不同海星中微量元素的主成分分析及聚类分析

Principal Component Analysis and Clustering Analysis of Trace Elements in Different Asteroidea

建立了微波消解-电感耦合等离子体质谱法(ICP-MS)测定海星样品中Cr、Co、Ni、Cu、Zn、As、Se、Cd和Pb元素含量的实验方法 ,对我国山东、辽宁和江苏等7个省份海星样品中微量元素的含量进行了测定,并运用SPSS11.5对实验数据进行了主成分分析和聚类分析。结果表明海星中Cd和Cr的平均含量均超出了我国食品安全限量标准值(GB2762-2012)。通过主成分分析发现,前3个主成分累积方差贡献率超过60%,得出Zn、Se、Ni和As为海星的特征性元素,并且对特征性元素人体摄入量进行了初步分析。同时利用特征性元素对所测样品进行系统聚类分析,结果发现当欧式距离为25.0时,所测样品聚为海燕和海盘车两大类,依照此类聚类分析方式,样品还可以聚为5大类和8大类,通过分析结果表明聚类依据大部分取决于海星的品种。

The paper set up a new method to determine the concentrations of trace elements in Starfish samples in 7 different places The samples digested by microwave digestion,and trace elements amounts of Cr,Co,Ni,Cu,Zn,As,Se,Cd and Pb in samples solutions were determined by inductively coupled plasma mass spectrometry（ICP-MS）. The principal components analysis and cluster analysis of SPSS11.5 were applied to the study of experiment data. The result showed that the average concentrations of Cd and Cr in Starfish samples were more than those national limited values（GB2762-2012）,Besides,the principal component analysis showed that three principal components accounted for more than 60%,and Zn,Se,Ni and As were characteristic elements in Starfish samples. In addition,It also preliminarily analyzed human intake of characteristic elements,According to those characteristic elements,the result of clustering analysis showed that the samples could be reasonably clustered into two groups,including swallow and starfish,when the Euclidean distance was 25.0. These samples could also be divided into five categories and eight categories by such analysis methods. The analyzed result showed that the clustering analysis was partly based on the difference in varieties. Therefore,it was more important to consider genetic reasons while choosing Starfish,The research provided the development and utilization of Starfish with important information.