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Table 5 Metal contamination factor (Fi) of the selected trace metals, classification and environmental risk intensity

From: Eco-toxic risk assessment and source distribution of trace metals in surface sediments of the coastal and in four rivers estuary of Sarawak

Trace metal

Co

Cu

Ni

Cr

Zn

Mn

Cd

As

Metal contamination factor

5.0

5.0

5.0

2.0

1.0

1.0

30.0

10.0

 

Risk Index Value

Environmental Risk Categories

1

Ë‚ 150

Low ecological risk

2

 ≥ 150 ˂ 300

Moderate ecological risk

3

 ≥ 300 ˂ 600

Considerable ecological risk

4

 ≥ 600

Very high ecological risk