The Risk Assessment of Sediment Heavy Metal Pollution in the East Dongting Lake Wetland

Table 4

Heavy metal toxic coefficient and geochemistry background of the Dongting Lake wetlands.

Items	Cd	Cr	Ni	Pb
Toxic coefficient ()	30	2	5	5
Reference dose () (mg kg^−1)	1.74	108.25	46.17	41.32
The single risk indices ()	186.37	2.18	4.89	6.59