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

Environmental Toxicology and Chemistry
By: , and 

Links

Abstract

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.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Influence of a chlor-alkali superfund site on mercury bioaccumulation in periphyton and low-trophic level fauna
Series title Environmental Toxicology and Chemistry
DOI 10.1002/etc.2964
Volume 34
Issue 7
Year Published 2015
Language English
Publisher Wiley
Contributing office(s) National Research Program - Western Branch, Toxic Substances Hydrology Program
Description 10 p.
First page 1649
Last page 1658
Country United States
State New Hampshire
Other Geospatial Androscoggin River
Online Only (Y/N) N
Additional Online Files (Y/N) N