Evaluation of pesticide residues 2,4-D, atrazine and Alachlor concentration in drinking water well of Mahidasht district-Kermanshah, Iran, 2010-2011

Nowadays, Pesticides include2,4-D, Artazine andAlachlortoxins among chemical compounds extremely used in different issueespeciallyagainstthe weed plant. However, Theirpenetrating into the environmentas well water sources lead to severe health impactand environmental problems.According tothe useof pesticides in agricultural land in Kermanshah as well as considerable extraction of ground water by the locals, it enter into water wells. Therefore, the use of pesticides in the province could be a serious threat for drinking water resources. The present study aim was determining the concentration of pesticide residues (2,4-D, Atrazine and Alachlor) in ground water sources of the Mahidasht district in Kermanshah. In this study a total of 120 water samples was collected from 5 deep water wells in Mahidasht areasof Kermanshah whiten 2010-2011. The samples were measuredin term of pesticide residues using dispersive liquid-liquid micro extraction and HPLC instrument. The obtained results showed that the highest concentration of 2,4-D and Alachlortoxin were 58.2 and 26.7 (μg/L) ppb, respectively. Therefore, it was more than the standard level suggested by the World Health Organization (WHO)and Industrial Researches Standard of Iran. Statistical analysis using One-way ANOWA indicated that there were significant differences between average concentration of samples based on different seasons and area (P