Analysis of sulfide and sulfur oxyanions in water and wastewater using capillary zone electrophoresis with detection by indirect and direct UV-Vis spectrophotometry (original) (raw)

Sulfides and sulfur oxyanions, including thiosulfate, sulfate, and polythionates, can impact environmental quality and have negative economic consequences for industrial processes. For example, anaerobic reduction can produce toxic corrosive hydrogen sulfide, and oxidation can lead to environmental acidification accompanied with mobilization of toxic metals. Understanding the chemistry of various systems so that the reductive or oxidative processes can be curtailed requires methods to quantify key sulfur species. Accurate quantitation requires baseline separation and accommodation for co-migrating interferents, such as thiosulfate which co-migrates with chloride, found in abundance in briny waters. A strategy was developed using two capillary zone electrophoresis (CZE) methods, one with direct detection and the other with indirect detection, for speciation analysis of charged sulfur species (sulfate (SO42-), thiosulfate (S2O32-), tetrathionate (S4O62-), sulfite (SO32-), and sulfide ...