農產品中草殺淨殘留量標準檢驗方法之建立

ESTABLISHMENT OF STANDARD ANALYTICAL METHOD FOR THE DETERMINATION OF AMETRYN IN CROPS

本研究係進行除草劑草殺淨於農產品中殘留量檢驗方法之探討與建立。草殺淨以丙酮自作物中抽出，以二氧甲烷萃取，經減壓濃縮，定容後，以氣相層析配合DB-17毛細層析管柱及NPD （Nitrogen Phosphorus Detector）檢出器偵測之；並根據衛生署公告之安全容許量標準，以蕃石榴及甘蔗為試驗作物進行三重覆之回收試驗。經檢驗結果顯示：於蕃石榴及甘蔗中添加0.05～0.75ppm檢體濃度之平均回收率，依序為89.7～91.4%及89.2～90.8%。草殺淨添加於甘蔗之最低檢出量為0.01ppm。

An simple and efficient method is presented for the extraction, purification, and gas chromatography (GC) with NPD (nitrogen phosphate detector) and a capillary column of DB-17 to determine ametryn in crops. Residues of ametryn was extracted from crops with acetone, partitioned into dichloromethane, and determined by GC-NPD subsequent to purification. Recovery studies were performed at 0.05 ~ 0.75 ppm fortification levels, and recoveries ranged from 89.2 ~ 91.4%. The corresponding detection limit in crops was 0.01 ppm.