Do ecologically grown vegetables take up more contaminants than those that are conventionally grown? According to professor Brit Salbu, it could be a potential problem. She refers to a report that was produced by researchers from NMBU and Nibio in 2013. The researchers found increased levels of trace metals, arsenic and radionuclides in some ecological vegetables produced in the areas with alum shale.
Alum shale is a sedimentary rock with high content of uranium, which is common in the bedrock in Scandinavia. Due to this rock, many areas in Norway have high levels of natural radionuclides; some of those areas are used for agriculture. This could potentially result in uptake of radionuclides and heavy metals by the vegetables produced there. The transfer of contaminants will vary for the different earth types, plant species and farming methods. Therefore, it is important to learn more about these transfer conditions.