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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

Authors

T. Al Mahayni

Elizabeth H. Bailey liz.bailey@nottingham.ac.uk

Neil M.J. Crout neil.crout@nottingham.ac.uk

George Shaw george.shaw@nottingham.ac.uk



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.

Journal Article Type Article
Publication Date Oct 1, 2017
Journal Journal of Environmental Radioactivity
Print ISSN 0265-931X
Electronic ISSN 1879-1700
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 177
Pages 84-90
APA6 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. doi:10.1016/j.jenvrad.2017.06.004
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
Publisher URL http://www.sciencedirect.com/science/article/pii/S0265931X17304216
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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