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| Joint toxicity of cartap and Cr6+ to Eisenia foetida |
| Received:August 10, 2020 |
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| KeyWord:heavy metal;pesticide;composite pollution;joint toxicity;enzyme |
| Author Name | Affiliation | E-mail | | ZHU Yan | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | | | GAO Chen-xin | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | | | MENG Yu-ting | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | | | XIAO Xian | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | | | LIU Jian-guo | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | | | ZHAO Yuan | School of Environment & Safety Engineering, Changzhou University, Changzhou 213164, China | zhaoyuan@cczu.edu.cn |
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| Abstract: |
| Eisenia foetida was used as the test organism to investigate the joint toxicity of the heavy metal Cr6+ and the pesticide cartap on earthworms. Results showed that the single toxicity of cartap to Eisenia foetida was greater than that of Cr6+ and that their joint toxicity manifested antagonistic effects. While exposed to different pollutants, the physiological and biochemical properties of Eisenia foetida varied to different degrees. As the exposure time and concentration of cartap increased, the protein content of Eisenia foetida increased at the initial phase and then decreased. Superoxide dismutase(SOD) activity was induced in a short time and catalase(CAT) and malondialdehyde(MDA)contents increased during the initial stages of exposure and decreased significantly with time. When exposed to Cr6+ as a single pollutant, proteins and CAT in Eisenia foetida first increased and then decreased as the concentration of Cr6+ increased, and SOD concentrations were inhibited in the later stages as those of MDA continued to increase. The compounds of cartap and Cr6+ induced an increase in the protein content in Eisenia foetida, while SOD activity was promoted during the early stage and middle stage and inhibited in the late stage. CAT activity and MDA content increased and decreased, respectively, as the exposure time increased. These results show that SOD and MDA can be used as indicators to judge the degree of oxidative damage to Eisenia foetida. |
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