Table 3 Chemical analysis of water samples collected from the sampling points

Total hardness

mg/L

1 3.20 + 1.25^b

13.40 + 1.10^b

12.05 + 1.05^a

13.50 + 1.25^b

12.70 + 1.15^a

13.20 + 0.58^b

150

Dissolved oxygen

mg/L

5.80 + 0.20^a

6.43 + 0.21^ab

6.96 + 0.57^bc

6.47 + 0.31^abc

6.83 + 0.45^bc

7.23 + 0.55^c

5

COD

mg/L

36.00 + 2.00^b

36.67 + 3.06^b

43.67 + 17.67^b

44.67 + 17.01^b

35.60 + 3.17^b

16.67 + 1.15^a

1000

BOD

mg/L

26.00 + 2.00^b

21.00 + 3.60^ab

24.00 + 9.54^b

24.00 + 5.29^b

17.67 + 4.51^ab

12.00 + 1.00^a

0.0

Calcium

mg/L

19.00 + 1.00^a

18.67 + 1.52^a

20.67 + 2.51^a

21.00 + 2.64^a

18.67 + 2.08^a

18.33 + 2.52^a

75

Magnesium

mg/L

0.53 + 0.06^b

0.57 + 0.15^b

0.40 + 0.10^ab

0.47 + 0.15^ab

0.33 + 0.06^a

0.32 + 0.03^a

50

Sulphate

mg/L

13.67 + 0.58^bc

15.00 + 1.00^c

12.67 + 0.58^b

12.65 + 0.56^b

12.33 + 0.57^b

10.67 + 1.53^a

100

Nitrate

mg/L

2.50 + 0.11^b

2.61 + 0.18^b

2.52 + 0.15^b

2.58 + 0.15^b

2.71 + 0.15^b

1.93 + 0.07^a

50

Chloride

mg/L

37.00 + 1.00^c

34.67 + 3.06^bc

35.67 + 1.53^c

34.67 + 2.31^bc

31.33 + 1.53^b

26.67 + 2.30^a

250