Title : A Safety Survey on Pesticide Residues in Dried Agricultural Products
Abstract:
We performed a safety survey on residual pesticides in dried agricultural products. The total 110 samples of dried agricultural products, which were distributed in Gyeonggi-do in 2018, were analyzed for 263 pesticides by multi-class pesticide multi-residue methods by using gas chromatograph and liquid chromatograph. Also, we conducted a validation study about analysis method. The 10 kinds of pesticides were detected in 10 samples; Ricinus communis leaves, chwinamul, radish leaves, Cirsium setidens and pepper leaves. Chlorpyrifos was detected in Ricinus communis leaves, chlorpyrifos, hexaconazole, pyridalyl were detected in chwinamul, diniconazole, isoprothiolane, lufenuron were detected in radish leaves, hexaconazole was detected in Cirsium setidens, bifenthrin, chlorothalonil, boscalid, pyraclostrobin were detected in pepper leaves. The residue level in pesticides were 9.1%, among them one sample was detected over Maximum Residue Limit(MRL) and the unsuitable level in pesticide was 0.9%. In the validation study, the values of limit of detection (LOD), limit of quantification (LOQ), coefficient of determination(R2) and recovery were in the range of 0.002~0.027 mg/kg, 0.006~0.083 mg/kg, 0.9964~1.0000 and 74.8~118.9%, respectively. Positive List System (PLS) was newly introduced as part of the safety management of residual pesticide in agricultural products in Korea on 2019. With the application of PLS, if MRL is not established, 0.01 mg/kg is applied uniformly. In spite of strengthen of residue limit, MRLs of dried agricultural products are still insufficient. So this study would like to utilize as a basic data for setting the MRLs of them.
