The assessment of Diazinon, Carbaryl and Azinphous metyl pesticides Residue in the rivers of Qom, Iran in 2016

Given the widespread use of pesticides to preserve crops, their retention in the environment is inevitable. Agricultural development and the use of various pesticides in Qom province can affect the aquatic ecosystem for a long time. The aim of this study was to determine the residual concentrations of organophosphorus pesticides azinfus methyl and diazinon and carbamate carbohydrate toxin in water of major rivers of Qom province.

In this study, 144 water samples were collected from 4 main rivers of Qom during 12 consecutive months in 2016. For determination of these pesticides, two methods (solid- phase extraction and Liquid-Liquid extraction) were adopted and samples were analyzed by means of HPLC and GC/MS applying standard methods.

Final results showed that the most concentration of Diazinon, Carbaryl and Azinphos metyl pesticides were found to be about 24.5 ppb (part per billion), 14.52 and 4.54 ppb in summer respectively. The minimum concentration of the three pesticides was detected in winter. According to the statistical test Two - Way ANOWA there were significant differences among pesticides concentrations in the water samples in different seasons (p<002).

The findings of present study had shown that pesticides residue concentration in water samples is more than standard level. As a result of the continuous use of these pesticides in the agricultural activity, these emissions can be a serious threat to public health.