Spectrophotometric method for the determination of fenoxaprop-p-ethyl herbicide in wheat and barley grains using charge transfer complex. | Sarhad Journal of Agriculture 2012

Author(s)

Farhat-un Nisa Shehzad College of Home Economics, University of Peshawar, Peshawar, Pakistan

Jasmin Shah Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan

Muhammad Rasul Jan Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan

Abstract

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 ?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 4.2x10 4 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 µg mL-1 . The percent recovery for determination of fenoxaprop-p-ethyl in commercial formulations was found to be 84±0.067 –98±0.060 %. The limit of detection and quantific ation was found to be 0.20 µg mL-1 and 0.67µg mL-1 respectively.

Publication Details

Page(s) 63-68

DOI DOI not available

Published Journal: Sarhad Journal of Agriculture, Volume: 28, Issue: 1, Year: 2012

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