Arsenic enters the environment and thus the food chain from volcanic eruptions, combustion of fossil fuels and also through groundwater. But actually how big is the risk from arsenic in food? Are arsenic-containing compounds absorbed by the human body and possibly converted into more toxic forms? So far, very little is known about this.

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http://www.bam.de/en/aktuell/presse/pressemitteilungen/pm_2013/pm13_2013.htm

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http://www.sciencedirect.com/science/article/pii/S0039914013001252