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Table 4 Water quality classification using Metal Index (MI).

From: Evaluation of surface water quality indices and ecological risk assessment for heavy metals in scrap yard neighbourhood

MI

Characteristics

Class

<0.3

Very pure

I

0.3–1.0

Pure

II

1.0–2.0

Slightly affected

III

2.0–4.0

Moderately affected

IV

4.0–6.0

Strongly affected

V

>6.0

Seriously affected

VI

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