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Metals such as mercury, cadmium, chromium, barium, aluminum are widely dispersed in the environment and contamination of environmental elements such as water, farmland varies widely. Cannabis has been found to easily accumulate metals from contaminated soils. Metals can be removed by acid leaching after cannabis harvesting.

The American Association for Herbal Products (AHPA 2013) proposed the following values ​​for maximum levels of oral ingestion in herbal products:

Arsenic (As): 10.0 µg / day
Cadmium (Cd): 4.1 μg / day
Lead (Pb): 6.0 μg / day
Mercury (as Me-Hg): 2.0 μg / day

We also perform tests of other mainly heavy metals:

Nickel (Ni),
Baryum (Ba),
Strontium (Sr),
Aluminum (Al).

The analytical method consists of acid mineralization and subsequent analysis on ICP-MS.