期刊
ENVIRONMENTAL RESEARCH
卷 209, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2022.112859
关键词
Chloroacetamide herbicides; Acetochlor; Anaerobic biodegradation; Catabolic pathway; Detoxification; Proteiniclasticum sediminis BAD-10(T)
资金
- National Natural Science Foundation of China [31871782]
Chloroacetamide herbicides (CAAHs) are widely used in agriculture but their mass applications have led to environmental contamination and toxicity. This study investigated the anaerobic degradation kinetics and metabolites of CAAHs, and found that a specific isolate could effectively degrade CAAHs and detoxify them. The research provides insights into the degradation pathway of CAAHs and highlights the potential use of a specific bacteria for bioremediation of CAAHs-contaminated environments.
Chloroacetamide herbicides (CAAHs) are important herbicides that were widely used to control agricultural weeds. However, their mass applications have seriously contaminated environment, and they are toxic to living beings. CAAHs are easy to enter anoxic environments such as subsoil, wetland sediment, and groundwater, where CAAHs are mainly degraded by anaerobic organisms. To date, there are no research on the anaerobic degradation of CAAHs by pure isolate and toxicity of anaerobic metabolites of CAAHs. In this study, the anaerobic degradation kinetics and metabolites of CAAHs by an anaerobic isolate BAD-10(T) and the toxicity of anaerobic metabolites were studied. Isolate BAD-10(T) could degrade alachlor, acetochlor, propisochlor, butachlor, pretilachlor and metolachlor with the degradation kinetics fitting the pseudo-first-order kinetics equation. The degradation rates of CAAHs were significantly affected by the length of N-alkoxyalkyl groups, the shorter the N-alkoxyalkyl groups, the higher the degradation rates. Four metabolites 2-ethyl-6-methyl-N-(ethoxymethyl)-acetanilide (EMEMA), N-(2-methyl-6-ethylphenyl)-acetamide (MEPA), N-2-ethylphenyl acetamide and 2-ethyl -N-carboxyl aniline were identified during acetochlor degradation, and an anaerobic catabolic pathway of acetochlor was proposed. The toxicity of EMEMA and EMPA for zebrafish, Arabidopsis and Chlorella ellipsoidea were obviously lower than that of acetochlor, indicating that the anaerobic degradation of acetochlor by isolate BAD-10(T) is a detoxification process. The work reveals the anaerobic degradation kinetics and catabolic pathway of CAAHs and highlights a potential application of Proteiniclasticum sediminis BAD-10(T) for bioremediation of CAAHs residue contaminated environment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据