Abstract:A microplate algae toxicity assay was performed to test the single and combined toxicities of five organophosphorus pesticides and four triazine herbicides. According to the median effect concentration (EC50), the toxicity effect on the 96h growth inhibition of Scenedesmus obliquus was in the following order: simetryn > atrazine > prometon > metamitron > glyphosate > dichlorvos > phosphamidon > acephate > methamidophos. This indicated that triazine herbicides inhibiting photosynthetic electron transport had greater toxicity than organophosphorus pesticides. The mixtures toxicities were evaluated by using generalized concentration addition (GCA) as the reference model. The mixtures of triazine herbicides in the ratios of EC50 and EC10 (10% effect concentration) presented additive toxicity on Scenedesmus obliquus. The mixtures of organophosphorus pesticides in the ratios of EC50 and EC10 presented additive toxicity in low concentration range and synergistic toxicity in high concentration range. The mixtures of organophosphorus and triazine pesticides in the ratios of EC50 and EC10 presented additive toxicity in low concentration range and synergistic toxicity in high concentration range.
葛会林, 刘树深, 苏冰霞. 通用浓度加和模型预测有机磷与三嗪农药对绿藻的联合毒性[J]. 中国环境科学, 2014, 34(9): 2413-2419.
GE Hui-Lin, LIU Shu-Shen, SU Bing-Xia. Predicting joint toxicity of organophosphorus and triazine pesticides on green algae using the generalized concentration addition model. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2413-2419.