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Environmental Systems Research

Table 2 Descriptive table for ecological risk factor (Er)

From: Environmental pollution loads on surface water chemistry and potentially ecological risks of inland aquatic ecosystem in South-Eastern State, Nigeria

Classes

Indications

Eri ≤ 40

low potential ecological risk

40 ≤ Eri < 80

moderate potential ecological risk

80 ≤ Eri < 160

considerable potential ecological risk

160 ≤ Eri < 320

high potential ecological risk

Eri ≥ 320

very high ecological risk

  1. (Hakanson, 1980)
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