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首页> 外文期刊>Journal of environmental science and health >Persistence of herbicide fenoxaprop ethyl and its acid metabolite in soil and wheat crop under Indian tropical conditions
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Persistence of herbicide fenoxaprop ethyl and its acid metabolite in soil and wheat crop under Indian tropical conditions

机译：印度热带条件下土壤和小麦作物中除草剂fenoxaprop乙基及其酸代谢产物的持久性

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摘要

The persistence of fenoxaprop ethyl {Ethyl (RS)-2-[4-(6-chloro-1,3-benzoxazol-2-yloxy) phenoxy] propionate} herbicide and its active metabolite fenoxaprop acid was investigated in soil and wheat crop. Fenoxaprop acid was prepared by alkaline hydrolysis of fenoxaprop ethyl. A HPLC method was developed in which fenoxaprop ethyl herbicide and its acid metabolite showed sharp single peak at 6.44 and 2.61 min respectively. The sensitivity of the method for ester and acid was 2 and 1 ng respectively with limit of detection of 0.1 and 0.05 μg mL~(-1). The recovery of fenoxaprop ethyl and fenoxaprop acid from soil, wheat straw and grain ranged between 73.8-80.2%. In a field experiment fenoxaprop ethyl (Puma super~® 10 EC) when applied to wheat crop at the rate of 120 g and 240 g a.i. ha~(-1) as post emergence spray, fenoxaprop ethyl converted to fenoxaprop acid. Residues of fenoxaprop ethyl and acid dissipated in soil with a half-life of 0.5 and 7.3 days, respectively. At harvest no detectable residues of fenoxaprop ethyl or acid were observed in soil, wheat grain and straw samples.
机译：研究了土壤和小麦作物中的苯氧丙丙乙基{乙基（RS）-2- [4-（6-氯-1,3-苯并恶唑-2-基氧基）苯氧基]丙酸}除草剂及其活性代谢物苯氧丙酸的持久性。苯氧丙酸是通过苯氧丙酸乙酯的碱水解制备的。建立了一种HPLC方法，其中苯氧磷丙乙基除草剂及其酸代谢物分别在6.44和2.61分钟处显示出尖锐的单峰。该方法对酯和酸的灵敏度分别为2和1 ng，检出限为0.1和0.05μgmL〜（-1）。从土壤，麦秸和谷物中回收的苯氧丙酸乙酯和苯氧丙酸的回收率在73.8-80.2％之间。在田间试验中，以120 g和240 g a.i的比例将fenoxaprop乙基（Pumasuper®10 EC）应用于小麦作物。 ha〜（-1）作为出苗后喷洒，将苯氧沙丙乙酯转化为苯氧沙丙酸。苯氧磷丙酸和酸的残留物在土壤中的平均半衰期分别为0.5天和7.3天。在收获时，在土壤，小麦籽粒和稻草样品中均未观察到可检测到的非诺沙丙乙酯或酸残留物。

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