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Effects of incubation time and filtration method on Kd of indigenous selenium and iodine in temperate soils

Al Mahayni, T.; Bailey, Elizabeth H.; Crout, Neil M.J.; Shaw, George

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Authors

T. Al Mahayni

LIZ BAILEY LIZ.BAILEY@NOTTINGHAM.AC.UK
Professor of Environmental Geochemistry

Neil M.J. Crout

George Shaw



Abstract

In this study, the effects of incubation time and the method of soil solution extraction and filtration on the empirical distribution coefficient (Kd) obtained by de-sorbing indigenous selenium (Se) and iodine (I) from arable and woodland soils under temperate conditions were investigated.
Incubation time had a significant soil- and element- dependent effect on the Kd values, which tended to decrease with the incubation time. Generally, a four-week period was sufficient for the desorption Kd value to stabilise. Concurrent solubilisation of soil organic matter (OM) and release of organically-bound Se and I was probably responsible for the observed decrease in Kd with time. This contrasts with the conventional view of OM as a sink for Se and I in soils. Selenium and I Kd values were not significantly affected by the method of soil solution extraction and filtration.
The results suggest that incubation time is a key criterion when selecting Se and I Kd values from the literature for risk assessments. Values derived from desorption of indigenous soil Se and I might be most appropriate for long-term assessments since they reflect the quasi-equilibrium state of their partitioning in soils.

Citation

Al Mahayni, T., Bailey, E. H., Crout, N. M., & Shaw, G. (2017). Effects of incubation time and filtration method on Kd of indigenous selenium and iodine in temperate soils. Journal of Environmental Radioactivity, 177, 84-90. https://doi.org/10.1016/j.jenvrad.2017.06.004

Journal Article Type Article
Acceptance Date Jun 3, 2017
Online Publication Date Jun 17, 2017
Publication Date Oct 1, 2017
Deposit Date Aug 31, 2017
Publicly Available Date Aug 8, 2018
Journal Journal of Environmental Radioactivity
Print ISSN 0265-931X
Electronic ISSN 1879-1700
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 177
Pages 84-90
DOI https://doi.org/10.1016/j.jenvrad.2017.06.004
Keywords Soil indigenous selenium and iodine; Distribution coefficient (Kd); Incubation time; Soil solution = extraction; Rhizon soil moisture samplers
Public URL https://nottingham-repository.worktribe.com/output/965870
Publisher URL http://www.sciencedirect.com/science/article/pii/S0265931X17304216
Contract Date Aug 8, 2018

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