Chemical Parameters

Basse Côte

(N = 22)

Korhogo

(N = 23)

P-value

Nitrites (mg/l)

Mean

0.33 ± 0.11

Median

0.32

Min.- Max.

0.07 - 0.60

WHO standard (2017)

3

Nitrates (mg/l)

Mean

12.08 ± 2.11

11.03 ± 3.18

0.2177

Median

9.21

6.51

Min.- Max.

1.04 - 41.30

0.62 - 65.80

WHO standard (2017)

50

COT (mg/l)

Mean

1.28 ± 0.32

0.56 ± 0.09

0.0092**

Median

0.69

0.41

Min.- Max.

0.34 - 5.48

0.30 - 1.51

WHO standard (2017)

2