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Table 2 Principal component analysis of mineral elements in D. officinale

From: Element-tracing of mineral matters in Dendrobium officinale using ICP-MS and multivariate analysis

Item Principal component analysis
1 2 3
Zscore (Ti) 0.630 0.200 0.702
Zscore (V) 0.624 0.464 0.378
Zscore (Cr) −0.506 0.380 0.740
Zscore (Mn) 0.404 −0.751 0.380
Zscore (Fe) 0.699 0.546 −0.245
Zscore (Ni) 0.980 −0.090 −0.088
Zscore (Zn) 0.982 −0.031 −0.054
Zscore (Ba) 0.549 −0.779 0.031
Zscore (REE) 0.494 0.495 −0.330
λ 4.165 2.122 1.507
Proportion (%) 46.281 23.582 16.741
Cumulative proportion (%) 46.281 69.863 86.604