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Table 2

Reference dose values of heavy metals

Heavy metals	RfD (mg/kg/day)
Zn	0.3^a
Pb	0.0035^a
Cd	0.001^a
Cu	0.04^a
Hg	0.002^b

^aUSEPA (2005); Ghosh et al. (2012); Khan et al. (2013).

^bIPCS (2003).