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Monitoring of heavy metals contamination in agricultural products at abandoned mine area
Eun-hee Chang(장은희),Mi-jeong Gwon(권미정),Hwang-ran Hwang(황향란),Eun-mo Jeong(정은모) 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
This study was carried out to risk assessment of lead(Pb), cadmium(Cd), and inorganic arsenic(I-As) contamination in agricultural products at abandoned mine area in 27 crops including rice and vegetables. The 269 typical investigation sites located in Bongwha-gun area were selected by considering the heavy metal levels, that had been known that the amount of the heavy metals exceeded the contamination level based on the previous survey. The various samples were collected and performed using microwave device and ICP/MS in lead and cadmium(n=1,059). Inorganic arsenic was treatment of 1% nitric acid and using HPLC-ICP/MS(n=365). The Limit of detection(LOD), Limit of quantification(LOQ), and correlation coefficient(R²) for heavy metals were 0.19-0.66 μg/kg, 0.19-0.65 μg/kg, and 0.9998-1.0000, respectively. Conclusively, it requires to consider the critical levels of heavy metals agricultural products due to unexpectedly high levels in few places while amount of heavy metals in the samples were relatively low in most areas.
안재민(Jae Min An),신수정(Su Jung Shin),김민기(Min Gi Kim),황향란(Hyang Ran Hwang),장순영(Soon Young Chang),김인숙(In Sook Kim),권미정(Mi Jung Kwon),박대한(Dae Han Park),이광희(Gwang Hee Lee) 한국농약과학회 2019 농약과학회지 Vol.23 No.2
The present study was carried out to investigate dissipation characteristics and half-lives of four insecticides (etofenprox, pyrifluquinazon, spirotetramat and sulfoxaflor) in cow parsnip (Heracleum moellendorffii L.), which is one of minor crops. The insecticides were applied to cow parsnip at two different treatment levels: dose recommended as a safe use guideline and its doubled dose. Cow parsnip samples for residue analysis were harvested eight times 0, 1, 2, 3, 5, 8, 10, and 14 days after the insecticide application. Extraction and purification processes of insecticide residues in samples were based on a QuEChERs method, and their quantitative analysis was done using LC-MS/MS. Recoveries of tested insecticides in cow parsnip ranged from 84.9 to 110.6%, with limits of quantification of 0.01 mg/kg and coefficients of variation of < 5%. Based on first-order kinetics, dissipation half-lives of etofenprox, pyrifluquinazon, spirotetramat, and sulfoxaflor in cow parsnip were 2.7, 1.8, 3.0, and 2.4 days, respectively. Dissipation constants obtained in this study may be utilized in future studies for setting the pre-harvest residue limits that can ensure the safety of post-harvest cow parsnip from insecticide residues.
안재민(Jae Min An),장순영(Soon Young Chang),임현지(Hyun Ji Lim),박재옥(Jae Ok Park),김인숙(In Sook Kim),황향란(Hyang Ran Hwang),박대한(Dae Han Park),김익로(Ik Ro Kim),강민구(Min Gu Kang) 한국농약과학회 2020 농약과학회지 Vol.24 No.1
This study was conducted to experiment on decrease residue patterns of 7 pesticides in Korean melon after washing and peeling. The test pesticides diluted by recommended dose and double recommended dose were sprayed one time and then samples were collected at the 1 days (24 hours) after spray days. The pesticides were extracted with QuEChERS method and residues were analyzed by LC-MS/MS and GC-MS/MS. Method LOQ in 7 pesticides were 0.01 mg/kg (limit detected 0.025 ng) and recoveries of test pesticides in Korean melon found to be 81.6-109.0%. The matrix matched calibration curves for 7 pesticides in Korean melon yielded good linearity (r² > 0.991). As results, removal rates after washing; dimethomorph 58.0% > propamocarb 31.8% > fluopicolide 31.0% > thiamethoxam 25.6% > chlorfenapyr 22.0% > fluopyram 19.6% > dinotefuran 16.4%, and after peeling; propamocarb 96.6% > dimethomorph 94.5% > fluopicolide 81.5% > dinotefuran 80.5% > thiamethoxam 79.8% > fluopyram 75.9%, respectively. Based on the results of this study, it may provide a basic safety information for the management of health from pesticide residues in agricultural products.