Chlorpyriphos and isoprocarb residues in the soil and food crop at agricultural area of Citarum watershed

The residue of chlorpyriphos and isoprocarb pesticides is a prominent issue related to food safety due to their hazard to human health and environmental quality. A study to observe the level of pesticides in soil and food crops in an agricultural area was conducted in the Citarum watershed. The soil and edible parts of food crop samples were collected from 40 and 34 locations, respectively. The results showed that chlorpyriphos residue in soil was detected at five locations, which were 12.5% of all observation areas. The minimum, maximum and average concentrations of chlopyriphos were 0.0018 mg/kg, 0.0046 mg/kg, and 0.0030 mg/kg, respectively; below the maximal chlorpyriphos residue threshold in soil (0.1250 mg/kg). Chlorpyriphos residue was detected in the edible part of food crops grown in the 12 locations (35.3% of all studied locations) with the minimum, maximum and average concentrations of 0.0049 mg/kg, 0.9147 mg/kg, and 0.2963 mg/kg, respectively. The concentration of chlorpyriphos residue that was higher than the maximum residue limit (0.01 mg/kg) was detected in snaps, potato, shallot, and paddy samples collected from 10 locations. Isoprocarb residue was not detected in soil but was noticed in food crops grown in two locations with concentrations were 0.0117 and 0.0335 mg/kg. The concentration of isoprocarb residue that was higher than the maximum residue limit (0.03 mg/kg) was detected in paddy samples collected from one location. According to the data, it should any effort to minimize chlorpyriphos and isoprocarb residue in food crops through good application practices of pesticides.