I think that it must be not more than drinking water limits

The maximum allowable limits of heavy metals in soils and vegetables have been established by standard regulatory bodies such as World Health Organization (WHO), Food and Agricultural Organization (FAO) and Ewers U, Standard Guidelines in Europe as shown in Table 2 in the picture

Abdulzahra Alhello Thank you

Sheikh Mohammad Famim Ahmed Thank you. Please could you give me the reference to the info on that image.

Here is the referenced article -

Article Comparative assessment of heavy metal levels in soil, vegeta...

Àràñbe Tímo you can also see more information in "

Pendias A and Pendias H (2000) Trace elements in soils

and plants. CRC Press, Boca Raton, FL"

It is an intersting paper with new results.