Sources Identification and Health Risk Evaluation of 10 Heavy Metals (Metalloids) in Soils of the Aibi Lake Basin, Northwest China

Table 1

Reference doses for the three routes of exposure.

Metals	Reference doses ((mg/(kg.d))
	RfDing	RfDinh	RfDderm
Cu	0.04	0.012	0.04
Hg	0.0003	0.0003	0.000024
Zn	0.3	0.3	0.06
Pb	0.0035	0.00352	0.000525
Cd	0.001	0.001	0.00001
As	0.0003	0.000123	0.0003
Ni	0.02	0.0206	0.0008
Cr	0.003	0.0000286	0.000075
Co	0.02	0.0000571	0.016
Mn	0.46	0.000014	—