Interference Elimination of Sulfide Determination by Iodometry

Abstract:

As a classical method for sulfide determination in wastewater, iodimetry is adopted by many countries. But the existing of high concentration of reducing materials such as thiosulfate, sulfite and dissolved organic, which cant be eliminated by the pretreatment of zinc acetate-precipitation filtration, have an important influence on determination. The study on elimination method is carried out in this paper. It is indicated that the interference of S₂O₃^2- and SO₃^2- can be eliminated by washing sedimentation with KOH solution of 10%. Iodometric titration with the pretreatment of zinc acetate-precipitation filtration and washing precipitate with 10% KOH is an accurate method to determine the sulfide content.

• Periodical: Advanced Materials Research (Volume 790)
• Pages: 575-578
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.790.575
• Online since: September 2013
• Authors: Lin Wang, Guo Qiang Li, Yong Fa Zhang, Zhen Zhen Li, Yu Liang Shi, Ya Zhen Wang
• Keywords: Iodometry, Sulfide, Sulfite, Thiosulfate

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