Ar­senic pro­duc­tion mys­tery solved

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Sci­en­tists from Stan­ford Univer­sity have found why ground­wa­ter gets con­tam­i­nated by ar­senic. They stud­ied Cam­bo­dia's per­ma­nent wetlands and found that bac­te­ria there were pri­mar­ily re­spon­si­ble for ar­senic re­lease. The bac­te­ria split ar­senic-bound iron ox­ide com­pounds in the soil for res­pi­ra­tion, re­leas­ing ar­senic in the process, which is trans­ferred to ground­wa­ter.

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