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Table 2 Assignment of weights in the ground water WQI

From: Assessment of the quality of groundwater for drinking purposes in the Upper West and Northern regions of Ghana

Parameter Weight (wi) Relative weight (Wi) WHO standards
pH 3 0.05 8.5
Conductivity 3 0.05 1400
Total dissolved solutes 5 0.09 1000
Temperature 1 0.02 25
True colour/appearance 1 0.02 15
Turbidity 1 0.02 5
Total Hardness 3 0.05 500
Calcium ions 3 0.05 75
Magnesium ions 3 0.05 50
Chloride ions 5 0.09 250
Nitrate-nitrogen 5 0.09 10
Nitrite-nitrogen 4 0.07 3
Total iron 1 0.02 0.3
Ammonium ions 5 0.09 1.5
Fluoride 5 0.09 1.5
Aluminium 5 0.09 0.2
Arsenic 5 0.09 0.01
  ∑wi = 58 ∑Wi = 1.00  
  1. WHO World Health Organization