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Environmental Systems Research

Table 3 Descriptive table for ecological risk index (Ir)

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

Classes

Indications

Ir < 150,

low ecological risk

150 ≤ Ir < 300

moderate ecological risk

300 ≤ Ir < 600

considerable ecological risk

Ir > 600

very high ecological risk

  1. (Hakason, 1980)
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