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Table 2 Heavy metal pollution index (HPI) and metal index (MI) in freshwater of Rosetta branch

From: Toxicity assessment of heavy metals and organochlorine pesticides in freshwater and marine environments, Rosetta area, Egypt using multiple approaches

Metal Vi Si [26] Wi Qi Wi × Qi MI
Cr 7.29 50 0.02 14.58 0.29 0.15
Ni 24.46 20 0.05 122.3 6.12 1.22
Co 10.23 10 0.1 102.3 10.23 1.02
   ∑ Wi = 0.17 ∑ Wi × Qi = 16.64
    HPI = 98   MI = 2.4
  1. Where Vi: the value of the metal, Si: standard value, Wi; Weightage value and Qi: quality rating