Evaluation of methods for determination of sulfide in slagging fixed-bed coal gasification wastewater
Abstract
The results of this study show that when prompt analysis of the sample is possible (that is, within 24 hours after collection), preservation by the addition of antioxidizing buffer and direct measurement of sulfide with a specific ion electrode is the method of choice. Otherwise, preservation by precipitation with zinc acetate and subsequent iodometric titration is preferred. Compilations of analytical procedures, such as Standard Methods, are an invaluable starting point for selecting laboratory methods for effluent characterization. However, with newly emerging technologies, such as the SFBG, which may produce effluents differing considerably in concentrations or decomposition kinetics and mechanisms from more familiar materials, a careful evaluation of preservation and analytical methods is needed.
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