Dissolved Concentrations, Sources, and Risk Evaluation of Selected Metals in Surface Water from Mangla Lake, Pakistan

Table 7

Principal component loadings for selected metals in summer and winter.

	Summer						Winter
	PC 1	PC 2	PC 3	PC 4	PC 5	PC 6	PC 1	PC 2	PC 3	PC 4	PC 5
Eigenvalue	3.8	2.3	1.6	1.4	1.3	1.0	3.2	2.2	1.9	1.5	1.2
% total variance	25	15	10	9.2	8.6	6.7	21	15	13	10	8.0
% cumulative variance	25	40	51	60	69	75	21	36	48	59	67
Ca	0.73	0.27	0.13	0.01	0.06	−0.20	0.91	−0.17	0.01	0.004	−0.09
Cd	−0.02	−0.06	0.71	0.17	−0.29	0.05	−0.17	−0.09	0.72	0.14	0.10
Co	0.07	−0.27	0.12	0.19	−0.34	0.49	−0.27	0.37	0.44	−0.16	0.22
Cr	0.10	0.19	−0.06	0.08	−0.19	0.89	−0.02	0.90	−0.08	−0.08	0.14
Cu	0.03	−0.10	0.14	0.82	0.19	0.13	0.44	0.27	0.11	−0.38	0.02
Fe	0.69	0.25	−0.15	0.001	0.19	−0.40	0.61	0.002	−0.01	0.28	0.21
K	0.46	0.49	0.10	0.48	0.03	0.26	−0.05	0.08	0.01	0.79	0.20
Li	−0.30	0.16	0.47	0.61	0.03	0.35	0.33	−0.21	−0.25	0.61	0.03
Mg	0.01	0.85	−0.19	0.01	0.13	−0.18	0.76	0.39	0.18	0.32	0.21
Mn	0.26	0.83	−0.07	−0.09	−0.21	0.03	0.06	−0.02	0.05	−0.02	0.81
Na	−0.15	0.87	−0.01	−0.06	0.11	−0.13	0.88	0.14	0.17	−0.19	−0.08
Ni	−0.03	−0.04	0.88	0.05	0.18	0.03	0.08	0.59	−0.33	−0.27	0.23
Pb	0.06	0.02	0.10	0.22	0.85	0.04	0.03	0.26	0.65	0.04	0.11
Sr	0.70	−0.02	−0.39	−0.04	0.17	−0.08	0.77	0.08	0.23	0.24	0.10
Zn	0.68	0.06	0.28	−0.54	0.02	0.04	−0.17	−0.21	−0.37	0.15	0.52