Pesticide Residue Analysis Laboratory Department of Entomology, Punjab Agricultural University, Ludhiana-141 004, India, < sksahoo_2006@rediffmail.com>
The estimation of chlorpyrifos and lindane residues were done by a multiresidue analytical methodology employing GC-FTD and GC-ECD systems with capillary columns and confirmed by GC-MS. The limits of quantification (LOQ) for both the compounds were found to be 0.01 µg g−1. The mean initial residues of chlorpyrifos were 8.99, 9.19 and 8.99 µg kg−1, respectively at dry, irrigated and flooded soil. Whereas the corresponding values for lindane were 9.52, 9.22 and 9.29 mg kg−1, respectively. The results revealed that chlorpyrifos persisted for longer period under dry conditions whereas lindane was found to persist more under irrigated conditions.
Insecticides, Persistence, Residues
