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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