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Background: 2TThe growing population and increasing needs to agricultural products increased use of pesticides resulting in contamination of the environment, including water. The purpose of this study was to 2Tdetermination2T of 2Tpesticide residues2T in agricultural water resources in Barzok city of Kashan in 2011. Materials and Methods: 2TThis study as a descriptive and cross-sectional study that was conducted at spring season. That totals of 135 samples of the agricultural water resources of Barzok were 2Tcollected2T randomly and mixtures from different stations. After extraction and preparation of samples, the 2Tpesticide residues2T were determined by using the HPTLC (High Performance Thin Layer Chromatography) devices and CATS4 software. Finally, obtained data were analyzed by using ANOVA statistical 2Tmethods2T. Results: 2TThe results of this study showed that maximum amount of diazinon and chlorpyrifos has been 22.43 and 11.79 ppm respectively, and the2T pesticide residues2T have declined gradually overtime of (p<0.001).Furthermore, after a month 95.9% of Chlorpyrifos and 88.8% of diazinon is degraded. Conclusion: 2TAccordingly, the remaining of diazinon and chlorpyrifos after a month of spraying was higher than determined limited standards. Because Chlorpyrifos is broken down rapidly more than diazinon, it is recommended that besides educating farmers on the proper use of pesticides, unnecessary contact with the water resources of this region must stop at least one month after spraying. [ABSTRACT FROM AUTHOR]

Abstract Diazinon is one of the most commonly used organophosphorus pesticides in agricultural activities, and its access to groundwater and surface waters damages the animal and plant environments. This study aimed to evaluate the applicability of the adsorption process for the removal of organophosphorus diazinon pesticide from water using multi-wall carbon nanotubes. Specifications of multi-walled carbon nanotubes were determined using FTIR, SEM, TEM and BET technologies. The effects of different parameters of pH (4 and 7), contact time (1–15 min), pesticide concentration (0.3, 0.5 and 1 mg/L) and multi-walled carbon nanotubes' dose (0.1 and 0.3 g/L) were evaluated on the process of removing diazinon by multi-walled carbon nanotubes. Based on the experimental data obtained in this study, maximum removal of diazinon (100%) from water by multi-wall carbon nanotubes are the initial concentration of diazinon (0.3 mg/L), 0.1 g/L concentration of nano-adsorbent at both pH of 4 and 7 at the contact time of 15 min. The results of the study showed that multi-wall carbon nanotubes can be used as effective and high efficient for complete removal of diazinon pesticides from aqueous solutions. Highlights • Diazinon is a serious threat to human health due to its effect on central nervous system. • Diazinon adsorption on multi-walled carbon nanotubes were conducted in a batch reactor. • Residual amount of diazinon poison in water samples was determined using TLC. • The surface morphology of MWCNs was determined by SEM and TEM. • The highest diazinon removal efficiency at pHs= 4 and 7 at 15 min contact time was 100%. [ABSTRACT FROM AUTHOR]