Environmental Engineering Reference
In-Depth Information
Fig. 1
Map showing the Lagos Lagoon
Table 1
Physico-chemical properties of water samples from the Lagos Lagoon
Sampling points
WHO limit
Parameter
Q
R
S
COW
PAL
Dissolved oxygen (mg O
2
/l)
4.7-6.3
3.7-5.4
3.4-5.0
6.2-6.5
6.1-6.4
-
BOD (mg O
2
/l)
11.8-30.4
16.8-24.4
22.2-34.2
16.2-28.6
14.2-20.6
0
Total hardness (mg CaCO
3
/l)
191.8-2,057.3
146.8-1,783.8
149.1-916.3
65.8-102.8
21.5-96.2
-
Total Alkalinity (mg CaCO
3
/l)
61.5-01.7
74.9-9.0
80.3-91.0
42.7-60
32.3-40
-
a
-9.3
Acidity (mg CaCO
3
/l)
3.0-11.7
2.5-12.8
5.5-7.0
5.1-6.5
-
Chloride (mg/l)
798.9-14,819
1520.6-11,752
283.5-12,722.7
587.2-5,541
432.8-1,318.2
250
Sulphate (mg/l)
303.6-2,432.9
343.4-22,430
32.0-2,343
43.2-1,220
87.6-93.9
-
Phosphate (mg P/l)
0.2-0.4
0.1-0.3
0.2-0.3
0.1
0.1
1.0
Conductivity (lScm
-1
)
24 000-410,000
21,000-315,000
3,000-330,000
2,500-170,000
1,300-60,000
-
pH
6.9-8.2
6.9-7.8
6.9-7.5
7.0-7.2
7.2-7.4
6.5-8.5
Total solids (mg/l)
3,100-30,870
3,910-25,630
2,080-23,780
1,720-11,080
980-3,070
500
Total dissolved solids (mg/l)
2,000-28,580
3,070-24,060
1,500-21,850
850-10,840
240-1,220
500
a
Not detected
Q Iddo, R Oko-Baba, S Oworonshoki, COW five cowrie, PAL Palaver Island
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