Determination of Trace Elements in Species of Citrus from Different Growing Areas by Microwave Digestion-ICP-MS and Their Difference Analysis
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Abstract:
The contents of eight mineral elements (Na, K, Mg, Mn, Ca, Fe, Zn and Cu) in citrus of different species (“chun jian”, “buzhihuo”, “maoguogan”) were studied. 27 samples of three varieties were collected from 9 producing areas in four provinces. Eight mineral elements in the samples were detected by inductively coupled plasma mass spectrometry after microwave digestion. At the same time, the principal component analysis (PCA) and cluster analysis method were adopted to analyze mineral elements content of differences between different varieties. The results showed that the contents of the constant element potassium in the samples of the three citrus varieties were the highest, all above 1000 mg/kg, accounting for more than 60% of the total contents of the eight elements. The results of principal component analysis showed that the variance contribution rate of the first two principal components was 72.4%. K, Mg, Zn, Cu, Mn and Fe were the characteristic elements of different varieties and citrus of origin. The results of cluster analysis showed that there were differences in mineral element content of samples from different producing areas in the same variety. The difference of element content caused by varieties was obviously greater than that caused by the environment of producing area.
