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含油脂的食品中,残留杀虫剂的萃取和净化是个难题。萃取液中有脂肪会干扰气相色谱测定,需要增加净化步骤,这样,便影响了回收率和延长了分析时间。作者用氧化铝一次萃取,移去脂肪获得成功。用弗罗里西土净化后的萃取液适用于气相色谱分析。低于4％脂肪的乳样,称取50g置于粉碎杯中,加氧化铝20g(如果氧化铝有显著干
Grease-containing foods, residual pesticide extraction and purification is a problem. The presence of fat in the extract interferes with gas chromatographic determination and requires an additional purification step, thus affecting the recovery rate and extending the analysis time. The author once extracted with alumina, remove the fat to be successful. Purified Florisil extracts are suitable for gas chromatographic analysis. Less than 4% fat emulsion, weighed 50g crushed cup, add 20g of alumina (if the alumina is significantly dry