CO-METABOLISM OF LOW CONCENTRATIONS OF PROPACHLOR, ALACHLOR, AND CYCLOATE IN SEWAGE AND LAKE WATER
CO-METABOLISM OF LOW CONCENTRATIONS OF PROPACHLOR, ALACHLOR, AND CYCLOATE IN SEWAGE AND LAKE WATER
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DOI：
10.1128/aem.49.4.737-743.1985
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发表时间：
1985-01-01
影响因子：
4.4
通讯作者：
ALEXANDER, M
中科院分区：
文献类型：
--
作者：
NOVICK, NJ;ALEXANDER, M
低浓度的丙草胺（2-氯-N-异丙基乙酰苯胺）和甲草胺[2-氯-2“，6”-二乙基-N-（甲氧基甲基）乙酰苯胺]没有矿化，环酯（S-乙基-N-乙基硫代环己烷氨基甲酸酯）缓慢或没有矿化，苯胺和环己胺在污水和湖水中很容易矿化。丙甲草胺、甲草胺和环草胺被广泛代谢，但产物是有机的。在消毒污水或湖水中，丙草胺和甲草胺的转化率很低。在湖泊水体中，丙草胺的彗星效应与时间基本呈线性关系，在较短时间内符合零级动力学，在较长时间内符合一级动力学。在63皮克/毫升到100纳克/毫升以上的浓度范围内，污水中的彗星率与丙草胺浓度成正比。葡萄糖而不是苯胺增加了在污水中的丙草胺彗星形成的产品的产量。没有微生物能够使用丙草胺作为碳和能量的唯一来源被分离，但从污水和湖水中分离的细菌代谢这种化学品。在这种除草剂的代谢过程中的2个细菌，没有C被同化。这些农药的彗星效应可能发生在天然沃茨中常见的合成化合物浓度下。
Low concentrations of propachlor (2-chloro-N-isopropylacetanilide) and alachlor [2-chloro-2'',6''-diethyl-N-(methoxymethyl)acetanilide] were not mineralized, cycloate (S-ethyl-N-ethylthiocyclohexanecarbamate) was slowly or not mineralized, and aniline and cyclohexylamine were readily mineralized in sewage and lake water. Propachlor, alachlor and cycloate were extensively metabolized, but the products were organic. Little conversion of propachlor and alachlor was evident in sterilized sewage or lake water. The cometabolism of propachlor was essentially linear with time in lake water and was well fit by zero-order kinetics in short periods and by first-order kinetics in longer periods in sewage. The rate of cometabolism in sewage was directly proportional to propachlor concentration at levels from 63 pg/ml to more than 100 ng/ml. Glucose but not aniline increased the yield of products formed during propachlor cometabolism in sewage. No microorganism able to use propachlor as a sole source of C and energy was isolated, but bacteria isolated from sewage and lake water metabolized this chemical. During the metabolism of this herbicide by 2 of the bacteria, none of the C was assimilated. Cometabolism of these pesticides may take place at concentrations of synthetic compounds that commonly occur in natural waters.