ELEMENTS (mg/kg/day)

REFERENCE VALUES

Pb

Zn

REFERENCE

Toxic reference factor

5

1

[25]

Geochemical background value (Bn)

20

95

[26]

Background value of element

85

140

[26]

Oral reference doses (RfD) mg/kg/day

0.3

0.004

[27] [28]

Cancer slope factor

0.0085

-

[29]