Polyparameter linear free energy relationship for wood char–water sorption coefficients of organic sorbates
Plata, Desiree L.
Hemingway, Jordon D.
Gschwend, Philip M.
MetadataShow full item record
KeywordSorption; Wood char; Hydrophobic organic compounds (HOCs); Polyparameter linear free energy relationship (ppLFER); Black carbon (BC)
Black carbons (BCs), including soots, chars, activated carbons, and engineered nanocarbons, have different surface properties, but we do not know to what extent these affect their sorbent properties. To evaluate this for an environmentally ubiquitous form of BC, biomass char, we probed the surface of a well-studied wood char using 14 sorbates exhibiting diverse functional groups and then fit the data with a polyparameter linear free energy relationship (ppLFER) to assess the importance of the various possible sorbate-char surface interactions. Sorption from water to water-wet char evolved with the sorbate's degree of surface saturation and depended on only a few sorbate parameters: log Kd(L/kg) = [(4.03 ± 0.14) + (-0.15 ± 0.04) log ai)] V + [(-0.28 ± 0.04) log ai)] S + (-5.20 ± 0.21) B where ai is the aqueous saturation of the sorbate i, V is McGowan’s characteristic volume, S reflects polarity, and B represents the electron-donation basicity. As generally observed for activated carbon, the sorbate’s size encouraged sorption from water to the char, while its electron donation/proton acceptance discouraged sorption from water. However, the magnitude and saturation dependence differed significantly from what has been seen for activated carbons, presumably reflecting the unique surface chemistries of these two BC materials and suggesting BC-specific sorption coefficients will yield more accurate assessments of contaminant mobility and bioavailability and evaluation of a site's response to remediation.
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Environmental Toxicology and Chemistry 34 (2015): 1464-1471, doi:10.1002/etc.2951.
Showing items related by title, author, creator and subject.
Estimation of biological parameters of marine organisms using linear and nonlinear acoustic scattering model-based inversion methods Chu, Dezhang; Lawson, Gareth L.; Wiebe, Peter H. (Acoustical Society of America, 2016-05-19)The linear inversion commonly used in fisheries and zooplankton acoustics assumes a constant inversion kernel and ignores the uncertainties associated with the shape and behavior of the scattering targets, as well as other ...
Colored dissolved organic matter in shallow estuaries : relationships between carbon sources and light attenuation Oestreich, William K.; Ganju, Neil K.; Pohlman, John W.; Suttles, Steven E. (Copernicus Publications on behalf of the European Geosciences Union, 2016-02-02)Light availability is of primary importance to the ecological function of shallow estuaries. For example, benthic primary production by submerged aquatic vegetation is contingent upon light penetration to the seabed. A ...
Hart, Constance A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-01)Concern about skewed sex ratios and female-female pairings among endangered roseate terns (Sterna dougallii) on Bird Island in Buzzards Bay, Massachusetts prompted studies with common terns from the same site as a surrogate ...