Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 48, Issue 5, Pages 324-330Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2013.742363
Keywords
Fenoxaprop ethyl; acid metabolite; residues; HPLC; wheat; soil
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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 2.61min respectively. The sensitivity of the method for ester and acid was 2 and 1ng respectively with limit of detection of 0.1 and 0.05g mL1. The recovery of fenoxaprop ethyl and fenoxaprop acid from soil, wheat straw and grain ranged between 73.880.2%. In a field experiment fenoxaprop ethyl (Puma super (R) 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 7.3days, respectively. At harvest no detectable residues of fenoxaprop ethyl or acid were observed in soil, wheat grain and straw samples.
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