Spectrophotometric method for the determination of fenoxaprop-p-ethyl herbicide in wheat and barley grains using charge transfer complex
2012
Farhat-un-Nisa, S. (Peshawar Univ. (Pakistan). Coll. of Home Economics) | Shah, J. (Peshawar Univ. (Pakistan). Inst. of Chemical Sciences) | Jan, M.R. (Peshawar Univ. (Pakistan). Inst. of Chemical Sciences)
A simple and sensitive spectrophotometric method was developed for determination of fenoxaprop-p-ethyl herbicide in food samples. The method is based on acid hydrolysis of fenoxaprop-p-ethyl it gives the product 6-chloro-2, 3-dihydrobenzoxazol-2-one (CDHB) and ethyl 2-(4-hydroxyphenoxy) propionate (EHPP).The 6-chloro-2, 3-dihydrobenzoxazol-2-one (CDHB) was reacted with Fe (II) to form yellow color complex. Its lambda max was found to be 430nm. The influences of various experimental parameters on the absorbance of the charge transfer complex of fenoxaprop-p-ethyl with Fe (II) are studied. The absorbance of complex was measured at 430 nm. The charge transfer complex of herbicide with Fe (II) shows molar absortivity 4.2x104 L. mol-1 cm-1. Analytical parameters were optimized and successfully applied to the determination of fenoxaprop-p-ethyl in various samples. The method shows a linear range from 2-24 mug mL-1. The percent recovery for determination of fenoxaprop-p-ethyl in commercial formulations was found to be 84 plus minus 0.067-98 plus minus 0.060 %. The limit of detection and quantification was found to be 0.20 mug mL-1 and 0.67mug mL-1 respectively.
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