Evaluation of Heavy Metal and Microbial Contamination in Green Tea and Herbal Tea Used for Weight Loss in the Palestinian Market

Table 1

Examples of allowable limits of toxic heavy metals according to the World Health Organization (WHO).

Element	For edible plants (mg/kg)	For medicinal plants (mg/kg)
Nickel (Ni)	1.63	1.5
Copper (Cu)	3	10
Zinc (Zn)	27.4	50
Cadmium (Cd)	0.2	0.3
Lead (Pb)	0.43	10
Chromium (Cr)	0.02	1.3