Table 1.

The parameters of exposure assessment

Parameter	Meaning	unit	Value
			noncancer		cancer
			adult	child
ADDi(ingestion)	Average Daily Rose	mg/ kg. day
C	Concentration of trace	mg/L
IR	Ingestion Rate	L/day	2	1	2
EF	Exposure Frequency	days/year	365	365	365
ED	Exposure Duration	years	30	6	70
BW	Body Weight	kg	70	15	70
AT	Average Time	days	ED × 365	ED × 365	70 × 365