Table 4 Reference doses (RfD) for non-carcinogenic heavy metals and slope factors (SF) for carcinogenic heavy metals.

IR_ing⁷³

Ingestion rate of soil

mg/day

50

50

100

100

ED⁷⁶

Exposure duration

Years

30

30

6

6

EF⁷⁷

Exposure frequency

days/year

350

350

350

350

CF⁷³

Conversion factor

kg/mg

1 × 10^–6

1 × 10^–6

1 × 10^–6

1 × 10^–6

BW^{69, 70}

Body weight of the exposed individual

Kg

62.8

54.7

17.2

16.5

AT⁷³

Average time

Years

10,500

10,500

2100

2100

SA⁷¹

Exposed skin surface area

Cm²

2120

1910

1090

1060

SAF⁷⁷

Skin adherence factor

mg/cm²

0.07

0.07

0.2

0.2

DAF⁷⁸

Dermal absorption factor

–

0.13

0.13

0.13

0.13

IR_inh⁷²

Inhalation rate of soil

m³/day

13.1

11.3

7.6

7.4

PEF⁷⁸

Particle emission factor

m³/kg

1.4 × 10⁹

1.4 × 10⁹

1.4 × 10⁹

1.4 × 10⁹