| Extreme spatial variability and unprecedented methylmercury concentrations within a constructed wetland. | |
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MedLine Citation:
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PMID: 16404537 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We began monitoring concentrations of both total mercury (THg) and methylmercury (MeHg) in surface water at Stormwater Treatment Area-2 (STA) on July 20, 2000. This 2602 hectare STA was constructed with three independent marshes to remove phosphorus from agricultural runoff and reduce eutrophication in the northern Everglades. However, there was concern that in doing so, STA-2 might inadvertently worsen the existing mercury problem in the Everglades. Accordingly, operating permits stipulated that flow-through operation of these treatment cells could not begin until concentrations of THg and MeHg in the interior marsh were not significantly greater than corresponding concentrations in the supply canal. Cells 2 and 3 quickly met the start-up criteria in the fall of 2000. In contrast, Cell 1 exhibited anomalously high MeHg concentrations in the fall of 2000 and 2001, and the summer of 2002. During the last such event, water-column concentrations in Cell 1 reached 32 ng THg/L and an unprecedented 20 ng MeHg/L. Tissue Hg in resident fishes reached levels as high as 430 ng/g in mosquitofish, Gambusia holbrooki, 930 ng/g in sunfish, Lepomis spp., and 2000 ng/g in largemouth bass, Micropterus salmoides. Guided by results from the monitoring program, flow rate and water depth were managed as a means to alter sulfur biogeochemistry and, thereby, reduce in situ mercury methylation. This adaptive management strategy likely played a role in the decline in water-column concentrations of THg and MeHg in Cell 1 by late 2002 and the subsequent declines in tissue Hg levels in resident fishes. Cell 1 finally met formal start-up criteria on November 26, 2002. |
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Authors:
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D G Rumbold; L E Fink |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental monitoring and assessment Volume: 112 ISSN: 0167-6369 ISO Abbreviation: Environ Monit Assess Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2006-01-11 Completed Date: 2006-09-07 Revised Date: 2009-05-11 |
Medline Journal Info:
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Nlm Unique ID: 8508350 Medline TA: Environ Monit Assess Country: Netherlands |
Other Details:
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Languages: eng Pagination: 115-35 Citation Subset: IM |
Affiliation:
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South Florida Water Management District, West Palm Beach, Florida, USA. drumbol@sfwmd.gov |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Environmental Monitoring / methods* Fishes / metabolism* Mercury / analysis*, metabolism Methylmercury Compounds / analysis*, metabolism Perciformes / metabolism Phosphorus / chemistry Water Pollutants, Chemical / analysis*, metabolism Water Supply |
| Chemical | |
Reg. No./Substance:
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0/Methylmercury Compounds; 0/Water Pollutants, Chemical; 7439-97-6/Mercury; 7723-14-0/Phosphorus |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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