Analysis of Pesticides in Water Samples and Removal of Monocrotophos by γ-IrradiationIsmail M1,2*, Murtaza Sayed1, Hasan M Khan1 and William J Cooper2
- *Corresponding Author:
- Muhammad Ismail
NCE in Physical Chemistry
University of Peshawar
Peshawar 25120, Pakistan
E-mail: [email protected]
Received date: December 04, 2013; Accepted date: January 11, 2014; Published date: January 14, 2014
Citation: Ismail M, Sayed M, Khan HM, Cooper WJ (2014) Analysis of Pesticides in Water Samples and Removal of Monocrotophos by γ-Irradiation. J Anal Bioanal Tech 5:181. doi: 10.4172/2155-9872.1000181
Copyright: © 2014 Ismail M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The analysis of 20 organochlorine pesticides has been carried out in surface water samples collected from Peshawar, KPK, Pakistan, using SPME-GC-ECD method. This method showed good liner response with R2 values in the range of 0.9933 to 0.9999 for all pesticides. Percent recoveries at 1 μg L-1 for all the pesticides ranged from 89.9 to 106.1%. A total of 59 surface water samples were tasted for 20 organochlorin pesticides residues, of which, 37 samples were found contaminated with γ-BHC, 12 samples with β-BHC, 25 samples with heptachlor and 25 samples with aldrin with a maximum concentration of 0.092, 0.053, 0.089 and 0.036 μg L-1, respectively. However other pesticides were found in lesser no. of water samples. The Gamma irradiation decomposition of monocrotophos aqueous solution at various concentrations (60-150 mg L-1) was carried out and their removal efficiency was investigated. Gamma irradiation showed 100% degradation for a 60 mg L-1 solution at an absorbed dose of 1200 Gy. The dose constants investigated in this study ranged from 1.4×10-3 to 3.0×10-3 Gy-1. The effect of saturated solutions of N2 and N2O, and radical scavengers such as tert-butanol and iso-propanol, on the degradation of monocrotophos were also studied. The results showed that degradation of monocrotophos mainly proceeded through oxidative •OH radical. The inorganic by-products NO3-, NH4+ and PO43- were quantitatively determined by ion chromatography. A detail mechanism pathway of monocrotophos degradation by irradition has been developed.