Multivariate-Statistical Assessment of Heavy Metals for Agricultural Soils in Northern China

Table 1

Total variance and component matrixes (three factors selected) for heavy metals.

(a) Total variance explained

Component	Initial eigenvalues			Extraction sums of squared loadings			Rotation sums of squared loadings
	Total	% of variance	Cumulative %	Total	% of variance	Cumulative %	Total	% of variance	Cumulative %
1	2.700	33.752	33.752	2.700	33.752	33.752	2.187	27.338	27.338
2	1.464	18.304	52.056	1.464	18.304	52.056	1.639	20.484	47.822
3	1.264	15.797	67.853	1.264	15.797	67.853	1.602	20.030	67.851
4	0.893	11.160	79.013
5	0.630	7.871	86.884
6	0.479	5.987	92.871
7	0.362	4.523	97.394
8	0.208	2.600	100.000

(b) Component matrixes

Element	Component matrix			Rotated component matrix
	PC1	PC2	PC3	PC1	PC2	PC3
Cu	0.838	0.231	0.117	0.648	0.585	0.086
Zn	0.804	0.236	−0.325	0.875	0.207	0.008
Ni	0.549	−0.593	0.335	0.125	0.367	0.785
Pb	0.317	0.028	0.727	−0.153	0.756	0.182
Cr	0.692	−0.355	−0.148	0.565	0.114	0.544
Hg	−0.041	0.850	0.101	0.085	0.319	−0.791
As	0.428	0.381	0.380	0.205	0.637	−0.156
Cd	0.536	0.096	−0.572	0.771	−0.166	0.013