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| Effect of Two Biochars on Leaching and Migration of Atrazine in Two Soils |
| Received:July 11, 2014 |
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| KeyWord:atrazine;sandy soil;clayey soil;biochar;leaching |
| Author Name | Affiliation | E-mail | | CAO Mei-zhu | School of Environment, Guangxi University, Nanning 530004, China | | | ZHANG Chao-lan | School of Environment, Guangxi University, Nanning 530004, China | zhangcl@gxu.edu.cn | | PAN Li-ping | Agricultural College, Guangxi University, Nanning 530004, China | | | YANG Wei-wei | School of Environment, Guangxi University, Nanning 530004, China | | | WEI Jia-ming | School of Environment, Guangxi University, Nanning 530004, China | | | ZHANG Fei-long | School of Environment, Guangxi University, Nanning 530004, China | | | WEI Yan-hong | School of Environment, Guangxi University, Nanning 530004, China | |
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| Abstract: |
| Herbicides in soils can easily enter the surface water and groundwater through run off and leaching, leading to water pollution. A simulation experiment was performed to study the effects of biochar amendments on the transport of atrazine in soils. Two biochars, sugarcane top(BCst) and silkworm excrement(BCse), were produced under pyrolysis temperature at 500 ℃ and limited oxygen. The biochars were added at 0.2% and 0.5% rates to two soils, sandy soil and clay soil, pre-polluted with 10 mg·kg-1 atrazine. Biochar addition changed the basic physiochemical properties of soils. Soil organic carbon(SOC) and cation exchange capacity(CEC) were significantly increased by biochars, compared with the control. Biochars inhibited the transport of atrazine in soil, with greater effects in BCst than in SCse. The stronger adsorption and less transport of atrazine were observed in the soils with higher biochar additions. The leaching rate of atrazine was greater in sandy soil than in clayey soil. Correlation analysis suggested that SOC and CEC in the top soil(0~5 cm) had significantly negative relationship with the content of atrazine in the subsoil(15~20 cm) and the leaching of atrazine into groundwater. These results suggest that biochars could be used as artificially adsorbent to efficiently control the migration and leaching of atrazine in soils. |
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