Geomorphologic Unit/ Parameters

Coastal Alluvium, Mangrove and Freshwater Swamp-Port Harcourt Diobu

Saltwater Swamp-Isaka/ Dutch Island

WHO Standard

WS1

WS2

WS3

WS4

WS5

WS6

WS7

WS1

WS2

WS3

Physical/ organoleptic

Appearance

Reddish yellow

Clear

Turbidity NTU

0.2

2.6

0.1

0.3

2.21

0.423

3.26

29

15

5

Odour

Unobj

Obj

Obj

Obj

Unobj

Taste

Unobj

Obj

Obj

Obj

Unobj

Temperature (˚C)

25.8

28.7

25.1

25.3

29.3

28.2

25.8

28.5

25 - 30 (Ambient)

Chemical

Conductivity uscm

178.1

330

38.3

218.1

12.63

482

2.79

6200

88.3

48.3

250

pH

7.2

3.7

5.6

5.9

6.8

6.18

5.75

6.2

6.27

6.1

6.5 - 8.5

Chlorides as NaCl

10.34

25.1

7.1

83.43

104

30

1709

341.6

111.6

250

Total alkalinity as CaCO₃

12

-

8

8

38

90

10

8

10

Total hardness

148

15.3

16

58

2.08

56

20

100

161

8

100

Magnesium Hardness as MgCO₃ mg/l

0.74

0

16

8

20

Calcium hardness mg/l

6.7

20

125

90

150

Total Iron as Fe mg/l

0.028

0.135

<0.001

<0.001

0.02

0.024

0.02

<0.001

10.9

1.09

0.3

Nitrates ${\text{NO}}_{\text{3}}^{-}$

0.5

0.82

0.9

10.8

4.1

1.2

19.3

8.5

10

Sulphate ${\text{SO}}_{\text{4}}^{-}$

1

3.3

1

9

3.2

0.672

100

33

41

250

Phosphate

0.03

<0.05

2

1.5

1.02

0.16

250

Total dissolved solids TDS

95

228

18

183.5

110

321.3

1.42

3410

57.4

24.2

500

Total suspended solids

4

4

8

4

2

_

8

33

21

25

Salinity

0.15

10

0.1

2000

250

Cu mg/l

0.217

0.055

0.049

<0.01

<0.001

1

Ca mg/l

8.112

3.8

<0.001

9.092

3.09

18.777

70

Mg mg/l

5.484

1.4

<0.001

2.675

0.12

100.006

30

K mg/l

7.38

36.2

38.122

200

Na mg/l

4

8

574.17

200

Pb mg/l

<0.001

0.05

<0.001

<0.01

<0.001

0.05

Zn mg/l

<0.001

0.025

0.017

0.08

0.056

<0.001

3

Mn mg/l

<0.001

<0.001

0.417

0.166

0.104

0.5

Cd mg/l

<0.001

<0.001

<0.001

<0.001

0.003

Cr mg/l

<0.001

<0.001

<0.001

<0.01

<0.001

0.05