Table 4.

The PTWI of toxic elements (As, Cd, Pb and Cr) and their PMTDI.

No.	Elements	PTWI	PMTDI	Reference
1	As	3.0 μg/kg bw per week	0.42 μg/kg bw per day	[25]
2	Cd	7 μg/Kg bw per week	1 μg/kg bw per day	[26]
3	Pb	25 μg/kg bw per week	3.57 μg/kg bw per day	[27]
4	Cr	0.7 mg/kg bw per week	0.1 mg/kg bw per day *	[28]

* Calculated value based on PTWI.