Accession Number:

ADA609869

Title:

Sediment Mixing in Coastal Regions: The Impact of Animal Digestion on Radionuclide Tracers

Descriptive Note:

Annual rept.

Corporate Author:

MAINE UNIV AT WALPOLE DARLING MARINE CENTER

Personal Author(s):

Report Date:

2000-09-30

Pagination or Media Count:

4.0

Abstract:

We wish to further our understanding of the solubilization of metallic elements during passage of marine sediments through the digestive systems of deposit feeders. Of particular interest are the implications of this solubilization for the dissolution of metallic contaminants in sediments and the metallic radionuclides used in measuring sediment bioturbation. We will test for the chemical mechanisms by which various metals are solubilized by the ligands present in digestive fluids. We hope to isolate specific ligand groups involved in binding the metals. We will also see if the metallic radionuclides used in bioturbation, such as Th-234 and Pb-210, are significantly solubilized by digestive fluids. If so, we will assess what matrices holding these radionuclides are particularly vulnerable to the dissolution process. Implications for bioturbation modelling will be assessed based on these results.

Subject Categories:

  • Biology
  • Anatomy and Physiology
  • Hydrology, Limnology and Potamology
  • Properties of Metals and Alloys
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE