Risk assessment of potentially toxic metals in soil and fertiliser products - fate and effects in the food chain and the environment

Ordered: 30.10.2017

Report no:

Publishing: 06.12.2021

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Key message:

The Norwegian Scientific Committee for Food and Environment (VKM) will conduct a risk assessment of potentially toxic metals in soil and fertiliser products and look at the fate and effects of these metals in the food chain and the environment.

The potentially toxic metals arsenic, cadmium, chromium, copper, lead, mercury, nickel and zinc are present as natural elements in soil. They can also be present as contaminants in fertilising materials. With repeated fertiliser applications over time, these metals may accumulate in soil, resulting in negative health and environmental effects.

Levels of toxic metals in agricultural soil

The Norwegian Food Safety Authority has requested the VKM to give their opinion on several questions related to the potentially toxic metals arsenic (As), cadmium (Cd), Chromium III (Cr3+), Chromium VI (Cr6+), copper (Cu), lead (Pb), mercury (Hg), nickel (Ni) and zinc (Zn) in Norwegian agricultural soil.

What do we know about the levels of these metals in agricultural soil in Norway today?
Describe the fate (mobility) of these elements within and umiddelbart rundt outside of agricultural soil after the application of fertiliser products containing these elements to agricultural land and transfer to the affected organisms in table 1?
What level of these metals in agricultural soils would give the risk of negative effects* on the selected affected organisms found in table 1?
What do we know about the current exposure to these metals for the affected exposure levels and the sources for the exposure?

‌**Table 1: Affected organisms**
Affected organism	*Negative effects
Plants Agricultural plants for food and feed Farmed/Cultivated mushrooms	Reduced germination/growth and crop Reduced germination/growth and crop
Animals Soil organisms Aquatic organisms Domestic animals for food production, eating forage like grass and/or other feed from fields where mineral fertilisers has been used	Ecotoxicology (environmental risk) Ecotoxicology (environmental risk) Reduced animal health
Humans Whole population and subgroups*	Exposure/intake, not toxicological effects*