Monitoring for chlorpyrifos residues in animal feed and fodder of Tarai region of Uttarakhand, India.

In this study, residual concentrations of chlorpyrifos (CPF) were determined in feed (40) and fodder (25) samples collected from various locations of Tarai region of Uttarakhand. For extracting residues, liquid–liquid partition followed by alumina column clean up was used and the detection and quantification of residues was undertaken with the help of high-performance liquid chromatography using C18 column and diode array detector at 220 nm. Of the total 40 feed samples analyzed, 7 (17.5%) samples were found positive for CPF with the mean residual concentration of 0.058 µg g−1; while out of 25 fodder samples, CPF residues were detected in a single (4%) sample with residual concentration of 0.39 µg g−1. However, none of the feed or fodder samples contained CPF residues above the prescribed limit. [ABSTRACT FROM PUBLISHER]