1992 Volume 8 Issue 2 Pages 219-223
Excess silver(I) from its reaction with sulfide was extracted into 1, 2-dichloroethane using Methylene Blue; the extract was measured spectrophotometrically at 657nm for the determination of sulfide. Hydrogen sulfide, separated from sample matrices, was introduced into a solution in which the hydrogen sulfide was completely converted into silver sulfide. A linear calibration graph with a negative slope was obtained over the range 8.0×10-8-4.5×10-6M (M=mol dm-3) sulfide (0.026-1.44μg of S2- in 10ml(ml=cm3)) and the relative standard deviation was 0.93% at the 2.5 ×10-6M sulfide level when applied to hot-spring water samples. The effective molar desorptivity for sulfide is -1.99×105l mol-1 cm-1.Good recoveries of sulfide from hot-spring waters were achieved using the proposed method.