Bioavailability of metals in contaminated sediments

M. H. Paller, A. S. Knox

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Bioavailability controls the transfer of metals from sediments to ecological receptors and humans. It can rarely be predicted from total metal concentrations because it is affected by metal geochemistry in sediments as well as the biochemistry, physiology, and behavior of benthic organisms. There is no single approach for including bioavailability in risk assessments because of variability in site specific conditions and the difficulty of validating methods. Acid-volatile sulfide and simultaneously extracted metals are useful in predicting bioavailability in anoxic sediments containing sulfides that react to form insoluble metal complexes. This method can be improved by adjusting for organic carbon and other ligands that also bind free metals. Site-specific desorption Kd values calculated by sequential extraction methods can be useful in predicting bioavailable metal fractions in oxic and anoxic sediments. A modified desorption distribution coefficient (Kdg) can be calculated by extraction with the digestive gut fluids of sediment feeding organisms to account for the effects of ingestion on metal release from sediments. Recently developed in situ measurement technologies can accumulate dissolved metals in a controlled fashion that may correspond with bioavailable metal fractions in sediment. Successful evaluation of bioavailability requires the selection of methods suitable for the organisms and sediment environments under consideration. A weight-of-evidence approach that incorporates multiple lines of evidence can help address uncertainties and increase the likelihood of incorporating bioavailability into remedial decisions.

Original languageEnglish (US)
Article number02001
JournalE3S Web of Conferences
Volume1
DOIs
StatePublished - Apr 23 2013
Event16th International Conference on Heavy Metals in the Environment, ICHMET 2012 - Rome, Italy
Duration: Sep 23 2013Sep 27 2013

Fingerprint

bioavailability
Sediments
metal
Metals
sediment
Anoxic sediments
anoxic sediment
Oxic sediments
Desorption
desorption
sulfide
Biological Availability
oxic sediment
Biochemistry
Geochemistry
Physiology
Metal complexes
Organic carbon
biochemistry
Risk assessment

Keywords

  • Benthos
  • Bioavailability
  • Geochemistry
  • Metals
  • Risk assessment
  • Sediments

ASJC Scopus subject areas

  • Environmental Science(all)
  • Energy(all)
  • Earth and Planetary Sciences(all)

Cite this

Bioavailability of metals in contaminated sediments. / Paller, M. H.; Knox, A. S.

In: E3S Web of Conferences, Vol. 1, 02001, 23.04.2013.

Research output: Contribution to journalConference article

Paller, M. H. ; Knox, A. S. / Bioavailability of metals in contaminated sediments. In: E3S Web of Conferences. 2013 ; Vol. 1.
@article{23a2b67e46b64ff7aedbb7b5750f7402,
title = "Bioavailability of metals in contaminated sediments",
abstract = "Bioavailability controls the transfer of metals from sediments to ecological receptors and humans. It can rarely be predicted from total metal concentrations because it is affected by metal geochemistry in sediments as well as the biochemistry, physiology, and behavior of benthic organisms. There is no single approach for including bioavailability in risk assessments because of variability in site specific conditions and the difficulty of validating methods. Acid-volatile sulfide and simultaneously extracted metals are useful in predicting bioavailability in anoxic sediments containing sulfides that react to form insoluble metal complexes. This method can be improved by adjusting for organic carbon and other ligands that also bind free metals. Site-specific desorption Kd values calculated by sequential extraction methods can be useful in predicting bioavailable metal fractions in oxic and anoxic sediments. A modified desorption distribution coefficient (Kdg) can be calculated by extraction with the digestive gut fluids of sediment feeding organisms to account for the effects of ingestion on metal release from sediments. Recently developed in situ measurement technologies can accumulate dissolved metals in a controlled fashion that may correspond with bioavailable metal fractions in sediment. Successful evaluation of bioavailability requires the selection of methods suitable for the organisms and sediment environments under consideration. A weight-of-evidence approach that incorporates multiple lines of evidence can help address uncertainties and increase the likelihood of incorporating bioavailability into remedial decisions.",
keywords = "Benthos, Bioavailability, Geochemistry, Metals, Risk assessment, Sediments",
author = "Paller, {M. H.} and Knox, {A. S.}",
year = "2013",
month = "4",
day = "23",
doi = "10.1051/e3sconf/20130102001",
language = "English (US)",
volume = "1",
journal = "E3S Web of Conferences",
issn = "2267-1242",
publisher = "EDP Sciences",

}

TY - JOUR

T1 - Bioavailability of metals in contaminated sediments

AU - Paller, M. H.

AU - Knox, A. S.

PY - 2013/4/23

Y1 - 2013/4/23

N2 - Bioavailability controls the transfer of metals from sediments to ecological receptors and humans. It can rarely be predicted from total metal concentrations because it is affected by metal geochemistry in sediments as well as the biochemistry, physiology, and behavior of benthic organisms. There is no single approach for including bioavailability in risk assessments because of variability in site specific conditions and the difficulty of validating methods. Acid-volatile sulfide and simultaneously extracted metals are useful in predicting bioavailability in anoxic sediments containing sulfides that react to form insoluble metal complexes. This method can be improved by adjusting for organic carbon and other ligands that also bind free metals. Site-specific desorption Kd values calculated by sequential extraction methods can be useful in predicting bioavailable metal fractions in oxic and anoxic sediments. A modified desorption distribution coefficient (Kdg) can be calculated by extraction with the digestive gut fluids of sediment feeding organisms to account for the effects of ingestion on metal release from sediments. Recently developed in situ measurement technologies can accumulate dissolved metals in a controlled fashion that may correspond with bioavailable metal fractions in sediment. Successful evaluation of bioavailability requires the selection of methods suitable for the organisms and sediment environments under consideration. A weight-of-evidence approach that incorporates multiple lines of evidence can help address uncertainties and increase the likelihood of incorporating bioavailability into remedial decisions.

AB - Bioavailability controls the transfer of metals from sediments to ecological receptors and humans. It can rarely be predicted from total metal concentrations because it is affected by metal geochemistry in sediments as well as the biochemistry, physiology, and behavior of benthic organisms. There is no single approach for including bioavailability in risk assessments because of variability in site specific conditions and the difficulty of validating methods. Acid-volatile sulfide and simultaneously extracted metals are useful in predicting bioavailability in anoxic sediments containing sulfides that react to form insoluble metal complexes. This method can be improved by adjusting for organic carbon and other ligands that also bind free metals. Site-specific desorption Kd values calculated by sequential extraction methods can be useful in predicting bioavailable metal fractions in oxic and anoxic sediments. A modified desorption distribution coefficient (Kdg) can be calculated by extraction with the digestive gut fluids of sediment feeding organisms to account for the effects of ingestion on metal release from sediments. Recently developed in situ measurement technologies can accumulate dissolved metals in a controlled fashion that may correspond with bioavailable metal fractions in sediment. Successful evaluation of bioavailability requires the selection of methods suitable for the organisms and sediment environments under consideration. A weight-of-evidence approach that incorporates multiple lines of evidence can help address uncertainties and increase the likelihood of incorporating bioavailability into remedial decisions.

KW - Benthos

KW - Bioavailability

KW - Geochemistry

KW - Metals

KW - Risk assessment

KW - Sediments

UR - http://www.scopus.com/inward/record.url?scp=85016480925&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85016480925&partnerID=8YFLogxK

U2 - 10.1051/e3sconf/20130102001

DO - 10.1051/e3sconf/20130102001

M3 - Conference article

AN - SCOPUS:85016480925

VL - 1

JO - E3S Web of Conferences

JF - E3S Web of Conferences

SN - 2267-1242

M1 - 02001

ER -