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利用激光诱导击穿光谱(LIBS)分析方法具有的快速无污染优势,选择有代表性的病死猪为研究对象,探讨LIBS对病死猪中残留重金属元素的预测可行性。为了消除水分和有机基体对LIBS分析灵敏度的影响,对病死猪采取高温热解炭化前处理,分别比较了健康猪肉鲜样、健康猪肉真空抽湿压片样和病死猪热解炭化压片样在320~440 nm范围的LIBS光谱信息。结果显示,猪肉中含有丰富的Ca等矿质元素及有机质成分C,N等;真空抽湿可以消除水分的影响从而提高LIBS分析重金属的灵敏度,而热解炭化可以大大减弱含水量和有机质成分对金属元素的干扰,能够探测出更多的元素谱线信息,同时进一步提高重金属Cu,Pb和Cr的检测灵敏度。表明LIBS能对解热炭化病死猪中的残留重金属成分进行探测,并有望结合化学计量学分析方法实现猪肉中重金属含量的快速检测。
The advantage of quick and pollution-free analysis by LIBS was analyzed. Representative pigs were selected to study the feasibility of LIBS in predicting the residual heavy metals in the dead pigs. In order to eliminate the influence of moisture and organic matrix on the sensitivity of LIBS analysis, the pyroprocessed charcoal pre-treatment of dead pigs were compared. Fresh pork samples of healthy pork, vacuum pumped tablets of healthy pork and pyrolyzed charcoal tablets of diseased pigs were compared LIBS spectral information in the 320-440 nm range. The results showed that pork was rich in Ca and other mineral elements and organic matter components such as C, N, etc .; vacuum dehumidification can eliminate the impact of moisture to improve the sensitivity of LIBS analysis of heavy metals, pyrolytic carbonization can greatly reduce the water content and organic matter composition of the metal Element interference, to detect more elemental spectral information, while further improving the detection sensitivity of heavy metals Cu, Pb and Cr. It indicates that LIBS can detect the residual heavy metals in the pyrolyzed carbonized diseased pigs and is expected to be able to detect the heavy metals in pork meat rapidly with chemometric analysis.