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Toxic effects of suspended particulate matter and microcystins complexes on Daphnia magna |
FENG Qin-shuang, HUANG Wei, HE Qiang, LI Hong |
Key Laboratory of the Three Gorges Reservoir Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China |
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Abstract In order to investigate the toxic effects of suspended particulate matter and microcystins complexes on Daphnia magna, the most frequently detected variants of microcystin, MC-LR, was selected and the suspended particulate matter (SPM) and MC-LR complexes were prepared. The acute toxicity of MC-LR adsorbed SPM (SPM-MC-LR) on Daphnia magna was also studied. The results showed that the adsorption process of MC-LR by SPM fitted well with the pseudo-second-order kinetic model and Freundlich isothermal adsorption model, and a maximum adsorption capacity of 1720μg/g was determined. This multimolecular layer adsorption dominated by chemical adsorption was relatively easy to occur. SPM-MC-LR influenced the immobilization rate (the maximum immobilization rate reached 93.77%) and the activity of antioxidant enzymes of Daphnia magna, with positively dose and time dependent manner. However, when the MC-LR content reached 73.52 and 94.53μg/g on the SPM surface, the oxidative stress triggered in the Daphnia magna would inhibit the activities of antioxidant enzymes. As a result, the activities of SOD and CAT after 48h exposure to SPM-MC-LR were decreased by 21.44%, 26.51% and 6.2%, 18.27% in comparison to that after 24h exposure, respectively. Compared with single MC-LR, the presence of SPM may enhance the toxicity of MC-LR toward Daphnia magna.
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Received: 28 July 2023
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Corresponding Authors:
李宏,教授,hongli@cqu.edu.cn
E-mail: hongli@cqu.edu.cn
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