Spectrophotometric method for quantification of fenoxaprop p-ethyl herbicide in commercial formulations and agricultural samples. | [Journal of Chemical Society of Pakistan • 2010]

Author(s):

1. Jasmin Shah: Institute of Chemical Sciences, University of Peshawar, NWFP, Pakistan

2. Muhammad Rasul Jan: Institute of Chemical Sciences, University of Peshawar, NWFP, Pakistan

3. Farhat-Un-Nisa Shehzad: Institute of Chemical Sciences, University of Peshawar, NWFP, Pakistan

4. Mian Muhammad: Institute of Chemical Sciences, University of Peshawar, NWFP, Pakistan

Abstract:

A simple spectrophotometric method was developed for determination of fenoxaprop p-ethyl herbicide in agricultural samples. The method is based on the acid hydrolysis of fenoxaprop pethyl to form 6-chloro-2,3-dihydrobenzoxazol-2-one (CDHB) and ethyl 2-(4-hydroxyphenoxy) propionate (EHPP). The 6-chloro-2,3- dihydrobenzoxazol-2-one was used as a coupling reagent in diazotization reaction. The absorbance of the azo dye was measured at 430 nm. The reaction conditions were optimized for hydrolysis as well as for the diazotization reaction. The Beer`s law was obeyed over the concentration range of 0.2-25 ug mL-1 with molar absorptivity of 1.4 x 104 L mol-1 cm-1. The limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.029 and 0.093,ug mL-1, respectively. The method has been successfully applied to the determination of fenoxaprop p-ethyl I commercial formulations and various agricultural samples. The % recoveries were found in the range of 95-97%.

Page(s): 537-541

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 32, Issue: 4, Year: 2010

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