Environmental Geochemistry and Health

, Volume 35, Issue 5, pp 553–567

The importance of solid-phase distribution on the oral bioaccessibility of Ni and Cr in soils overlying Palaeogene basalt lavas, Northern Ireland

  • Siobhan F. Cox
  • Merlyn C. M. Chelliah
  • Jennifer M. McKinley
  • Sherry Palmer
  • Ulrich Ofterdinger
  • Michael E. Young
  • Mark R. Cave
  • Joanna Wragg
Original Paper

DOI: 10.1007/s10653-013-9539-6

Cite this article as:
Cox, S.F., Chelliah, M.C.M., McKinley, J.M. et al. Environ Geochem Health (2013) 35: 553. doi:10.1007/s10653-013-9539-6

Abstract

Potentially toxic elements (PTEs) including nickel and chromium are often present in soils overlying basalt at concentrations above regulatory guidance values due to the presence of these elements in underlying geology. Oral bioaccessibility testing allows the risk posed by PTEs to human health to be assessed; however, bioaccessibility is controlled by factors including mineralogy, particle size, solid-phase speciation and encapsulation. X-ray diffraction was used to characterise the mineralogy of 12 soil samples overlying Palaeogene basalt lavas in Northern Ireland, and non-specific sequential extraction coupled with chemometric analysis was used to determine the distribution of elements amongst soil components in 3 of these samples. The data obtained were related to total concentration and oral bioaccessible concentration to determine whether a relationship exists between the overall concentrations of PTEs, their bioaccessibility and the soils mineralogy and geochemistry. Gastric phase bioaccessible fraction (BAF %) ranged from 0.4 to 5.4 % for chromium in soils overlying basalt and bioaccessible and total chromium concentrations are positively correlated. In contrast, the range of gastric phase BAF for nickel was greater (1.4–43.8 %), while no significant correlation was observed between bioaccessible and total nickel concentrations. However, nickel BAF was inversely correlated with total concentration. Solid-phase fractionation information showed that bioaccessible nickel was associated with calcium carbonate, aluminium oxide, iron oxide and clay-related components, while bioaccessible chromium was associated with clay-related components. This suggests that weathering significantly affects nickel bioaccessibility, but does not have the same effect on the bioaccessibility of chromium.

Keywords

Oral bioaccessibility Nickel Chromium Basalt Sequential extraction Solid-phase distribution 

Supplementary material

10653_2013_9539_MOESM1_ESM.pdf (27 kb)
Supplementary material 1 (PDF 27 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Siobhan F. Cox
    • 1
  • Merlyn C. M. Chelliah
    • 1
  • Jennifer M. McKinley
    • 2
  • Sherry Palmer
    • 1
  • Ulrich Ofterdinger
    • 1
  • Michael E. Young
    • 3
  • Mark R. Cave
    • 4
  • Joanna Wragg
    • 4
  1. 1.Environmental Engineering Research Centre, School of Planning, Architecture and Civil EngineeringQueen’s University BelfastBelfastUK
  2. 2.School of Geography, Archaeology and PalaeoecologyQueen’s University BelfastBelfastUK
  3. 3.Geological Survey of Northern IrelandBelfastUK
  4. 4.British Geological SurveyKeyworth, NottinghamUK

Personalised recommendations