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Fulvic acid-sulfide ion competition for mercury ion binding in the Florida everglades

Water, Air, and Soil Pollution

By:
and
DOI: 10.1023/A:1012073503678

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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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Fulvic acid-sulfide ion competition for mercury ion binding in the Florida everglades
Series title:
Water, Air, and Soil Pollution
DOI:
10.1023/A:1012073503678
Volume
132
Issue:
1-2
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water, Air, and Soil Pollution
First page:
89
Last page:
104
Number of Pages:
16