Dt. Pierce et al., LOW PARTS-PER-BILLION DETERMINATION OF SULFIDE BY COULOMETRIC ARGENTOMETRY, Environmental science & technology, 32(11), 1998, pp. 1734-1737
Present methods for the determination of sulfide in wastewater are hin
dered by poor detection limits and extensive sample pretreatment A les
s problematic method has been developed with a method detection limit
of 2.5 mu g L-1. With this technique, sparged hydrogen sulfide is prec
ipitated in an acetate-supporting electrolyte by electrogenerated silv
er ions. Analysis of base-preserved samples was performed with no pret
reatment other than volumetric dilution. Metals, halides, and nitrogen
-base salts were studied as possible interferences to the method. Dire
ct comparisons with the standard methylene blue method were made for b
oth municipal and industrial wastewaters. The present method was found
to be far less inhibited by sample turbidity.