Korean Journal of Environmental Agriculture (한국환경농학회지)
- Volume 14 Issue 3
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- Pages.312-318
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- 1995
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- 1225-3537(pISSN)
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- 2233-4173(eISSN)
Assessment of the Residues of Benfuresate and Oxolinic Acid in Crops
Benfuresate와 Oxolinic Acid의 작물체중 잔류량 평가
- Park, Dong-Sik (College of Agriculture, Kangwon National University) ;
- Yang, Jae-E. (College of Agriculture, Kangwon National University) ;
- Han, Dae-Sung (College of Agriculture, Kangwon National University)
- Published : 1995.12.30
Abstract
Residues of benfuresate in rice and oxolinic acid in Chinese cabbage were determined through the field experiments in order to establish the safe use and the maximum residue limit(MRL) of these pesticides in Korea. The herbicide benfuresate powder was sprayed into the paddy field with a level of 0.6kg(active ingredient)/ha and rice (Oryza sativa L.) was grown. At harvest, residues of benfuresate in brown rice and stem were analyzed using gas chromatograph. The residue of oxolinic acid in Chinese cabbage (Brassica campestris subsp. napus var pekinesis MAKINO) was analyzed using HPLC after foliar-spraying this fungicide into the cabbages at a level of 15kg/ha. The recovery efficiencies of benfuresate and oxolinic acid were 87-89% and 90-95%, respectively. The respective residues of benfuresate in rice and oxolinic acid in Chinese cabbage were in the range of 0.27-0.46 mg/kg and 0.23-1.53kg/kg. Residual concentrations of these pesticides in crops increased with the increased application frequencies, followed the first-order kinetics and linearly decreased with time. The highest residue of 1.53 mg/kg of oxolinic acid was observed when this fungicide was sprayed six times until three days prior to harvest, but this level was far lower t㏊n 5 mg/kg, which is the maximum residue limit(MRL) set by FAO/WHO.
본 실험은 수도체중의 benfuresate 잔류량과 배추중의 oxolinic acid 잔류량을 정량하여 이들 농약의 안전사용 기준설정및 최대 잔류 허용량 설정을 위한 기초자료를 얻기위하여 수행하였다. 논 토양에 benfuresate 입제를 0.6 kg a.i./ha의 수준으로 처리한 후 수도체를 재배, 수확한 후 현미와 볏짚 시료 중 benfuresate 잔류량을 정량하였으며, 배추 중 oxolinic acid의 잔류량 측정을 위해 각 처리구 당 15 kg a.i./ha의 수준으로 수확전 45, 30, 21, 15, 7, 3일에 배추에 직접 경엽 살포하였다. 본 실험에서 얻은 결과를 요약하면 다음과 같다. 1. 수도체와 배추 중의 benfuresate와 oxolinic acid의 회수율은 각각
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