2003
DOI: 10.1007/s00254-002-0624-x
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Mercury contamination chronologies from Connecticut wetlands and Long Island Sound sediments

Abstract: Sediment cores were used to investigate the mercury deposition histories of Connecticut and Long Island Sound. Most cores show background (pre-1800s) concentrations (50-100 ppb Hg) below 30-50 cm depth, strong enrichments up to 500 ppb Hg in the core tops with lower Hg concentrations in the surface sediments (200-300 ppb Hg). A sediment core from the Housatonic River has peak levels of 1,500 ppb Hg, indicating the presence of a Hg point source in this watershed. The Hg records were translated into Hg contamina… Show more

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Cited by 55 publications
(57 citation statements)
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“…The results are indeed consistent with observation from studies elsewhere, where it has long been recognised that Hg is more efficiently transferred from water to bottom sediments [17][18][19]. Such rapid transfer is possibly through mechanisms such as sorption on suspended or bed load material, clay and organic material [20].…”
Section: Containing Widespread Contamination In the Basinsupporting
confidence: 90%
“…The results are indeed consistent with observation from studies elsewhere, where it has long been recognised that Hg is more efficiently transferred from water to bottom sediments [17][18][19]. Such rapid transfer is possibly through mechanisms such as sorption on suspended or bed load material, clay and organic material [20].…”
Section: Containing Widespread Contamination In the Basinsupporting
confidence: 90%
“…Trends in mercury concentration were matched to those reported at nearby sites in cores of independently dated salt-marsh sediment (e.g. Varekamp et al, 2003). Peak 137 Cs activity was 185 assigned an age of 1963 CE reflecting the peak in above ground testing of nuclear weapons.…”
mentioning
confidence: 89%
“…This should include many continental shelf regions, where the fraction of MeHg derived from benthic production is presumably even greater than that in LIS . Accordingly, levels of MeHg in higher trophic levels of the coastal zone may be related to its production in underlying sediments, and this production may have been enhanced during the past 200 y by anthropogenic loadings of inorganic Hg to near-shore and continental shelf sediments (Varekamp et al 2002;Balcom et al 2004).…”
Section: Bioaccumulation and Biomagnification Of Mehgmentioning
confidence: 99%