Effects of adsorption on degradation and bioavailability of metolachlor in soil
Effects of adsorption on degradation and bioavailability of metolachlor in soil
复制标题
吸附对土壤中异丙甲草胺降解和生物有效性的影响
DOI：
10.4067/s0718-95162011000300007
复制
发表时间：
2011
影响因子：
3.9
通讯作者：
S.N. Li3
中科院分区：
文献类型：
--
作者：
X.M.Wu1;2;M. Li 1*;Y.H. Long1;2;R.X. Liu2;Y.L. Yu3;H. Fang3;S.N. Li3
土壤吸附异丙甲草胺的能力对其环境归宿有很大的影响，但关于土壤吸附与降解和生物利用度之间的关系的资料很少。研究了异丙甲草胺在5种不同性质土壤中的吸附、降解和生物有效性，探讨了土壤吸附对异丙甲草胺降解和生物有效性的影响。异丙甲草胺在供试土壤上的吸附系数为0.36 ~ 1.18 μ g1-nmLng-1，呈弱吸附，随水体的上升，其吸附量有下降的趋势.吸附符合Freundlich吸附等温式，吸附量与土壤有机质含量呈正相关（p < 0.01）。异丙甲草胺在土壤中的降解符合一级动力学，半衰期为37.9 ~ 49.5 d，土壤有机质含量对半衰期有显著影响（p < 0.01）。灭菌处理延长了异丙甲草胺在土壤中的半衰期，表明生物降解是异丙甲草胺在土壤中降解的主要途径。土壤理化性质是影响赤子霉对异丙甲草胺吸收和积累的主要因素，其中有机质的影响最为显著。吸附系数与异丙甲草胺的半衰期（p < 0.01）和生物累积因子（p < 0.05）呈负相关，表明吸附系数可用于预测异丙甲草胺在土壤中的降解和生物有效性。
The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. Metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 μg 1-n mL n g -1 , suggesting its potential to move downward with percolating water. Adsorption followed a Freundlich isotherm and was positively correlated with soil organic matter (OM) content (p < 0.01). Degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil OM content (p < 0.01). The prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. Uptake and bioaccumulation of metolachlor in soils by Eisenia foetida was also mainly controlled by soil properties, especially OM. Adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
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影响因子：
11.4
作者：
D. Armstrong;G. Chesters
通讯作者：
D. Armstrong;G. Chesters
DOI：
10.1002/chin.200418292
发表时间：
2004-05
期刊：
ChemInform
影响因子：
--
作者：
R. Lanno;J. Wells;J. Conder;Karen D. Bradham;N. Basta
通讯作者：
R. Lanno;J. Wells;J. Conder;Karen D. Bradham;N. Basta
DOI：
10.1007/s10112-000-0001-4
发表时间：
2000-04
期刊：
Sciences of Soils
影响因子：
--
作者：
A. Spongberg;Lou Ganliang
通讯作者：
A. Spongberg;Lou Ganliang
影响因子：
11.4
作者：
Kalkhoff, SJ;Kolpin, DW;Barcelo, D
通讯作者：
Barcelo, D
影响因子：
8.8
作者：
Jixin Tang;H. Liste;M. Alexander
通讯作者：
Jixin Tang;H. Liste;M. Alexander