| Abstract: | Negatively charged functional groups of fulvic acid compete with inorganic sulfide ion for mercury ion binding. This competition is evaluated here by using a discrete site-electrostatic model to calculate mercury solution speciation in the presence of fulvic acid. Model calculated species distributions are used to estimate a mercury-fulvic acid apparent binding constant to quantify fulvic acid and sulfide ion competition for dissolved inorganic mercury (Hg(II)) ion binding. Speciation calculations done with PHREEQC, modified to use the estimated mercury-fulvic acid apparent binding constant, suggest that mercury-fulvic acid and mercury-sulfide complex concentrations are equivalent for very low sulfide ion concentrations (about 10-11 M) in Everglades‘ surface water. Where measurable total sulfide concentration (about 10-7 M or greater) is present in Everglades‘ surface water, mercury-sulfide complexes should dominate dissolved inorganic mercury solution speciation. In the absence of sulfide ion (for example, in oxygenated Everglades‘ surface water), fulvic acid binding should dominate Everglades‘ dissolved inorganic mercury speciation. |
| Genre: | Article |
| ProdID: | 70023050 |
| Citation Author: | Reddy, M. M.; Aiken, G. R. |
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| Citation End Page: | 104 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Water, Air, and Soil Pollution |
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| Citation Number Of Pages: | 16 |
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| Citation Search Results Text: | Fulvic acid-sulfide ion competition for mercury ion binding in the Florida everglades; 2001; Article; Journal; Water, Air, and Soil Pollution; Reddy, M. M.; Aiken, G. R. |
| Citation Start Page: | 89 |
| Citation Volume: | 132 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Fulvic acid-sulfide ion competition for mercury ion binding in the Florida everglades; 2001; Article; Journal; Water, Air, and Soil Pollution; Reddy, M. M.; Aiken, G. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1023/A:1012073503678 |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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