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

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Table 5 Variable loadings to the first seven PCs for the groundwater samples from Monte Jugo area

Variable	PC1	PC2	PC3	PC4	PC5	PC6	PC7
Li	0.541	0.833	−0.012	0.039	−0.013	0.079	−0.077
Be	−0.771	0.242	−0.083	0.555	−0.045	−0.176	0.002
B	0.779	0.476	0.201	0.320	0.095	0.085	0.082
Al	−0.752	0.267	0.588	−0.105	−0.029	−0.067	0.027
V	−0.425	0.778	0.146	−0.408	−0.124	−0.094	0.053
Cr	−0.878	0.194	−0.362	−0.243	0.003	−0.046	0.010
Mn	−0.697	0.346	0.603	0.042	−0.085	0.144	0.026
Fe	−0.979	0.117	−0.148	−0.019	−0.029	0.002	0.073
Co	0.334	0.934	0.017	−0.029	0.063	−0.082	−0.060
Ni	−0.926	0.170	0.039	−0.006	0.322	0.090	0.020
Cu	−0.972	0.141	−0.135	−0.037	0.101	0.066	−0.028
Zn	−0.927	0.111	−0.323	−0.098	0.114	0.036	0.029
As	0.838	0.484	0.104	−0.106	−0.013	0.080	0.188
Se	0.921	−0.208	−0.122	−0.253	−0.012	0.087	−0.145
Rb	−0.480	0.835	−0.161	0.116	−0.052	0.085	−0.154
Sr	0.802	0.561	−0.181	0.088	−0.031	−0.003	−0.024
Mo	0.617	0.504	−0.583	−0.073	0.065	−0.095	0.084
Sb	−0.760	−0.031	−0.565	0.127	−0.221	0.176	0.075
U	0.982	−0.092	−0.132	0.028	0.032	0.025	0.087
Eigenvalues	11.575	4.311	1.817	0.780	0.224	0.163	0.129
Variance %	60.920	22.691	9.565	4.107	1.181	0.856	0.679
Cumulative %	60.9	83.6	93.1	97.2	98.4	99.3	100