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Dechlorination with sodium thiosulfate affects the toxicity of wastewater contaminated with copper, cadmium, nickel, or zinc
Author(s) -
Oh SoRin,
Kim JungKon,
Lee MinJung,
Choi Kyungho
Publication year - 2008
Publication title -
environmental toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.813
H-Index - 77
eISSN - 1522-7278
pISSN - 1520-4081
DOI - 10.1002/tox.20325
Subject(s) - sodium thiosulfate , thiosulfate , chemistry , environmental chemistry , daphnia magna , cadmium , zinc , toxicity , metal toxicity , nuclear chemistry , inorganic chemistry , sulfur , heavy metals , organic chemistry
Sodium thiosulfate is recommended by U.S. Environmental Protection Agency for dechlorination of the effluent samples containing residual chlorines before the toxicity testing. For samples contaminated with residual chlorine and metals, e.g., Cd(II), Cu(II) and Ni(II); however, metal toxicity as measured with Daphnia magna was reduced even at approximately half the recommended amount of sodium thiosulfate. Formation of metal‐thiosulfate complexes that are less bioavailable may explain the apparent reduction of metal toxicity. In contrast, for samples spiked with Zn(II), dechlorination with sodium thiosulfate increased toxicity. The use of sodium thiosulfate for dechlorination should be cautioned when the sample under the bioassay is potentially contaminated with metals. © 2008 Wiley Periodicals, Inc. Environ Toxicol, 2008.