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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