Short-term iodine dynamics in soil solution

Humphrey, Olivier S.; Young, Scott D.; Crout, Neil M.J.; Bailey, Elizabeth H.; Ander, E. Louise; Watts, Michael J.. 2020 Short-term iodine dynamics in soil solution. Environmental Science & Technology, 54 (3). 1443-1450. 10.1021/acs.est.9b02296

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Official URL: http://dx.doi.org/10.1021/acs.est.9b02296

Abstract/Summary

Assessing the reactions of iodine (I) in soil is critical to evaluate radioiodine exposure and understand soil-to-crop transfer rates. Our mechanistic understanding has been constrained by method limitations in assessing the dynamic interactions of iodine between soil solution and soil solid phase over short periods (hours). We use microdialysis to passively extract soil solution spiked with radioiodine (129I– and 129IO3–) to monitor short-term (≤40 h) in situ fixation and speciation changes. We observed greater instantaneous adsorption of 129IO3– compared to 129I– in all soils and the complete reduction of 129IO3– to 129I– within 5 h of addition. Loss of 129I from solution was extremely rapid; the average half-lives of 129I– and 129IO3– in soil solution were 4.06 and 10.03 h, respectively. We detected the presence of soluble organically bound iodine (org-129I) with a low molecular weight (MW) range (0.5–5 kDa) in all soils and a slower (20–40 h) time-dependent formation of larger MW org-I compounds (12–18 kDa) in some samples. This study highlights the very short window of immediate availability in which I from rainfall or irrigation remains in soil solution and available to crops, thus presenting significant challenges to phytofortification strategies in soil-based production systems.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1021/acs.est.9b02296
ISSN:	0013-936X
Date made live:	30 Jan 2020 09:08 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/526648

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1021/acs.est.9b02296

ISSN:

0013-936X

Date made live:

30 Jan 2020 09:08 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/526648