Fracking plays active role in generating toxic metal wastewater, study finds

http://www.sciencedaily.com/releases/2015/12/151215134653.htm

The production of hazardous wastewater in hydraulic fracturing is assumed to be partly due to chemicals introduced into injected freshwater when it mixes with highly saline brine naturally present in the rock. But a new study investigating the toxic metal barium in fracking wastewater finds that chemical reactions between injected freshwater and the fractured shale itself could play a major role.

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