The DOI matches its Crossref record; 15 of the 15 references it cites were found in a registry or an index.
Binding of Mercury(II) to Dissolved Organic Matter: The Role of the Mercury-to-DOM Concentration Ratio
Abstract
The binding of Hg(II) to dissolved organic matter (DOM; hydrophobic acids isolated from the Florida Everglades by XAD-8 resin) was measured at a wide range of Hg-to-DOM concentration ratios using an equilibrium dialysis ligand exchange method. Conditional distribution coefficients (K(DOM)') determined by this method were strongly affected by the Hg/DOM concentration ratio. At Hg/DOM ratios below approximately 1 microg of Hg/mg of DOM, we observed very strong interactions (K(DOM)' = 10(23.2+/-1.0) L kg(-1) at pH = 7.0 and I = 0.1), indicative of mercury-thiol bonds. Hg/DOM ratios above approximately 10 microg of Hg/mg of DOM, as used in most studies that have determined Hg-DOM binding constants, gave much lower K(DOM)' values (10(10.7+/-1.0) L kg(-1) at pH = 4.9-5.6 and I = 0.1), consistent with Hg binding mainly to oxygen functional groups. These results suggest that the binding of Hg to DOM under natural conditions (very low Hg/DOM ratios) is controlled by a small fraction of DOM molecules containing a reactive thiol functional group. Therefore, Hg/DOM distribution coefficients used for modeling the biogeochemical behavior of Hg in natural systems need to be determined at low Hg/DOM ratios.
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Citations
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Self-citationHeavy Metal Sorption at the Muscovite (001)–Fulvic Acid Interface
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Metadata
- Authors
- Haitzer, M., Aiken, G. R., & Ryan, J. N.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-07-17
- Volume
- 36
- Issue
- 16
- Pages
- 3564-3570
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2048681523
- Cited by
- 434
- References
- 15
- FWCI
- 7.12
- Type
- journal article
- Language
- en
- Open access
- closed
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