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Agricultural chemical residues in paddy field is the source of environmental pollution affecting the health of farmers, livestock and consumers. The concentration of agricultural chemical residues collected from water at the wet broadcasting paddy fields in Wat-sing and Hun-kha district of Chai Nat province. Forty-five samples in each district were collected by completely randomized design and analyzed with Liquid Chromatography/Mass Spectrophotometry (LC/MS) techniques for volume and type of residues. The risk value resulting from the exposing to chemical was identified and the spatial distribution maps of risk areas was produced by Geographic Information System (GIS). The research revealed that Herbicide, Fungicide, Carbamate and Organophosphate were found in both districts with different level of concentration. In addition, another group of chemicals Organochlorine was only found in Hun-kha district. The concentration found level of agricultural residues is higher than the standard level, Acceptable Daily Intake (ADI value). For the study on risk assessment with GIS to investigate the average health risk from the chemical residues collected from water (mg/kg day bw) within the radius of 250 meters around the village locations, it was found that the high-risk substances appeared in all communities were Diazinon and Diuron. Methomyl, Thiaclopid and Pendimethalin were at medium risk whereas Glyphosate, Ametryn, Thiabendazole and Metalaxyl were at low risk.
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