Document Detail


Relationship between the loading rate of inorganic mercury to aquatic ecosystems and dissolved gaseous mercury production and evasion.
MedLine Citation:
PMID:  16860838     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of our study was to test the hypothesis that dissolved gaseous mercury (DGM) production and evasion is directly proportional to the loading rate of inorganic mercury [Hg(II)] to aquatic ecosystems. We simulated different rates of atmospheric mercury deposition in 10-m diameter mesocosms in a boreal lake by adding multiple additions of Hg(II) enriched with a stable mercury isotope ((202)Hg). We measured DGM concentrations in surface waters and estimated evasion rates using the thin-film gas exchange model and mass transfer coefficients derived from sulfur hexafluoride (SF(6)) additions. The additions of Hg(II) stimulated DGM production, indicating that newly added Hg(II) was highly reactive. Concentrations of DGM derived from the experimental Hg(II) additions ("spike DGM") were directly proportional to the rate of Hg(II) loading to the mesocosms. Spike DGM concentrations averaged 0.15, 0.48 and 0.94 ng l(-1) in mesocosms loaded at 7.1, 14.2, and 35.5 microg Hg m(-2) yr(-1), respectively. The evasion rates of spike DGM from these mesocosms averaged 4.2, 17.2, and 22.3 ng m(-2)h(-1), respectively. The percentage of Hg(II) added to the mesocosms that was lost to the atmosphere was substantial (33-59% over 8 weeks) and was unrelated to the rate of Hg(II) loading. We conclude that changes in atmospheric mercury deposition to aquatic ecosystems will not change the relative proportion of mercury recycled to the atmosphere.
Authors:
Alexandre J Poulain; Diane M Orihel; Marc Amyot; Michael J Paterson; Holger Hintelmann; George R Southworth
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-07-24
Journal Detail:
Title:  Chemosphere     Volume:  65     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-11-22     Completed Date:  2007-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  2199-207     Citation Subset:  IM    
Affiliation:
Département de Sciences Biologiques, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Pavillon Marie-Victorin, Montréal, QC, Canada H3C 3J7. alexandre.poulain@umontreal.ca
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MeSH Terms
Descriptor/Qualifier:
Ecosystem*
Gases*
Mercury / chemistry*
Water Pollutants, Chemical*
Chemical
Reg. No./Substance:
0/Gases; 0/Water Pollutants, Chemical; 7439-97-6/Mercury

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