Table 1.

Values of variables for human health risk assessment.

Parameters	Unit	Definition	Value		References
			Child	Adult
C	mg/kg	heavy metal concentration
ABSd	--	dermal absorption factor	0.03	0.001	[16]
AF	mg/cm2	soil to skin adherence factor	0.2	0.07	[15]
BW	kg	average body weight	16.2	61.8	[17]
ED	year	exposure duration	6	30	[15]
EF	d/year	exposure frequency	350	350	[15]
ET	h/d	exposure time	24	24	[15]
IngR	mg/d	soil ingestion rate for receptor	200	100	[15]
SA	cm2/event	Skin surface area available for exposure	2,800	5,700	[15]
ATnc	d	averaging time for non-carcinogenic	ED × 365		[15]
ATca	d	averaging time for carcinogenic	LT × 365		[15]
DFSadj	mg × year/kg/d	soil dermal contact factor-age-adjusted	362.4		[18]
IR	mg × year/kg/d	Soil ingestion rate-age adjusted	113		[18]
LT	year	lifetime	72		[19]
PEF	m3/kg	Soil-to-air particulate emission factor	1.36 × 109		[15]