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Table 5 Description of metal indices being used in this study

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

Index Value Category
CF < 1 Low contamination
1 ≤ CF < 3 Moderate contamination
3 ≤ CF < 6 Considerable degree of contamination
CF ≥ 6 Very high contamination
PLI < 1 No Pollution
> 1 Polluted
Er < 40 Low potential ecological risk
40 ≤ Er < 80 Moderate potential ecological risk
80 ≤ Er < 160 Considerable potential ecological risk
160 ≤ Er < 320 High potential ecological risk
Er ≥ 320 Very high ecological risk
RI < 150 Low ecological risk
150 ≤ RI < 300 Moderate ecological risk
300 ≤ RI < 600 Considerable ecological risk
RI > 600 Very high ecological risk
MI < 0.3 Very Pure
0.3 ≤ MI < 1 Pure
1 ≤ Er < 2 Slightly Affected
2 ≤ Er < 4 Moderately Affected
4 ≤ Er < 6 Strongly Affected
> 6 Seriously Affected
  1. Where CF Contamination Factor, PLI Pollution Load Index, Er Ecological Risk, MI Metal Index and RI Risk Index