| http://www.w3.org/ns/prov#value | - collected samples from 512 private wells across the delta and analyzed them for arsenic, manganese and other toxins such as selenium and barium.Sixty-five percent of the groundwater wells in the Red River delta contain naturally occurring toxic elements, at levels which exceed the World Health Organization's (WHO) safety standards, Berg wrote.The most health threatening ... are arsenic, where 2
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