Assessment of pesticide contamination in drinking water resources: A case study in the rural regions of Malekan

Abstract

Introduction Although significant part of the world is covered with water, little amount of this water is accessible (2.6%). Groundwater, in case of physicochemical and biological aspects, is in good condition. Population growth, industries expansion and pollutants production are threatening water quality. Pesticides are considered a threat to water resources. Malekan County's water because of high potential for agriculture, uncontrolled use of pesticides and juxtaposition of water resources to orchards and farms, is exposed to pollution. Therefore, the aim of this study was to evaluate water resources pollution to agricultural pesticides in villages of the county. Materials and Methods Sampling was done from 39 water resource for two times. Highly consumed toxins such as Trifloraline, Diazinon, Methil Parathion, Fenitrotion, Malation, Dorsban, Profenfus, Endosfulan, and Deltametrin, ……. Were measured using GC/MS model Agilent-7890A. Data interpretation was done using spss19 and 0.05 was considered significant level. Results Maximum concentration of trifloraline, diazinon, methyl parathion, fenitrotion, malation, dorsban, profenfus, endosfulan, and deltametrin were 0.199, 0.614, 0.321, 0.189, 0.456, 0.0001, 0.542, 0.538 and 0.104 μg/l , respectively. According to Iran's guideline, concentrations of trifolarine (20 μg/l) and dorsban (30 μg/l) are in the accepted range. Conclusion Comparisons of the results with European standards for each of the toxins indicated that trifloraline, diasinon, methyl paratione, fenintrotin, malathion, prophenphus, Endosulphan and deltamethrine in 2.5, 12.8, 7.7, 48.7, 17.9, 2.5, 10.2, 5.1 percent of the samples have concentrations above the maximum allowable level, respectively. No significant correlation between residual concentration of toxins with depth and well recharge was observed (p>0.05).