PoplarV1, Main, Exploration, bibRecord, 002484

Sources of mercury in a contaminated stream--implications for the timescale of recovery.

Identifieur interne : 002484 ( Main/Exploration ); précédent : 002483; suivant : 002485

Sources of mercury in a contaminated stream--implications for the timescale of recovery.

Auteurs : George Southworth [États-Unis] ; Teresa Mathews ; Mark Greeley ; Mark Peterson ; Scott Brooks ; Dick Ketelle

Source :

Environmental toxicology and chemistry [ 1552-8618 ] ; 2013.

RBID : pubmed:23297245

Descripteurs français

KwdFr :
- Mercure (analyse), Polluants chimiques de l'eau (analyse), Rivières (composition chimique), Sol (composition chimique), Surveillance de l'environnement (MeSH), Tennessee (MeSH).
MESH :
- analyse : Mercure, Polluants chimiques de l'eau.
- composition chimique : Rivières, Sol.
- Surveillance de l'environnement, Tennessee.

English descriptors

KwdEn :
- Environmental Monitoring (MeSH), Mercury (analysis), Rivers (chemistry), Soil (chemistry), Tennessee (MeSH), Water Pollutants, Chemical (analysis).
MESH :
- chemical , analysis : Mercury, Water Pollutants, Chemical.
- chemistry : Rivers, Soil.
- Environmental Monitoring, Tennessee.

Abstract

Mercury contamination in East Fork Poplar Creek in Tennessee arises from dissolved mercury exiting a headwater industrial complex and residual mercury in the streambed and soil throughout the watershed downstream. The headwater inputs generate chronic base flow concentrations of total mercury of about 1,000 ng/L, but most of the annual export of mercury from the system appears to originate farther downstream. Effective targeting of remedial efforts requires determining how long downstream sources might continue to contaminate the system following elimination of the headwater mercury inputs. The authors calculations suggest that (1) contaminated soils and sediments account for >80% of the annual mercury export from the entire watershed, with most export occurring during wet weather events; (2) bank erosion and resuspension of streambed particulates are the major mercury sources maintaining high annual mercury export rates; and (3) the inventory of particle-associated mercury in the streambed was not large enough to sustain the estimated export rates for more than a few years. The authors findings imply that to prevent waterborne mercury contamination in this system from continuing for decades, remedial actions will have to control the headwater mercury source that sustains day-to-day base flow mercury concentrations and the riparian stream-bank sources that generate most of the mercury export from the system.

DOI: 10.1002/etc.2115
PubMed: 23297245

Affiliations:

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Le document en format XML

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<term>Surveillance de l'environnement (MeSH)</term>
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<front><div type="abstract" xml:lang="en">Mercury contamination in East Fork Poplar Creek in Tennessee arises from dissolved mercury exiting a headwater industrial complex and residual mercury in the streambed and soil throughout the watershed downstream. The headwater inputs generate chronic base flow concentrations of total mercury of about 1,000 ng/L, but most of the annual export of mercury from the system appears to originate farther downstream. Effective targeting of remedial efforts requires determining how long downstream sources might continue to contaminate the system following elimination of the headwater mercury inputs. The authors calculations suggest that (1) contaminated soils and sediments account for >80% of the annual mercury export from the entire watershed, with most export occurring during wet weather events; (2) bank erosion and resuspension of streambed particulates are the major mercury sources maintaining high annual mercury export rates; and (3) the inventory of particle-associated mercury in the streambed was not large enough to sustain the estimated export rates for more than a few years. The authors findings imply that to prevent waterborne mercury contamination in this system from continuing for decades, remedial actions will have to control the headwater mercury source that sustains day-to-day base flow mercury concentrations and the riparian stream-bank sources that generate most of the mercury export from the system.</div>
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Sources of mercury in a contaminated stream--implications for the timescale of recovery.

Sources of mercury in a contaminated stream--implications for the timescale of recovery.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki