Hydrochemistry and Entropy-Based Groundwater Quality Assessment in the Suining Area, Southwestern China
Table 2
Statistical results of hydrochemical parameters and drinking water standards.
Parameters
Max
Min
Mean
SD
CV (%)
Guideline
% of SEL
pH
8.4
7.10
7.6
0.25
3.37
6.5-8.5
0.00
TDS
830
201
563
140
24.90
1000
0.00
TH
550.50
160.14
389.99
89.04
22.83
450.00
17.86
K+
25.00
0.90
3.75
4.77
126.98
—
—
Na+
78.00
8.70
31.66
14.81
46.76
200
0.00
Ca2+
184.40
46.10
118.68
30.67
25.85
75
92.86
Mg2+
42.60
6.10
22.75
8.68
38.14
50
0.00
Cl−
90.50
7.20
30.62
22.98
75.06
250
0.00
SO42−
207.00
45.90
93.60
42.20
45.09
250
0.00
HCO3−
530.90
140.30
348.31
89.41
25.67
—
—
NO3−
244.00
0.20
68.12
61.42
90.17
50
50.00
NO2−
6.05
0.01
0.43
1.41
327.39
0.02
18.57
NH4+
1.53
0.03
0.23
0.30
129.05
0.2
11.43
F−
0.6
0.2
0.4
0.10
27.16
1.0
0.00
SD, standard deviation; CV (%), coefficient of variation; Chinese Guidelines [32]; WHO Guidelines [33]; % of SEL, % of samples exceeding the acceptable limit.
