Table 2.

Reference dose (RfD) and cancer slope factor (CSF) for different metals.

Element	Rdforal	Rdfdermal	CSF (kg/day/mg)
Pb	1.4	0.42	8.5
Cr	3	0.015	41
Cd	0.5	0.005	6.1
Mo	5	1.9
Zn	300	60
Cu	40	12
Ba	70	14
Ni	20	5.4	0.84