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首页> 外文期刊>Journal of environmental science and health >Deltamethrin degradation and effects on soil microbial activity
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Deltamethrin degradation and effects on soil microbial activity

机译：溴氰菊酯的降解及其对土壤微生物活性的影响

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摘要

Deltamethrin [(S)-cyano-3-phenoxybenzyl-cis-(lR,3R)-2,2-dimethyl) cyclo-propane carboxylate),l] labelled at gem-dimethyl groups of the cyclopropane ring was applied on two Egyptian soils at a level of 10 mg/kg soil for a laboratory incubation experiment under aerobic and anaerobic conditions. A steady decrease of soil extractable~(14)C-residues, accompanied by a corresponding increase of non-extractable bound ~(14)C-residues was observed over a 90-day incubation period. The percentage of evolved ~(14)CO_2 increased with time under aerobic and anaerobic conditions in both soils. The effect of deltamethrin on soil microorganisms as well as the counter effect of microorganisms on the insecticide was also investigated. As the incubation period increased, the inhibitory effect of the insecticide on the microorganisms decreased and the evolution of carbon dioxide depended on the applied dose. The nature of soil methanol soluble residues was determined by chromatographic analysis which revealed the presence of the parent insecticide as the main product in addition to four metabolites: 3-(2',2'-dibromovinyl)-2,2-dimethylcyclopropane carboxylic acid (Ⅱ); 3-phenoxybenzaldehyde (Ⅲ); 3-phenoxybenzoic acid (Ⅳ); 3-phenoxybenzyl alcohol (Ⅴ).
机译：将在环丙烷环的宝石二甲基上标记的溴氰菊酯[（S）-氰基-3-苯氧基苄基-顺-（1R，3R）-2,2-二甲基）环丙烷羧酸酯] l涂在两种埃及土壤上在需氧和厌氧条件下的实验室培养实验中，应以10 mg / kg的土壤水平施用。在90天的温育期内，土壤可提取的〜（14）C残留量稳定下降，而不可提取的〜（14）C残留量相应增加。在有氧和无氧条件下，两种土壤中〜（14）CO_2的释放百分比均随时间增加。还研究了溴氰菊酯对土壤微生物的影响以及微生物对杀虫剂的抵抗作用。随着潜伏期的增加，杀虫剂对微生物的抑制作用减弱，二氧化碳的释放取决于所施加的剂量。通过色谱分析确定了土壤甲醇可溶残留物的性质，该分析表明除四种代谢物外还存在母体杀虫剂作为主要产物：3-（2'，2'-二溴乙烯基）-2,2-二甲基环丙烷羧酸（ Ⅱ）; 3-苯氧基苯甲醛（Ⅲ）； 3-苯氧基苯甲酸（Ⅳ）； 3-苯氧基苄醇（Ⅴ）。

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