Table 6 Accumulation index and pollution grading standards.
From: Characterization and evaluation of Fe2+ and Mn2+ in reservoirs and sediments in the Jianghuai Region
Igeo | < 0 | 0–1 | 1–2 | 2–3 | 3–4 | 4–5 | > 5 |
|---|---|---|---|---|---|---|---|
Pollution level | Ⅰ | Ⅱ | Ⅲ | Ⅳ | Ⅴ | Ⅵ | Ⅶ |
Degree of pollution | None | Light pollution | Light to moderate pollution | moderate pollution | Light to moderate pollution | Severe pollution | Serious pollution |
