Arsenic is a toxin now widely present in rivers and groundwater in countries such as Bangladesh and Vietnam. It is released by the activity of microorganisms. Yet for a long time it was unclear what the microorganisms ate to release the arsenic. A team of geomicrobiologists led by Professor Andreas Kappler from the University of Tübingen has shown that the microbes break down arsenic-bearing sediments using organic compounds from deep layers as food, disproving theories that the fuel for their activity was drawn from plants or algae on the surface. Now the team has also shown that along with the organic materials in the sediments, methane gas is an important source of food for the bacteria and also plays a key role in their release of arsenic. This new mechanism responsible for arsenic mobilization can explain elevated concentration of arsenic in many aquifers and will help to more precisely predict future drinking water contamination. The study has been published in the journal Nature Communications Earth & Environment.
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Source: Phys.org