Details
| Original language | English |
|---|---|
| Pages (from-to) | 23850-23860 |
| Number of pages | 11 |
| Journal | Environmental Science and Pollution Research |
| Volume | 26 |
| Issue number | 23 |
| Early online date | 18 Jun 2019 |
| Publication status | Published - 1 Aug 2019 |
Abstract
The environmental fate of iodine is of general geochemical interest as well as of substantial concern in the context of nuclear waste repositories and reprocessing plants. Soils, and in particular soil organic matter (SOM), are known to play a major role in retaining and storing iodine. Therefore, we investigated iodide and iodate sorption by four different reference soils for contact times up to 30 days. Selective sequential extractions and X-ray absorption spectroscopy (XAS) were used to characterize binding behavior to different soil components, and the oxidation state and local structure of iodine. For iodide, sorption was fast with 73 to 96% being sorbed within the first 24 h, whereas iodate sorption increased from 11–41% to 62–85% after 30 days. The organic fraction contained most of the adsorbed iodide and iodate. XAS revealed a rapid change of iodide into organically bound iodine when exposed to soil, while iodate did not change its speciation. Migration behavior of both iodine species has to be considered as iodide appears to be the less mobile species due to fast binding to SOM, but with the potential risk of mobilization when oxidized to iodate.
Keywords
- Iodine, Migration, RefeSol, Selective sequential extraction, Speciation, XAS
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Chemistry
- Environmental Science(all)
- Pollution
- Environmental Science(all)
- Health, Toxicology and Mutagenesis
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In: Environmental Science and Pollution Research, Vol. 26, No. 23, 01.08.2019, p. 23850-23860.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sorption of iodine in soils
T2 - insight from selective sequential extractions and X-ray absorption spectroscopy
AU - Köhler, Fabian
AU - Riebe, Beate
AU - Scheinost, Andreas C.
AU - König, Claudia
AU - Hölzer, Alex
AU - Walther, Clemens
N1 - We thank the Siebold-Sasse Foundation for funding our research.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - The environmental fate of iodine is of general geochemical interest as well as of substantial concern in the context of nuclear waste repositories and reprocessing plants. Soils, and in particular soil organic matter (SOM), are known to play a major role in retaining and storing iodine. Therefore, we investigated iodide and iodate sorption by four different reference soils for contact times up to 30 days. Selective sequential extractions and X-ray absorption spectroscopy (XAS) were used to characterize binding behavior to different soil components, and the oxidation state and local structure of iodine. For iodide, sorption was fast with 73 to 96% being sorbed within the first 24 h, whereas iodate sorption increased from 11–41% to 62–85% after 30 days. The organic fraction contained most of the adsorbed iodide and iodate. XAS revealed a rapid change of iodide into organically bound iodine when exposed to soil, while iodate did not change its speciation. Migration behavior of both iodine species has to be considered as iodide appears to be the less mobile species due to fast binding to SOM, but with the potential risk of mobilization when oxidized to iodate.
AB - The environmental fate of iodine is of general geochemical interest as well as of substantial concern in the context of nuclear waste repositories and reprocessing plants. Soils, and in particular soil organic matter (SOM), are known to play a major role in retaining and storing iodine. Therefore, we investigated iodide and iodate sorption by four different reference soils for contact times up to 30 days. Selective sequential extractions and X-ray absorption spectroscopy (XAS) were used to characterize binding behavior to different soil components, and the oxidation state and local structure of iodine. For iodide, sorption was fast with 73 to 96% being sorbed within the first 24 h, whereas iodate sorption increased from 11–41% to 62–85% after 30 days. The organic fraction contained most of the adsorbed iodide and iodate. XAS revealed a rapid change of iodide into organically bound iodine when exposed to soil, while iodate did not change its speciation. Migration behavior of both iodine species has to be considered as iodide appears to be the less mobile species due to fast binding to SOM, but with the potential risk of mobilization when oxidized to iodate.
KW - Iodine
KW - Migration
KW - RefeSol
KW - Selective sequential extraction
KW - Speciation
KW - XAS
UR - http://www.scopus.com/inward/record.url?scp=85067827081&partnerID=8YFLogxK
U2 - 10.1007/s11356-019-05623-y
DO - 10.1007/s11356-019-05623-y
M3 - Article
C2 - 31214887
AN - SCOPUS:85067827081
VL - 26
SP - 23850
EP - 23860
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
SN - 0944-1344
IS - 23
ER -