Rapid determination of organophosphorus pesticides in onion and welsh onion by homogenization of frozen sample in dilute phosphoric acid
Rapid determination of organophosphorus pesticides in onion and welsh onion by homogenization of frozen sample in dilute phosphoric acid
复制标题
冷冻样品稀磷酸均质快速测定洋葱和大葱中的有机磷农药
DOI：
10.3358/shokueishi.33.543
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Chonan
中科院分区：
文献类型：
--
作者：
T. Chonan
建立了一种同时测定洋葱和大葱中30种有机磷农药的简便、快速方法。将样品切成小块，置于含有稀磷酸的混合杯中，然后均质化。均质样品中的农药用丙酮水溶液提取。真空浓缩提取物，用NaCl溶液稀释，用己烷再提取。采用ULBON HR-1毛细管色谱柱，火焰光度检测器，用气相色谱法测定了洋葱和大葱提取物中的农药残留。洋葱和大葱中除敌敌畏外，其它农药的回收率均在77%以上，在0.1μg/g浓度范围内均达到了标准。敌敌畏的回收率为60%。农药的检出限为0.003 ~ 0.04μg/g。
A simple and rapid method for the simultaneous determination of 30 kinds of organophosphorus pesticides in onion and welsh onion was developed.First of all, the sample to be analyzed was frozen to inactivate enzymes. The sample was cut into pieces, placed in a mixer cup containing dilute phosphoric acid and then homogenized. Pesticides in the homogenized sample were extracted with aqueous acetone. The extract was concentrated in vacuo, diluted with NaCl solution and reextracted with hexane. The pesticides were determined by gas chromatography with a flame photometric detector using the capillary column of ULBON HR-1.No interfering peak was found on the gas chromatograms of onion and welsh onion extracts. The recoveries of pesticides from onion and welsh onion at levels of 0.1μg/g were more than 77%, except for DDVP. The recoveries of DDVP were 60%. The detection limits of pesticides ranged from 0.003 to 0.04μg/g.