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建立了气相色谱-同位素稀释质谱法测定乳粉和液态乳中三聚氰胺含量的方法。样品加入同住素稀释剂后,经乙腈/水提取,取10mL上清液于Waters Oasis MCX固相革取柱净化,氮气吹干,70℃衍生化后,进行GC/MS分析,单点法测定。对进样口温度和前处理条件进行了优化研究,并测定了5个液态乳和5个乳粉的实际样品,并对测定结果的不确定度进行了评估。该方法的最小检出限为10μg/kg,原料乳的回收率为95.7%-96.3%,RSD小于4.15%,乳粉中三聚氰胺的回收率为70.2—103.2%,RSD小于6.87%。 相似文献
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The determination method of 4 organochlorine pesticides in tea by GC/MS was established. The extraction effectiveness of analytes with different extraction methods(shaking extraction and ultrasonic extraction) and different shaking time(40, 60 and 80 min) was compared. The results showed that shaking extraction 40 min was superior to other shaking time and ultrasonic extraction. This method is suitable to determine pyrethroid pesticides in tea. 相似文献
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