Aquatic Geochemistry

, Volume 7, Issue 2, pp 155–171

Particle Size Distributions of Clay-rich Sediments and Pure Clay Minerals: A Comparison of Grain Size Analysis with Sedimentation Field-Flow Fractionation

  • Martin Hassellöv
  • Benny Lyvén
  • Henrik Bengtsson
  • Ragna Jansen
  • David R Turner
  • Ronald Beckett
Article

DOI: 10.1023/A:1017905822612

Cite this article as:
Hassellöv, M., Lyvén, B., Bengtsson, H. et al. Aquatic Geochemistry (2001) 7: 155. doi:10.1023/A:1017905822612

Abstract

Two clay-rich coastal sediment samples have been characterised together with three pure clays identified as major components of the sediment samples. The mineralogy of the sediments was determined by X-ray diffraction, and their bulk properties measured (organic carbon content, leachable iron and manganese, surface area and cation exchange capacity). A simple approach is used to model the properties of the sediments from those of their pure clay components. Good agreement is found for cation exchange capacity and specific surface area indicating that the clay minerals are the most important constituents influencing the sediments' surface properties. Particle size distributions were assessed by conventional grain size analysis, and also by Sedimentation Field-Flow Fractionation (SedFFF). These two approaches yield sharply differing size distributions; in particular, conventional grainsize analysis indicates a much greater proportion of submicron particles. Similar results are obtained from analysis of pure clays. The most likely reason for this is artifacts introduced in the unavoidable 1 μm prefractionation used for SedFFF.

Sedimentsize distributionfield-flow fractionationXRDclay mineralogyspecific surface areacation exchange capacity

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Martin Hassellöv
    • 1
  • Benny Lyvén
    • 1
  • Henrik Bengtsson
    • 2
  • Ragna Jansen
    • 1
  • David R Turner
    • 1
  • Ronald Beckett
    • 3
  1. 1.Analytical and Marine ChemistryGöteborg UniversityGöteborgSweden
  2. 2.Department of Earth SciencesGöteborg UniversityGöteborgSweden
  3. 3.CRC for Freshwater Ecology, Water Studies Centre and Department of ChemistryMonash UniversityMelbourneAustralia