Multivariate Analysis of Confined Groundwater Hydrochemistry of a Long-Exploited Sedimentary Basin in Northwest China

Table 4

Loadings of variables on 4 significant varifactors (VFs) of water quality measurements.

Variable	VF1	VF2	VF3	VF4
TDS	0.97	0.16	−0.11	0.07
Cl	0.90	−0.13	0.05	0.25
Na	0.90	−0.29	−0.20	0.15
	0.85	0.18	−0.17	0.12
Ca	0.78	0.25	0.21	−0.26
TH	0.62	0.73	0.11	−0.15
HCO3	0.36	0.71	−0.23	−0.36
K	0.20	0.58	0.55	−0.10
Mg	−0.05	0.92	−0.12	0.11
F	0.29	−0.74	−0.31	−0.11
NO3	−0.14	−0.05	0.85	0.06
NH4	0.24	0.01	0.03	0.92
Eigenvalue	4.60	2.99	1.33	1.20
% of variance explained	38.3	24.9	11.1	10.0
% cumulative variance	38.3	63.2	74.3	84.3