Less than 0.1 mg of metallic silver can be determined with a relative standard deviation better than 6%.
2 citations
TL;DR: In this paper, the interaction of chloride ion with cationic-coated silver surface-enhanced Raman scattering (SERS) substrates was monitored using a competitive complexation technique.
Abstract: The interaction of chloride ion with cationic-coated silver surface-enhanced Raman scattering (SERS) substrates was monitored using a competitive complexation technique. In this approach, the nitrate concentration is kept constant and the chloride ion concentration is varied. The change in the nitrate peak area, ΔANO3, is measured as a function of chloride ion concentration, CCl. The measured response is described by the following relationship: ΔANO3 = VCCl/(K + CCl). Using the value of Κ and the value of the ion-pair constant between the cationic coatings and nitrate ion, it is possible to extract the value of the ion-pair constant for chloride ion. The selectivities of the cationic coatings for nitrate, sulfate, and chloride ions are discussed.