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| Degradation characteristics and ecological risk of chlorpyrifos and results of its degradation in dryland soils |
| Received:February 22, 2020 |
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| KeyWord:chlorpyrifos;TCP;soil environment;ecological risk |
| Author Name | Affiliation | E-mail | | LIU Han-bing | Technical Center for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment of the People's Republic China, Beijing 100012, China
Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | WANG Dong-qi | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | XUE Nan-dong | Technical Center for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment of the People's Republic China, Beijing 100012, China
Chinese Research Academy of Environmental Sciences, Beijing 100012, China | xuend@craes.org.cn | | DENG Yan-ling | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | YUAN Xue-hong | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| The environmental pollution risk of chlorpyrifos and TCP in dryland soils is getting increased attention. Chlorpyrifos and TCP distribution characteristics after the application of chlorpyrifos in the field areas of corn, wheat, and soybean crops were discussed, and their environmental risks concerning soil pollution were assessed. After its application, it was observed that chlorpyrifos in soils removed quickly in the early stage and its spread gradually slowed down. The half-life of chlorpyrifos in wheat, soybean, and corn-growing soils was 7.86 d to 24.84 d(all<30 d)and the digestion rate constant was 0.027 9 d-1 to 0.088 2 d-1. In the early stage, chlorpyrifos residue is highest in the 0~5 cm soil layer and lowest in the 15~20 cm soil layer. With the increase in the depth of soil, chlorpyrifos residue gradually decreased. The residue of chlorpyrifos in the 10~20 cm layer of soil gradually increased in later stages. Furthermore, TCP is more liable to be removed, and thus the risk of environment pollution is high. With the increase in the dosage of chlorpyrifos, short-term and long-term ecological risks of chlorpyrifos and TCP showed an increase in the soils growing wheat, soybean, and corn crops. When the superrecommended dosage was administered to the these three crops, chlorpyrifos and TCP had higher short-term and long-term ecological risks, with the TCP ecological risk reaching maximum risk level in all the three crops. |
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