Table 3 Water quality standards for both surface water and fisheries by Ministry of Environmental Protection, People’s Republic of China (MEP 1990, 2002)
From: Heavy metal gradients from rural to urban lakes in central China
Standards | Classification (≤) | Cu (μg/L) | Zn (μg/L) | As (μg/L) | Cd (μg/L) | Cr (μg/L) | Pb (μg/L) | Cd (μg/L) | Ni (μg/L) |
|---|---|---|---|---|---|---|---|---|---|
Surface water quality | I | 10 | 50 | 50 | 1 | 10 | 10 | -- | -- |
II | 1000 | 1000 | 50 | 5 | 50 | 10 | -- | -- | |
III | 1000 | 1000 | 50 | 5 | 50 | 50 | -- | -- | |
IV | 1000 | 2000 | 100 | 5 | 50 | 50 | -- | -- | |
V | 1000 | 2000 | 100 | 10 | 100 | 100 | -- | -- | |
Fishery water quality | Limit value | 100 | 10 | 50 | 0.5 | 50 | 5 | 0.5 | 100 |