Heavy metals are classified as metals with high densities, atomic weights or atomic numbers. Heavy metals such as arsenic, cadmium, mercury, and lead pose as health risks if found in significant levels in health or food products. Cannabis plants can absorb and trans-locate heavy metals from soils (if the soils are contaminated), and can consequently be present in the plant material that needs to be processed. 

Heavy metal limits set by tGO 93

The maximum level of heavy metals in medicinal cannabis must comply with the limits specified in Schedule 1 of the TGO 93 Standard for Medicinal Cannabis.

The limits set by TGO 93 for each respective heavy metal are:

TGO 93 Heavy Metal screen

An analytical screen quantifying the levels of arsenic, cadmium, lead and mercury in a sample.

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