Variation Characteristics of the Main Hydrochemical Indexes in Typical Subterranean Rivers in the South China Karst Region Based on Curve Fitting

Table 2

Comparison of the main indexes in the Jila subterranean river basin (mg.L^-1).

Sampling sites	Indexes
	Ca^2+				Mn	Hg
JL-1 (2015)	92.00	0.00	43.17	9.00	<0.0610^−3	0
JL-2 (2015)	90.00	0.04	41.30	7.89	<0.0610^−3	0
JL-3 (2015)	92.00	0.00	44.82	18.60	<0.0610^−3	0
JL-4 (2015)	82.00	1.94	57.78	14.02	<0.0610^−3	0
JL-5 (2015)	78.00	3.36	56.51	20.64	<0.0610^−3	0
Average of JL-1~ JL-5	86.80	1.07	48.72	14.03	<0.0610^−3	0
Max of Reference [14]		3.14	81.34	18.19	0.28
Max of Reference [15]	99.16		76.95		0.52	0.01