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Table 2 Weights and relative weights of physiochemical parameters

From: Hydrochemical characteristics of surface water and ecological risk assessment of sediments from settlements within the Birim River basin in Ghana

Parameters Units WHO standard (2011) Weight (wi) Relative weight
\({W_{i}} = \frac{{{\text{w}}_{\text{i}} }}{{\mathop \sum \nolimits_{{{\text{i}} = 1}}^{\text{n}} {\hbox{w}}_{\text{i}} }}\)
pH   6.5–8.5 4 0.093
TDS mg/L 500 4 0.093
SO42− mg/L 250 4 0.093
Ca mg/L 75 2 0.047
Mg mg/L 50 2 0.047
Total harness mg/L 500 3 0.070
NO3 mg/L 45 5 0.116
Fe mg/L 0.3 3 0.070
Zn mg/L 3.0 3 0.070
Na+ mg/L 200 1 0.023
K+ mg/L 12 1 0.023
Cl mg/L 250 5 0.116
HCO3 mg/L 300 3 0.070
EC μS/cm 500 3 0.070
    \(\sum {\text{w}}_{\text{i}}\) = 43 \(\sum {\text{w}}_{\text{i}}\) = 1