Mountaintop mining pollution has distinct chemical signatures

Aug 15, 2013

Three elements commonly found at elevated levels in an Appalachian river polluted by runoff from mountaintop coal mining have distinctive chemistries that can be traced back to their source, according to a Duke University-led study.

The distinctive chemistries of sulfur, carbon and strontium provide scientists with new, more accurate ways to track pollution from mountaintop mining sites and to distinguish it from contamination from other sources.

"Essentially, we found that these elements have unique isotopic fingerprints, meaning we can use them as to quantify mountaintop mining's relative contribution to contamination in a watershed," said Avner Vengosh, professor of and water quality at Duke's Nicholas School of the Environment.

The newly identified tracers will be especially useful in with more than one source of potential contamination, he said. "Because they allow us to distinguish if contaminants are coming from , fracking and development, , disposal, or other causes."

Vengosh and his team's findings were published today in the online edition of the peer-reviewed journal Environmental Science & Technology.

The researchers measured the chemical and isotopic compositions of water samples collected monthly from 23 locations along West Virginia's Upper Mud River and its tributaries between May and December 2012.

They found that the isotopic signatures of sulfur (in sulfate), carbon (in dissolved inorganic carbon) and strontium from water samples collected from tributaries adjacent to mountaintop mining sites are distinguishable from those collected from unaffected upstream waters. They also found that the strontium isotope ratio is a sensitive tracer for selenium contamination, one of the major pollutants of mountaintop mining.

In , companies use explosives and heavy machinery to clear away surface rocks and extract shallow deposits of high-quality coal. The companies typically dispose of the waste rock in adjacent valleys, where they bury existing headwater streams.

Previous studies by the Duke team and others have shown that runoff from these "valley fills" contains elevated levels of salts and selenium, a known fish toxin. The contamination can persist and accumulate in downstream waters for decades after active mining stops and the fills are reclaimed.

By conducting tests that simulated the natural leaching of contaminants from local rocks, Vengosh and his team were able to characterize the chemistry of the different geological formations that end up as waste rock in these fills. They found significant differences in strontium isotope ratios and selenium concentrations in streams flowing from reclaimed valley fills versus those flowing from active fills.

"This helps us further pinpoint the source of contamination by linking it directly to the type of rocks in the valley fills," Vengosh said.

The Upper Mud River flows through sparsely populated areas of southern West Virginia as a headwater stream. For about 10 kilometers, the river passes through the Hobet 21 surface mining complex, which has been active since the 1970s and is among the largest in the Appalachian coalfields.

Explore further: Australia out of step with new climate momentum

More information: "The Isotopic Imprints of Mountaintop Mining Contaminants," Avner Vengosh, T. Ty Lindberg, Brittany R. Merola, Laura Ruhl, Nathaniel R. Warner, Alissa White, Gary S. Dwyer and Richard T. Di Giulio. Environmental Science & Technology, August 15, 2013 DOI: 10.1021/es4012959

add to favorites email to friend print save as pdf

Related Stories

New study documents cumulative impact of mountaintop mining

Dec 12, 2011

Increased salinity and concentrations of trace elements in one West Virginia watershed have been tied directly to multiple surface coal mines upstream by a detailed new survey of stream chemistry. The Duke University team ...

Recommended for you

Australia out of step with new climate momentum

1 hour ago

Australian Prime Minister Tony Abbott, who rose to power in large part by opposing a tax on greenhouse gas emissions, is finding his country isolated like never before on climate change as the U.S., China ...

Education is key to climate adaptation

16 hours ago

Given that some climate change is already unavoidable—as just confirmed by the new IPCC report—investing in empowerment through universal education should be an essential element in climate change adaptation ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.