Period

Rainy Season (October 2020)

Dry Season (March 2021)

Standard Limit

Parameters

Min

Max

Mean

Med

SD

Min

Max

Mean

Med

SD

WHO Standard (2017)

Benin Standard (2001)

Cl⁻ (mg/L)

5.01

156.05

26.25

13.51

29.88

2.30

152.30

34.64

29.75

32.51

250

250

${\text{HCO}}_3^{-}$ (mg/L)

6.10

294.50

66.93

26.20

80.27

2

565.80

74.03

25.43

117.09

250

ND

${\text{NO}}_3^{-}$ (mg/L)

0

85.35

21.74

10.81

25.76

0

80.58

22.52

8.13

27.02

50

45

${\text{SO}}_4^{2-}$ (mg/L)

0

93.60

10.27

3.48

17.51

0

85.80

10.02

5.38

15.44

250

500

Ca²⁺ (mg/L)

0.71

107.26

25.21

9.28

31.36

2.01

187.80

31.54

10.33

47.70

75

100

Mg²⁺ (mg/L)

0.44

29.79

7.16

4.36

6.67

0.49

35.21

6.26

4.32

6.72

50

50

K⁺ (mg/L)

0.01

26.32

4.17

1.02

6.56

0.24

49.42

5.60

2.03

9.62

12

ND

Na⁺ (mg/L)

0.07

96.20

15.04

8.90

18.43

1.30

95.53

19.24

17.91

17.15

200

ND

Mg²⁺/Ca²⁺

0.06

2.73

0.62

0.48

0.52

0.03

1.42

0.43

0.37

0.33

_

_

Dureté totale

5.36

358.20

88.81

39.55

96.51

9.01

613.87

104.88

44.65

136.48

_

_