쑥갓(Chrysanthemum coronarium L.)에 처리된 살충제 Methoxyfenozide에 대한 몇 가지 설정기준
Establishment of Criteria for Methoxyfenozide on Crown Daisy (Chrysanthemum coronarium L.)
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본 연구는 쑥갓(Chrysanthemum coronarium L.) 재배지에 살충제 methoxyfenozide를 기준량과 배량으로 살포한 후 경시적으로 채취하고 식물체 중 잔류량 측정을 통한 생물학적 반감기를 조사하여 생산단계 허용기준 설정을 위한 기초자료로 활용하고자 하였다. 쑥갓 시료는 methoxyfenozide를 표준처리량과 배량으로 처리한 후 14일에 걸쳐 8번(2시간, 1, 2, 3, 5, 7, 9 및 14일)채취하였다. Methoxyfenozide는 acetonitrile로 추출하여 dichlorometane으로 분배한 후 PDA가 장착된 UPLC로 분석하였다. Mehtoxyfenozide의 정량한계는 0.02 mg/kg 이었고 회수율은 0.2와 1.0 mg/kg의 수준에서 각각 80.0과85.1% 이었다. 생물학적 반감기는 기준량과 배량 처리에서 각각 5.7과 5.6일 이었다. Methoxyfenozide가수확전 10일에 쑥갓에 처리되면 수확 시 잔류량은 최대잔류허용량 미만으로 검출될 것으로 예상된다. 그러므로 쑥갓에 처리된 살충제 methoxyfenozide의 잔류량은 물론, 정량분석한계 및 생물학적 반감기 등의자료는 식물체 및 농약의 증거물로서 비교대상의 표준자료로 활용될 수 있을 것으로 기대된다.
Abstract
This study was conducted to investigate the biological half-life and the pre-harvest residue limit ofinsecticide methoxyfenozide in crown daisy(Chrysanthemum coronarium L.). Methoxyfenozide was sprayed withrecommended and double recommended rate on crown daisy during cultivation period. Samples were collectedover 14 days, 8 times in total (2hr and 1, 2, 3, 5, 7, 9, 14 days). Methoxyfenozide was extracted with acetonitrileand partitioned with dichloromethane, and analyzed using an UPLC/PDA. Limit of quantitation (LOQ) ofmethoxyfenozide was 0.02 mg/kg, and the recoveries at two fortification levels of 0.2 and 1.0 mg/kg were80.0 and 85.1%, respectively. The biological half-life of methoxyfenozide was about 5.7 and 5.6 days atrecommended and double recommended rate, respectively. If methoxyfenozide were practically applied to crowndaisy at 10 days before harvesting, the final residue level was predicted to be lower level than maximum residuelimit. Therefore, the results were expected to applied to survey data of comparison target that residue ofmethoxyfenozide, method quantitation limit and biological half-life as evidence of plant and pesticide.
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