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Table 3 Average values of physico-chemical parameters of cultivated, polluted and non polluted sites sampled in Douala and Yaoundé from January to December 2010.

From: Anopheles gambiae distribution and insecticide resistance in the cities of Douala and Yaoundé (Cameroon): influence of urban agriculture and pollution

 

Douala

Yaoundé

Cultivated areas

Non Polluted

Polluted

P value

Cultivated areas

Non Polluted

Polluted

P value

N

12

68

50

 

53

54

41

 

Alcalinity

35.3 ± 11.1

117.3 ± 3.8

125.2 ± 5.84

0.1

136.9 ± 5.6

184.7 ± 5

201.1 ± 6.9

0.09

Conductivity

192.4 ± 24.8

294.9 ± 3.7

505.7 ± 9.6

0.000

608.8 ± 28.4

705.8 ± 24.2

1188.3 ± 44.8

0.005

Turbidity

127 ± 38.1

73.4 ± 4.2

146 ± 7.7

0.000

93.98 ± 5

78.2 ± 3.9

148.2 ± 8.4

0.05

pH

5.89 ± 0.2

6.61 ± 0.02

6.77 ± 0.12

0.12

6.46 ± 0.05

7.04 ± 0.04

6.96 ± 0.05

0.07

Temperature

29.9 ± 0.4

29.6 ± 0.06

30.2 ± 0.1

0.60

28.69 ± 0.18

27.93 ± 0.1

27.7 ± 0.13

0.30

Ammonia

1.03 ± 0.4

1.02 ± 0.05

1.03 ± 0.07

0.06

1.84 ± 0.1

1.83 ± 0.09

2.4 ± 0.1

0.4

Nitrates

4.8 ± 1.2

4.01 ± 0.2

7.42 ± 0.5

0.29

2.7 ± 0.09

3,53 ± 0.18

4.02 ± 0.21

0.28

Nitrites

0.05 ± 0.01

0.5 ± 0.05

0.07 ± 0.007

0.68

0.26 ± 0.02

0.22 ± 0.01

0.37 ± 0.03

0.49

Aluminium

0.96 ± 0.3

0.124 ± 0.01

1.4 ± 0.14

0.08

0.01 ± 0.0006

0.045 ± 0.003

0.032 ± 0.004

0.03

Manganese

73.5 ± 27

6.8 ± 1.6

55.2 ± 4.8

0.19

0.012 ± 0.0007

0.013 ± 0.0005

0.007 ± 0.0004

0.14

Phosphate

0.99 ± 0.3

0.67 ± 0.05

0.69 ± 0.14

0.025

1.12 ± 0.04

0.60 ± 0.075

1.1 ± 0.05

0.03

Sulfate

27.7 ± 5.7

24.8 ± 1.03

36.8 ± 2

0.67

16.3 ± 1

45.78 ± 1.4

38.4 ± 2.2

0.001

Mg Hardness

10.2 ± 2.6

24.3 ± 1.6

9.4 ± 1.03

0.06

16 ± 1.9

24.07 ± 3.4

21.9 ± 3

0.46

Total hardness

20 ± 4.5

57.4 ± 1.9

60.6 ± 3.4

0.37

94 ± 3.5

116.7 ± 3.6

125.6 ± 3.8

0.06

Magnesium

1.67 ± 1.9

3.04 ± 0.56

0.6 ± 0.3

0.18

22.4 ± 2.4

23.3 ± 1.7

24.7 ± 2

0.97

Iron

-

12.9 ± 1.4

23.2 ± 6.4

0.16

3.2 ± 0.3

5.4 ± 0.4

3.8 ± 0.4

0.11

Potassium

-

8.6 ± 0.69

21.5 ± 3.5

0.03

13.4 ± 2.4

7.8 ± 0.6

18.3 ± 2.2

0.05

Dissolve oxygen

-

89.9 ± 6.5

360.9 ± 309

0.31

122.9 ± 9.2

85.8 ± 2.8

84.3 ± 0.9

0.17

  1. Significant if P < 0.05