ISO 13358:1997

Overview

ISO 13358:1997 specifies a laboratory method for the determination of easily released sulfide in water and wastewater. The procedure covers mass concentrations typically from 0.04 mg/L to 1.5 mg/L (with smaller sample aliquots enabling higher concentrations). The method stabilizes soluble sulfide with zinc acetate, strips the easily released sulfide by nitrogen gas at pH 4, and quantifies it spectrometrically after formation of methylene blue (measured at 665 nm).