Geofluids

Research Article

A Regional Scale Investigation on Groundwater Arsenic in Different Types of Aquifers in the Pearl River Delta, China

Table 3

Principal component loadings for groundwater samples in fissured aquifers.


Item	PC1	PC2	PC3	PC4	PC5	PC6

pH	0.237	0.237	0.754	−0.108	−0.211	−0.120
EC	0.944	0.138	0.044	0.079	−0.025	0.040
DO	−0.399	−0.140	−0.033	−0.350	−0.505	0.018
Eh	0.037	−0.354	−0.531	−0.056	−0.156	−0.242
K⁺	0.876	0.011	0.055	−0.051	−0.171	−0.077
Na⁺	0.846	0.166	−0.072	0.197	0.146	0.220
Ca²⁺	0.788	0.474	0.250	0.063	0.067	0.067
Mg²⁺	0.758	0.130	−0.049	0.103	0.163	−0.021
	−0.010	0.115	0.053	0.902	−0.093	0.162
Fe	−0.146	−0.076	0.024	−0.054	0.831	0.104
	0.563	0.619	0.357	0.161	0.214	−0.043
Cl⁻	0.893	0.003	−0.132	0.118	0.065	0.240
	0.832	0.076	0.212	0.036	−0.153	−0.200
F⁻	0.046	0.434	0.225	−0.298	−0.019	0.006
	0.818	−0.146	−0.243	−0.097	−0.145	0.274
TDS	0.930	0.300	0.127	0.076	0.073	0.073
TH	0.840	0.433	0.202	0.076	0.093	0.053
I⁻	0.292	0.232	0.050	0.572	0.361	−0.130
	0.276	0.865	−0.003	0.060	0.043	−0.119
Al	0.077	0.074	−0.817	−0.075	−0.090	−0.021
Mn	0.499	−0.289	−0.065	0.433	0.234	−0.291
	0.250	−0.058	0.051	0.065	0.092	0.865
As	0.085	0.797	0.044	0.402	−0.147	0.050
Eigenvalue	8.3	2.9	2.0	1.9	1.4	1.2
Explained variance (%)	36.3	12.7	8.5	8.1	6.3	5.3
Cumulative% of variance	36.3	48.9	57.5	65.6	71.8	77.1