The Importance of Land Use Definition in Human Health Risk Assessment Related to Lead in Soils

Table 1

Parameters and values used in human health risk assessment.

Parameter	Name	Units	Value
Cexp	Concentration of the trace element	ppm	Element dependent
Ring	Ingestion rate	mg/day	200, children
			100, adults
EF	Exposure frequency	days/year	40, recreational
ED	Exposure duration	years	6, children
			24, adults
BW	Body weight	kg	15, children
			70, adults
AT	Averaging time	days	ED × 365
Rinh	Inhalation rate	m^3/day	7.5, children
			20, adults
PEF	Particle emission factor	m^3/kg	1.36 × 10^9
SA	Exposed skin area	cm^2/day	2800, children
			5700, adults
SAF	Skin adherence factor	mg/cm^2	0.2, children
			0.07, adults
ABS	Dermal absorption factor	—	0.001, noncarcinogenic
			0.01, carcinogenic