Study of Selected Metals Distribution, Source Apportionment, and Risk Assessment in Suburban Soil, Pakistan

Table 3

Principal component loadings of selected metals in soil in summer and winter.

	Summer			Winter
	PC1	PC2	PC3	PC1	PC2	PC3	PC4
Eigen value	2.8	2.3	1.5	2.3	1.8	1.5	1.2
% total variance	36	25	17	25	21	17	13
% cumulative variance	36	61	78	25	46	63	76
Cd	0.80	−0.13	−0.20	−0.18	−0.08	0.76	−0.21
Co	0.87	−0.07	0.07	0.05	0.12	0.90	0.10
Cr	0.84	0.04	0.19	0.75	0.20	0.30	0.19
Cu	−0.24	0.17	0.88	0.35	0.07	0.14	0.79
Fe	0.17	0.68	−0.02	−0.03	0.87	−0.07	−0.23
Mn	−0.36	0.82	0.11	0.88	−0.06	0.03	−0.09
Pb	0.77	−0.31	0.02	0.14	0.00	0.77	0.09
Sr	0.91	0.08	−0.02	0.74	0.09	0.33	0.07
Zn	0.31	−0.12	0.83	−0.38	0.08	−0.19	0.85