Table 2.

Correlation between geochemical characteristics.

	AsIII	AsTot	AsIIIr	FeII	FeTot	FeIIr	${\mathrm{NO}}_{\mathrm{3}}^{\mathrm{–}}$	${\mathrm{SO}}_{\mathrm{4}}^{\mathrm{2–}}$	${\mathrm{NH}}_{\mathrm{4}}^{\mathrm{+}}$	H2S	TOC	COND
AsTot	0.926ˆ**
AsIIIr	0.437ˆ*	0.286
FeII	0.123	0.253	0.209
FeTot	0.012	0.097	0.189	0.889ˆ**
FeIIr	0.243	0.326	0.230	0.232	-0.106
${\mathrm{NO}}_{\mathrm{3}}^{\mathrm{–}}$	0.013	0.100	-0.220	-0.008	0.264	-0.345
${\mathrm{SO}}_{\mathrm{4}}^{\mathrm{2–}}$	-0.270	-0.309	-0.039	0.162	0.295	-0.150	0.520ˆ*
${\mathrm{NH}}_{\mathrm{4}}^{\mathrm{+}}$	0.705ˆ**	0.688ˆ**	0.568ˆ**	0.106	0.001	0.295	-0.060	-0.130
H2S	0.086	0.039	0.025	0.004	0.104	-0.127	0.487ˆ*	0.333	0.318
TOC	0.892ˆ**	0.840ˆ**	0.284	-0.083	-0.173	0.142	0.001	-0.313	0.709ˆ**	0.161
COND	-0.351	-0.413	0.065	0.141	0.081	0.243	-0.094	0.629ˆ**	-0.107	-0.080	-0.459ˆ*
ORP	-0.092	-0.007	-0.291	-0.362	-0.248	-0.335	0.454ˆ*	0.171	-0.222	0.140	0.041	-0.335

^∗p < 0.05, ^∗∗p < 0.01.