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建立了以正己烷振荡提取 ,以PCB2 和PCB2 0 9为内标的快速检测禽蛋中微量有机氯污染物的气相色谱法。与传统的索氏提取法相比 ,在保证足够的准确度、精确度和灵敏度的前提下 ,具有前处理简单、测试成本低、标本用量少的特点 ,而且可同时测定有机氯农药和典型的多氯联苯类化合物的残留 ,特别适于检测食品中的微量有机污染物。用该方法测试的结果表明 ,标准全蛋粉添加ng/g级待测物时 ,各种待测物的回收率为 84 31%～ 116 77% (3次测定平均值 ) ;相对标准偏差为 6 %～ 18% (7次测定平均值 ) ;最低检出量为 0 0 7ng/g～ 0 35ng/g。中国部分城市市售鸡蛋中的有机氯农药以p ,p′ DDE的检出量最高 ,p ,p′ DDT次之 ;多氯联苯的检出量很低 ,大多数样品中多氯联苯的总检出量低于 10ng/g。在所检出的多氯联苯中 ,绝大部分为含氯低的 (氯原子数为 3～ 5 )的氯化物。
Gas chromatography was developed for the rapid detection of trace organochlorine pollutants in poultry eggs by shaking with n-hexane and using PCB2 and PCB209 as internal standards. Compared with the traditional Soxhlet extraction method, with the premise of ensuring sufficient accuracy, accuracy and sensitivity, it has the advantages of simple pretreatment, low testing cost and less sample usage, and can simultaneously determine the organochlorine pesticides and the typical Residues of polychlorinated biphenyls are particularly suitable for the detection of trace organic contaminants in food products. The results of this method test showed that the recovery rate of various analytes was 84 31% ~ 116 77% (average of three determinations) when the standard whole egg powder was added with ng / g grade analyte; the relative standard deviation was 6% ~ 18% (7 times the average value); the lowest detection rate of 0 0 7ng / g ~ 0 35ng / g. The detection limit of organochlorine pesticides in commercial eggs in some cities in China was the highest among p and p ’DDE, followed by p and p’ DDT. The detection limit of PCBs was very low. The majority of PCBs The total detectable amount of less than 10ng / g. Among the PCBs detected, the majority of them are chlorides containing a low amount of chlorine (chlorine atoms of 3 to 5).