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Issue 4, 2016
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Partitioning of naturally-occurring radionuclides (NORM) in Marcellus Shale produced fluids influenced by chemical matrix

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Abstract

Naturally-occurring radioactive materials (NORM) associated with unconventional drilling produced fluids from the Marcellus Shale have raised environmental concerns. However, few investigations into the fundamental chemistry of NORM in Marcellus Shale produced fluids have been performed. Thus, we performed radiochemical experiments with Marcellus Shale produced fluids to understand the partitioning behavior of major radioelements of environmental health concern (uranium (U), thorium (Th), radium (Ra), lead (Pb), and polonium (Po)). We applied a novel radiotracer, 203Pb, to understand the behavior of trace-levels of 210Pb in these fluids. Ultrafiltration experiments indicated U, Th, and Po are particle reactive in Marcellus Shale produced fluids and Ra and Pb are soluble. Sediment partitioning experiments revealed that >99% of Ra does not adsorb to sediments in the presence of Marcellus Shale produced fluids. Further experiments indicated that although Ra adsorption is related to ionic strength, the concentrations of heavier alkaline earth metals (Ba, Sr) are stronger predictors of Ra solubility.

Graphical abstract: Partitioning of naturally-occurring radionuclides (NORM) in Marcellus Shale produced fluids influenced by chemical matrix

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Publication details

The article was received on 17 Oct 2015, accepted on 01 Mar 2016 and first published on 01 Mar 2016


Article type: Paper
DOI: 10.1039/C5EM00540J
Citation: Environ. Sci.: Processes Impacts, 2016,18, 456-463
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    Partitioning of naturally-occurring radionuclides (NORM) in Marcellus Shale produced fluids influenced by chemical matrix

    A. W. Nelson, A. J. Johns, E. S. Eitrheim, A. W. Knight, M. Basile, E. A. Bettis III, Michael. K. Schultz and T. Z. Forbes, Environ. Sci.: Processes Impacts, 2016, 18, 456
    DOI: 10.1039/C5EM00540J

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