Influence of a chlor-alkali superfund site on mercury bioaccumulation in periphyton and low-trophic level fauna

In Berlin, New Hampshire, USA, the Androscoggin River flows adjacent to a former chlor‐alkali facility that is a US Environmental Protection Agency Superfund site and source of mercury (Hg) to the river. The present study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg...

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Veröffentlicht in:Environmental toxicology and chemistry 2015-07, Vol.34 (7), p.1649-1658
Hauptverfasser: Buckman, Kate L., Marvin-DiPasquale, Mark, Taylor, Vivien F., Chalmers, Ann, Broadley, Hannah J., Agee, Jennifer, Jackson, Brian P., Chen, Celia Y.
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container_issue 7
container_start_page 1649
container_title Environmental toxicology and chemistry
container_volume 34
creator Buckman, Kate L.
Marvin-DiPasquale, Mark
Taylor, Vivien F.
Chalmers, Ann
Broadley, Hannah J.
Agee, Jennifer
Jackson, Brian P.
Chen, Celia Y.
description In Berlin, New Hampshire, USA, the Androscoggin River flows adjacent to a former chlor‐alkali facility that is a US Environmental Protection Agency Superfund site and source of mercury (Hg) to the river. The present study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg) to lower trophic‐level taxa in the river. Surface sediment directly adjacent to the source showed significantly elevated MeHg (10–40× increase, mean ± standard deviation [SD]: 20.1 ± 24.8 ng g–1 dry wt) and total mercury (THg; 10–30× increase, mean ± SD: 2045 ± 2669 ng g–1 dry wt) compared with all other reaches, with sediment THg and MeHg from downstream reaches elevated (3–7× on average) relative to the reference (THg mean ± SD: 33.5 ± 9.33 ng g–1 dry wt; MeHg mean ± SD: 0.52 ± 0.21 ng g–1 dry wt). Water column THg concentrations adjacent to the point source for both particulate (0.23 ng L–1) and dissolved (0.76 ng L–1) fractions were 5‐fold higher than at the reference sites, and 2‐fold to 5‐fold higher than downstream. Methylmercury production potential of periphyton material was highest (2–9 ng g–1 d–1 dry wt) adjacent to the Superfund site; other reaches were close to or below reporting limits (0. 1 ng g–1 d–1 dry wt). Total Hg and MeHg bioaccumulation in fauna was variable across sites and taxa, with no clear spatial patterns downstream of the contamination source. Crayfish, mayflies, and shiners showed a weak positive relationship with porewater MeHg concentration. Environ Toxicol Chem 2015;34:1649–1658. © 2015 SETAC
doi_str_mv 10.1002/etc.2964
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The present study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg) to lower trophic‐level taxa in the river. Surface sediment directly adjacent to the source showed significantly elevated MeHg (10–40× increase, mean ± standard deviation [SD]: 20.1 ± 24.8 ng g–1 dry wt) and total mercury (THg; 10–30× increase, mean ± SD: 2045 ± 2669 ng g–1 dry wt) compared with all other reaches, with sediment THg and MeHg from downstream reaches elevated (3–7× on average) relative to the reference (THg mean ± SD: 33.5 ± 9.33 ng g–1 dry wt; MeHg mean ± SD: 0.52 ± 0.21 ng g–1 dry wt). Water column THg concentrations adjacent to the point source for both particulate (0.23 ng L–1) and dissolved (0.76 ng L–1) fractions were 5‐fold higher than at the reference sites, and 2‐fold to 5‐fold higher than downstream. Methylmercury production potential of periphyton material was highest (2–9 ng g–1 d–1 dry wt) adjacent to the Superfund site; other reaches were close to or below reporting limits (0. 1 ng g–1 d–1 dry wt). Total Hg and MeHg bioaccumulation in fauna was variable across sites and taxa, with no clear spatial patterns downstream of the contamination source. Crayfish, mayflies, and shiners showed a weak positive relationship with porewater MeHg concentration. 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The present study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg) to lower trophic‐level taxa in the river. Surface sediment directly adjacent to the source showed significantly elevated MeHg (10–40× increase, mean ± standard deviation [SD]: 20.1 ± 24.8 ng g–1 dry wt) and total mercury (THg; 10–30× increase, mean ± SD: 2045 ± 2669 ng g–1 dry wt) compared with all other reaches, with sediment THg and MeHg from downstream reaches elevated (3–7× on average) relative to the reference (THg mean ± SD: 33.5 ± 9.33 ng g–1 dry wt; MeHg mean ± SD: 0.52 ± 0.21 ng g–1 dry wt). Water column THg concentrations adjacent to the point source for both particulate (0.23 ng L–1) and dissolved (0.76 ng L–1) fractions were 5‐fold higher than at the reference sites, and 2‐fold to 5‐fold higher than downstream. 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The present study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg) to lower trophic‐level taxa in the river. Surface sediment directly adjacent to the source showed significantly elevated MeHg (10–40× increase, mean ± standard deviation [SD]: 20.1 ± 24.8 ng g–1 dry wt) and total mercury (THg; 10–30× increase, mean ± SD: 2045 ± 2669 ng g–1 dry wt) compared with all other reaches, with sediment THg and MeHg from downstream reaches elevated (3–7× on average) relative to the reference (THg mean ± SD: 33.5 ± 9.33 ng g–1 dry wt; MeHg mean ± SD: 0.52 ± 0.21 ng g–1 dry wt). Water column THg concentrations adjacent to the point source for both particulate (0.23 ng L–1) and dissolved (0.76 ng L–1) fractions were 5‐fold higher than at the reference sites, and 2‐fold to 5‐fold higher than downstream. 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subjects Animals
Aquatic life
Astacoidea - chemistry
Astacoidea - metabolism
Bioaccumulation
Cambaridae
Contaminated sediments
Contamination
crayfish
Drying
Elevated
Environmental Monitoring
Environmental protection
Ephemeroptera
Fauna
Fishes - metabolism
Geologic Sediments - chemistry
Industry
Insecta - chemistry
Insecta - metabolism
Low-trophic level
Mayflies
Mercury
Mercury (metal)
Mercury - analysis
Mercury - metabolism
Methylmercury
methylmercury compounds
Methylmercury Compounds - analysis
Methylmercury Compounds - metabolism
New Hampshire
Periphyton
Pollution abatement
Pore water
Remediation
River flow
Rivers
Rivers - chemistry
Sediments
Superfund
Toxicology
Trophic levels
United States Environmental Protection Agency
Water column
Water Pollutants, Chemical - analysis
title Influence of a chlor-alkali superfund site on mercury bioaccumulation in periphyton and low-trophic level fauna
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