T. Al Mahayni
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
Elizabeth H. Bailey firstname.lastname@example.org
Neil M.J. Crout email@example.com
George Shaw firstname.lastname@example.org
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|
|Peer Reviewed||Peer Reviewed|
|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|
|Keywords||Soil indigenous selenium and iodine; Distribution coefficient (Kd); Incubation time; Soil solution = extraction; Rhizon soil moisture samplers|
|Copyright Statement||Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0|
AlMahayni Manuscript Revised_01Jun2017_NC (003).pdf
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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