Assessing mercury mobility in sediment of the Union Canal, Scotland, UK by sequential extraction and thermal desorption

Olga Cavoura, Christine M. Davidson, Helen E. Keenan, Ana T. Reis, Eduarda Pereira

Research output: Contribution to journalArticle

Abstract

The mobility of mercury (Hg) was assessed in sediment from the Union Canal, Scotland, UK. Samples collected from the vicinity of a former munitions factory that manufactured mercury fulminate detonators were subjected to sequential extraction followed by cold vapor atomic absorption spectrometry (CVAAS) and direct analysis using thermal desorption (TD). The sequential extraction indicated that > 75% of mercury (up to 429 mg kg −1 ) was in mobile forms, with < 12% semimobile and < 23% nonmobile species. In the TD method, > 67% of the total Hg content was desorbed in the temperature range 100–250 °C consistent with species weakly attached to the mineral matrix [tentatively identified as an iron (oxy)hydroxide-associated species]. This predominance of mobile mercury species may arise from a lack of association between Hg and either organic matter or sulfur in the sediments. Further investigation of Hg mobilization, transport, and assimilation/biomagnification is required both to determine whether there is a need for remediation of the sediment and to improve understanding of the biogeochemical cycling of Hg in shallow, oxic, freshwater systems.

LanguageEnglish
Pages650-656
Number of pages7
JournalArchives of Environmental Contamination and Toxicology
Volume76
Issue number4
Early online date19 Mar 2019
DOIs
Publication statusPublished - 31 May 2019

Fingerprint

Thermal desorption
Canals
Mercury
Sediments
Atomic absorption spectrometry
Remediation
Sulfur
Biological materials
Minerals
Industrial plants
Iron
Vapors
Temperature

Keywords

  • mercury
  • thermal desorption
  • sequential extraction
  • sediment

Cite this

@article{c99d0c20effd41bb951a360e7abcb268,
title = "Assessing mercury mobility in sediment of the Union Canal, Scotland, UK by sequential extraction and thermal desorption",
abstract = "The mobility of mercury (Hg) was assessed in sediment from the Union Canal, Scotland, UK. Samples collected from the vicinity of a former munitions factory that manufactured mercury fulminate detonators were subjected to sequential extraction followed by cold vapor atomic absorption spectrometry (CVAAS) and direct analysis using thermal desorption (TD). The sequential extraction indicated that > 75{\%} of mercury (up to 429 mg kg −1 ) was in mobile forms, with < 12{\%} semimobile and < 23{\%} nonmobile species. In the TD method, > 67{\%} of the total Hg content was desorbed in the temperature range 100–250 °C consistent with species weakly attached to the mineral matrix [tentatively identified as an iron (oxy)hydroxide-associated species]. This predominance of mobile mercury species may arise from a lack of association between Hg and either organic matter or sulfur in the sediments. Further investigation of Hg mobilization, transport, and assimilation/biomagnification is required both to determine whether there is a need for remediation of the sediment and to improve understanding of the biogeochemical cycling of Hg in shallow, oxic, freshwater systems.",
keywords = "mercury, thermal desorption, sequential extraction, sediment",
author = "Olga Cavoura and Davidson, {Christine M.} and Keenan, {Helen E.} and Reis, {Ana T.} and Eduarda Pereira",
year = "2019",
month = "5",
day = "31",
doi = "10.1007/s00244-019-00615-y",
language = "English",
volume = "76",
pages = "650--656",
journal = "Archives of Environmental Contamination and Toxicology",
issn = "0090-4341",
publisher = "Springer",
number = "4",

}

Assessing mercury mobility in sediment of the Union Canal, Scotland, UK by sequential extraction and thermal desorption. / Cavoura, Olga; Davidson, Christine M.; Keenan, Helen E.; Reis, Ana T.; Pereira, Eduarda.

In: Archives of Environmental Contamination and Toxicology, Vol. 76, No. 4, 31.05.2019, p. 650-656.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessing mercury mobility in sediment of the Union Canal, Scotland, UK by sequential extraction and thermal desorption

AU - Cavoura, Olga

AU - Davidson, Christine M.

AU - Keenan, Helen E.

AU - Reis, Ana T.

AU - Pereira, Eduarda

PY - 2019/5/31

Y1 - 2019/5/31

N2 - The mobility of mercury (Hg) was assessed in sediment from the Union Canal, Scotland, UK. Samples collected from the vicinity of a former munitions factory that manufactured mercury fulminate detonators were subjected to sequential extraction followed by cold vapor atomic absorption spectrometry (CVAAS) and direct analysis using thermal desorption (TD). The sequential extraction indicated that > 75% of mercury (up to 429 mg kg −1 ) was in mobile forms, with < 12% semimobile and < 23% nonmobile species. In the TD method, > 67% of the total Hg content was desorbed in the temperature range 100–250 °C consistent with species weakly attached to the mineral matrix [tentatively identified as an iron (oxy)hydroxide-associated species]. This predominance of mobile mercury species may arise from a lack of association between Hg and either organic matter or sulfur in the sediments. Further investigation of Hg mobilization, transport, and assimilation/biomagnification is required both to determine whether there is a need for remediation of the sediment and to improve understanding of the biogeochemical cycling of Hg in shallow, oxic, freshwater systems.

AB - The mobility of mercury (Hg) was assessed in sediment from the Union Canal, Scotland, UK. Samples collected from the vicinity of a former munitions factory that manufactured mercury fulminate detonators were subjected to sequential extraction followed by cold vapor atomic absorption spectrometry (CVAAS) and direct analysis using thermal desorption (TD). The sequential extraction indicated that > 75% of mercury (up to 429 mg kg −1 ) was in mobile forms, with < 12% semimobile and < 23% nonmobile species. In the TD method, > 67% of the total Hg content was desorbed in the temperature range 100–250 °C consistent with species weakly attached to the mineral matrix [tentatively identified as an iron (oxy)hydroxide-associated species]. This predominance of mobile mercury species may arise from a lack of association between Hg and either organic matter or sulfur in the sediments. Further investigation of Hg mobilization, transport, and assimilation/biomagnification is required both to determine whether there is a need for remediation of the sediment and to improve understanding of the biogeochemical cycling of Hg in shallow, oxic, freshwater systems.

KW - mercury

KW - thermal desorption

KW - sequential extraction

KW - sediment

UR - http://www.scopus.com/inward/record.url?scp=85063209126&partnerID=8YFLogxK

UR - https://link.springer.com/journal/244

U2 - 10.1007/s00244-019-00615-y

DO - 10.1007/s00244-019-00615-y

M3 - Article

VL - 76

SP - 650

EP - 656

JO - Archives of Environmental Contamination and Toxicology

T2 - Archives of Environmental Contamination and Toxicology

JF - Archives of Environmental Contamination and Toxicology

SN - 0090-4341

IS - 4

ER -