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Formation of iodinated disinfection by-products during oxidation of iodide-containing water with potassium permanganate.

Journal of hazardous materials (2012-10-16)
Tao Ye, Bin Xu, Yi-Li Lin, Chen-Yan Hu, Sheng-Ji Xia, Lin Lin, Seleli Andrew Mwakagenda, Nai-Yun Gao
ABSTRACT

This study shows that iodinated disinfection by-products (I-DBPs) including iodoform (IF), iodoacetic acid (IAA) and triiodoacetic acid (TIAA) can be produced when iodide-containing waters are in contact with potassium permanganate. IF was found as the major I-DBP species during the oxidation. Iodide was oxidized to HOI, I(2) and I(3)(-), consequently, which led to the formation of iodinated organic compounds. I-DBPs varied with reaction time, solution pH, initial concentrations of iodide and potassium permanganate. Yields of IF, IAA and TIAA increased with reaction time and considerable I-DBPs were formed within 12 h. Peak IF yields were found at circumneutral pH range. However, formation of IAA and TIAA was favored under acidic conditions. Molar ratio of iodide to potassium permanganate showed significant influence on formation of IF, IAA and TIAA. The formation of IF, IAA and TIAA also depended on the characteristics of the waters.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, Hg ≤0.000005%, ≥99.0% (RT)
Sigma-Aldrich
Potassium permanganate, ≤150 μm particle size, 97%
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%, low in mercury
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%
Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99%