Table 2 Grading of geo-accumulation index.

From: Determination and application of soil heavy metal geochemical baseline in the southern region of Wushan County in the Yangtze River Basin, China

Igeo

< 0

0–1

1–2

2–3

3–4

4–5

> 5

Accumulation degree

No

No-moderate

Moderate

Moderate- strong

Strong

Strong- extremely

Extremely strong

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