銀複硫化物イオン電極による硫黄の定量

概要

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The mixed sulfide electrode method was studied as a method for the determination of sulfur in metal sulfides. Determination of sulfur is reduced, after all, to the precise and high sensitivity measurement of S^<2-> ion concentration in alkaline solution. For absorbing H_2S gas and keeping the S^<2-> ions in solution, several kinds of absorber solutions were tested : i.e., NaOH, NaOH-EDTA, NaOH-glycerine, NaOH-ascorbic acid, NaOH-EDTA-glycerine, NaOH-EDTA-ascorbic acid, NaOH-glycerine-ascorbic acid and NaOH-EDTA-glycerine-ascorbic acid solutions. The solution, which exhibited the linearlity down to the lowest S^<2-> concentration, was the mixed solution with 0.1M NaOH, 0.0137M EDTA, 2.7487M glycerine and 0.0284M L-ascorbic acid. The sulfide ion electrodes synthesized and tested in combination with the above absorber solution were Ag-Cd-S, Ag-Ag_2S, Hg-Cd-S and Ag-Hg-S systems. The linearlity was shown to exist down to (10)^<-8>M S^<2-> with the Ag-Hg-S mixed sulfide electrode containing 20 at% Hg.ion electrodesilver mixed sulfidesulfide-ion determinationabsorption solutionNaOH solutionEDTA solutionglycerine solutionL-ascorbic acid solutionNaOH-EDTA-glycerine-L-ascorbic acidAg-Cd-S electrodeAg-Hg-S electrodeS^<2-> detection limit
東北大学の論文