Table 2.

Pearson’s (r) and Spearman’s (r_s) correlation coefficients among As and other chemical and physical-chemical parameters. Positive correlations are highlighted on a green scale, negative correlations on a red scale. Statistically significant values in bold (α = 0.05).

Parameter	North		South
	r	rs	r	rs
Eh	0.083	−0.175	−0.255	−0.338
T	0.185	0.109	0.291	0.318
pH	0.291	0.379	0.242	0.302
DO	−0.066	−0.040	−0.618	−0.619
Cond	−0.066	0.183	0.156	0.121
F	0.658	0.690	0.741	0.805
Cl	−0.157	−0.121	−0.167	−0.180
PO4	−0.107	0.025	−0.223	−0.301
SO4	−0.327	−0.264	0.288	0.449
HCO3	0.165	0.261	0.161	0.161
Na	0.216	0.280	0.630	0.488
K	0.055	0.194	0.541	0.542
Mg	−0.250	−0.172	−0.356	−0.449
Ca	−0.076	0.241	−0.105	−0.225
Al	0.002	0.036	−0.070	0.213
Mn	−0.189	0.028	0.034	0.244
Fe	0.114	−0.040	0.156	−0.013
U	0.613	0.536	0.230	0.399
Li	0.230	0.326	0.711	0.686
B	0.366	0.111	0.365	0.497
V	0.533	0.574	−0.326	−0.309
Ni	−0.217	−0.041	−0.116	0.011
Cu	−0.192	−0.324	0.083	0.029
Zn	0.397	0.060	−0.219	−0.195
Ba	0.045	0.003	−0.161	−0.177