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

Table 3

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

Sampling sites	Indexes
	K^+	Na^+	Ca^2+	Mg^2+		Cl^-		Mn	As
ND-1 (2015)	2.20	5.66	62.00	3.41	173.85	4.71	34.21	0.07210^−3	11.310^−3
ND-2 (2015)	2.90	7.94	65.00	4.33	170.80	6.82	38.76	0.410^−3	11.310^−3
ND-3 (2015)	1.11	4.85	76.00	4.24	195.20	3.83	35.77	<0.0610^−3	1.310^−3
ND-4 (2015)	2.17	6.59	69.00	3.48	158.60	5.62	34.29	<0.0610^−3	11.410^−3
ND-5 (2015)	1.33	2.64	72.00	4.47	140.30	2.60	45.42	0.1710^−3	3.6210^−3
ND-6 (2015)	1.90	5.93	70.00	3.31	176.90	4.90	32.82	0.110^−3	1110^−3
ND-7 (2015)	0.44	0.98	72.00	2.27	201.30	1.64	12.67	<0.0610^−3	<0.0910^−3
ND-8 (2015)	1.58	1.98	69.00	4.47	140.30	2.41	61.52	0.9710^−3	4.9310^−3
Average of ND-1~ ND-8	1.70	4.57	69.38	3.75	169.66	4.07	36.93
Max of Reference [6]	2.64	1.74	65.68	8.82	236.42	6.47	60.78	0.59	0.04