Determination of Fenoxaprop-ethyl in Polished Rice and Brown Rice by HPLC

Abstract

A rapid and sensitive method for the determination of fenoxaprop-ethyl in polished rice and brown rice by HPLC was developed. The pesticide was extracted from samples with acetonitrile. For polished rice, the extract was evaporated to dryness. For brown rice, the fats in the extract were removed with hexane saturated with acetonitrile, and the acetonitrile layer was evaporated to dryness. The residues were dissolved in hexane, and the hexane solution was cleaned-up with a Sep-pak^® Florisil column. Recoveries of fenoxaprop-ethyl were 87.2-104.6% for polished rice and 88.3-108.3% for brown rice.
No pesticide was found in 6 polished rice and 41 brown rice samples from the U. S. A.. The detection limits of fenoxaprop-ethyl in polished rice and brown rice were both 0.01ppm.