Showing papers on "Argentometry published in 1982"
34 citations
TL;DR: A sensitive and selective spectrophotometric method for silver has been established by reacting silver(I) with 2-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-diBr-PADAP in the presence of an anionic surfactant, sodium lauryl sulphate.
27 citations
Patent•
10 Jun 1982
TL;DR: In this paper, a small amt. of silver chloride is laminated and grown on surfaces of photosensitive silver halide grains containing >=60mol% silver bromide, <=10mol% of silver iodide, and remaining silver chloride, and then, they are chemically sensitized, for example, sulfur and or noble metal sensitized in the presence of 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene to prepare the present Silver halide photographic emulsion having high sensitivity, suppressed fog,
Abstract: PURPOSE:To obtain the titled emulsion high in sensitivity, suppressed in fog, and stable in chemical ripenability, by laminating a small amt. of silver chloride and growing it on the surfaces of grains consisting of silver bromide, iodide, and chloride in specified proportions to chemically sensitize them. CONSTITUTION:0.001-0.01mol silver chloride per mol of silver halide is laminated and grown on surfaces of photosensitive silver halide grains containing >=60mol% silver bromide, <=10mol% silver iodide, and remaining silver chloride, and then, they are chemically sensitized, for example, sulfur and or noble metal sensitized in the presence of 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene to prepare the present silver halide photographic emulsion having high sensitivity, suppressed fog, and stable chemical ripenability.
13 citations
TL;DR: In this article, the selectivity of epoxide synthesis in the direct oxidation of ethylene was increased to 85-87% by adding of sodium chloride to the silver catalyst, which corresponds to the maximum expected by mechanistic studies.
Abstract: the selectivity of epoxide synthesis in the direct oxidation of ethylene is increased to 85–87% by addition of sodium chloride to the silver catalyst; this selectivity corresponds to the maximum expected by mechanistic studies.
7 citations
TL;DR: A kinetic method for the determination of 5.0 × 10 -3 -8.6 M silver ion was proposed in this article, based on the catalysis by silver of the reaction between 1,2-diaminoethane and peroxodisulphate, and titration of the residual oxidant.
6 citations
2 citations
Patent•
4 Feb 1982
TL;DR: In this article, a method for measuring the silver concentration of a thiosulfate ion-containing solution is described, comprising providing for hypohalogenite ion to exist in an alkalized solution containing both silver ion and thio sulfate ion, and turbidometrically measuring the concentration of the slightly soluble silver salt thus-formed.
Abstract: A method for measuring the silver concentration of a thiosulfate ion-containing solution is described, comprising providing for hypohalogenite ion to exist in an alkalized solution containing both silver ion and thiosulfate ion, and turbidometrically measuring the concentration of the slightly soluble silver salt thus-formed.
1 citations
Patent•
19 May 1982
TL;DR: In this paper, a method for recovery of pure copper metal by electrolysis of solutions derived from the complex salts was proposed, wherein the impurities are diverted to an anode loop which is separated from the cathode loop by a diaphragm.
Abstract: Cuprous chloride, which is contained in a reduced leach solution or pregnant liquor, can be recovered as a complex salt of alkali metal chloride, such as potassium chloride, or alkaline earth metal chloride or ammonium chloride. The salts are produced by oxidation of a copper ore, such as chalcopyrite, with ferric chloride and cupric chloride, and after removal of insolubles, by adding sufficient metallic copper to the solution to reduce cupric ions to cuprous ions so as to provide a solution containing 1.5 to 2.5 molal potassium chloride, or other metal or ammonium chloride, and cooling the resultant saturated solution to precipitate the potassium chloride-cuprous chloride complex salts and recovering the complex salts. Also provided as a method for recovery of pure copper metal by electrolysis of solutions derived from the complex salts wherein the impurities are diverted to an anode loop which is separated from the cathode loop by a diaphragm.