Effects of Surfactants on the Toxicity of Chemical Substances Acting on Daphnia (2nd Report)-Toxicity When Chemical Substances and Surfactants Coexist
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概要
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EC<SUB>50</SUB> and LC<SUB>50</SUB> of <I>Daphnia magna</I> of acute toxicity tests for ten chemical substances (anesthetic) were determined. We also investigated the toxicity changes when the chemical substance coexists with a surfactant. The results of the binary acute toxicity tests using <I>Daphnia magna</I> on ten chemical substances and two surfactants, Polyoxyethylene (10) octylphenyl ether (POE) and Sodium dodecylbenzenesulfonate (DBS) were investigated using the toxic unit concept. In the case of POE-chemical system, 4 chemical substances exhibited simple additive. The other 6 chemical substances are considered to be slightly less than additive. In the case of DBS-chemical system, 7 out of 8 chemical substances tested were judged to be less than additive or antagonistic. DBS and Bisphenol A intake by <I>Daphnia</I> were analyzed. The decrease in the toxicity of Bisphenol A in the presence of DBS is concluded to be a decrease in the uptake of Bisphenol A in the bodies of <I>Daphnia</I>.
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