Abstract
To evaluate the extent to which contaminated sediments could introduce metals into marine food chains, gamma emitting radioisotopes of arsenic, cadmium and chromium were used to study their geochemical fractionation in estuarine sediments and bioavailability to deposit feeding polychaetes. Radioisotopes were added to sediments directly or via planktonic debris and were then fractionated with a sequential extraction scheme after aging for up to 90 days. The assimilation of ingested metals was positively related to their partitioning in the two most readily extractable (labile) sediment fractions and negatively related to refractory organic fractions, oxides, and pyrite. In comparison to uptake from ingested sediment, metal uptake from pore water was negligible. A metal bioaccumulation model, modified to consider their geochemical fractionation, was found to quantitatively predict metal concentrations in benthic polychaetes better than total metal concentrations in sediment. Metals need to desorb from ingested particles into gut fluid within the polychaete gut before they can be assimilated. (author)
Fisher, N. S.;
Baumann, Z.
[1]
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY (United States)
Citation Formats
Fisher, N. S., and Baumann, Z.
Application of Radiotracer Methodology for Understanding the Influence of Geochemical Fractionation on Metal Bioavailability in Estuarine Sediments.
IAEA: N. p.,
2013.
Web.
Fisher, N. S., & Baumann, Z.
Application of Radiotracer Methodology for Understanding the Influence of Geochemical Fractionation on Metal Bioavailability in Estuarine Sediments.
IAEA.
Fisher, N. S., and Baumann, Z.
2013.
"Application of Radiotracer Methodology for Understanding the Influence of Geochemical Fractionation on Metal Bioavailability in Estuarine Sediments."
IAEA.
@misc{etde_22122052,
title = {Application of Radiotracer Methodology for Understanding the Influence of Geochemical Fractionation on Metal Bioavailability in Estuarine Sediments}
author = {Fisher, N. S., and Baumann, Z.}
abstractNote = {To evaluate the extent to which contaminated sediments could introduce metals into marine food chains, gamma emitting radioisotopes of arsenic, cadmium and chromium were used to study their geochemical fractionation in estuarine sediments and bioavailability to deposit feeding polychaetes. Radioisotopes were added to sediments directly or via planktonic debris and were then fractionated with a sequential extraction scheme after aging for up to 90 days. The assimilation of ingested metals was positively related to their partitioning in the two most readily extractable (labile) sediment fractions and negatively related to refractory organic fractions, oxides, and pyrite. In comparison to uptake from ingested sediment, metal uptake from pore water was negligible. A metal bioaccumulation model, modified to consider their geochemical fractionation, was found to quantitatively predict metal concentrations in benthic polychaetes better than total metal concentrations in sediment. Metals need to desorb from ingested particles into gut fluid within the polychaete gut before they can be assimilated. (author)}
place = {IAEA}
year = {2013}
month = {Jul}
}
title = {Application of Radiotracer Methodology for Understanding the Influence of Geochemical Fractionation on Metal Bioavailability in Estuarine Sediments}
author = {Fisher, N. S., and Baumann, Z.}
abstractNote = {To evaluate the extent to which contaminated sediments could introduce metals into marine food chains, gamma emitting radioisotopes of arsenic, cadmium and chromium were used to study their geochemical fractionation in estuarine sediments and bioavailability to deposit feeding polychaetes. Radioisotopes were added to sediments directly or via planktonic debris and were then fractionated with a sequential extraction scheme after aging for up to 90 days. The assimilation of ingested metals was positively related to their partitioning in the two most readily extractable (labile) sediment fractions and negatively related to refractory organic fractions, oxides, and pyrite. In comparison to uptake from ingested sediment, metal uptake from pore water was negligible. A metal bioaccumulation model, modified to consider their geochemical fractionation, was found to quantitatively predict metal concentrations in benthic polychaetes better than total metal concentrations in sediment. Metals need to desorb from ingested particles into gut fluid within the polychaete gut before they can be assimilated. (author)}
place = {IAEA}
year = {2013}
month = {Jul}
}