Abstract
Mountaintop removal mining (MTM) is a widely used approach to surface coal mining in the US Appalachian region whereby large volumes of coal overburden are excavated using explosives, removed, and transferred to nearby drainages below MTM operations. To investigate the air quality impact of MTM, the geochemical characteristics of atmospheric particulate matter (PM) from five surface mining sites in south central West Virginia, USA, and five in-state study control sites having only underground coal mining or no coal mining whatsoever were determined and compared. Epidemiologic studies show increased rates of cancer, respiratory disease, cardiovascular disease, and overall mortality in Appalachian surface mining areas compared to Appalachian non-mining areas. In the present study, 24-h coarse (>2.5 µm) and fine (≤2.5 µm) PM samples were collected from two surface mining sites in June 2011 showed pronounced enrichment in elements having a crustal affinity (Ga, Al, Ge, Rb, La, Ce) contributed by local sources, relative to controls. Follow-up sampling in August 2011 lacked this enrichment, suggesting that PM input from local sources is intermittent. Using passive samplers, dry deposition total PM elemental fluxes calculated for three surface mining sites over multi-day intervals between May and August 2012 were 5.8 ± 1.5 times higher for crustal elements than at controls. Scanning microscopy of 2,249 particles showed that primary aluminosilicate PM was prevalent at surface mining sites compared to secondary PM at controls. Additional testing is needed to establish any link between input of lithogenic PM and disease rates in the study area.
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Acknowledgments
We acknowledge the support of the USGS Energy Resources Program for participation in the study by USGS authors. For use of SEM-EDX facilities, we acknowledge the WVU Shared Research Facilities. We thank Ruth Wolf, analyst, for trace element data obtained at the USGS Central Mineral and Environmental Resources Science Center Laboratories, Denver, CO. Initial reviews by Madalyn Blondes and James L. Coleman, USGS, helped improve the manuscript as did subsequent reviews by Journal reviewers. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government.
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Kurth, L., Kolker, A., Engle, M. et al. Atmospheric particulate matter in proximity to mountaintop coal mines: sources and potential environmental and human health impacts. Environ Geochem Health 37, 529–544 (2015). https://doi.org/10.1007/s10653-014-9669-5
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DOI: https://doi.org/10.1007/s10653-014-9669-5