Geochemical modeling and multivariate statistical evaluation of trace elements in arsenic contaminated groundwater systems of Viterbo Area, (Central Italy)

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Table 7 Variable loadings to the first seven PCs for the groundwater samples from Monte Bisenzio area

Variable	PC1	PC2	PC3	PC4	PC5	PC6	PC7
Li	0.959	0.243	0.112	0.034	−0.014	0.013	−0.011
Be	0.848	0.285	−0.093	0.306	−0.163	−0.074	−0.089
B	0.966	0.147	−0.006	0.148	−0.071	−0.016	−0.103
Al	0.380	0.486	−0.511	0.052	0.335	0.402	0.279
V	−0.818	0.512	0.034	−0.150	0.029	−0.053	0.125
Cr	−0.559	−0.685	−0.036	0.291	0.305	0.113	−0.112
Mn	0.442	0.843	0.175	0.103	0.125	0.001	−0.067
Fe	−0.551	0.797	0.101	−0.053	−0.029	−0.024	0.002
Co	0.974	0.166	0.110	−0.032	−0.068	0.014	0.020
Ni	0.455	0.061	0.617	−0.380	0.299	0.356	−0.202
Cu	0.541	0.213	−0.441	−0.093	0.535	−0.382	−0.138
Zn	−0.575	0.764	0.101	−0.167	−0.061	−0.044	0.064
As	−0.171	0.622	0.137	0.717	0.005	0.143	−0.068
Se	0.216	−0.375	0.709	0.254	0.297	−0.266	0.290
Rb	0.966	0.111	0.094	−0.125	−0.104	0.002	0.109
Sr	0.979	0.175	0.026	−0.063	−0.024	−0.040	0.023
Mo	−0.436	0.883	0.080	−0.035	0.029	−0.093	−0.008
Sb	−0.827	0.478	0.090	−0.029	0.080	−0.105	−0.109
U	0.966	0.127	−0.071	−0.125	−0.039	−0.087	0.040
Eigenvalues	9.7	4.7	1.4	1.0	0.74	0.57	0.30
Variance %	51.3	24.8	7.7	5.4	3.9	3.0	1.6
Cumulative %	51.3	76.2	83.9	89.4	93.3	96.4	98.0