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Related Concept Videos

The Soil Ecosystem02:23

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Updated: Jan 25, 2026

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils
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SPECIATION OF IODINE IN SOIL SOLUTION IN FOREST AND GRASSLAND SOILS IN ROKKASHO, JAPAN.

A Takeda1, Y Unno1, H Tsukada1

  • 1Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan.

Radiation Protection Dosimetry
|April 30, 2019
PubMed
Summary

Stable iodine (127I) in soil solution behaves similarly to radioiodine. Dissolved organic iodine (DOI) is prevalent in surface soils and linked to organic matter dynamics.

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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Radiochemistry

Background:

  • Iodine's chemical form in soil solution dictates its environmental behavior.
  • Stable iodine (127I) serves as a natural analogue for long-lived radioiodine (129I).
  • Understanding iodine speciation is crucial for assessing radioiodine migration in terrestrial ecosystems.

Purpose of the Study:

  • To investigate the chemical forms of stable iodine in soil solutions.
  • To analyze iodine distribution in soil profiles from forest and grassland sites.
  • To explore the relationship between dissolved organic iodine (DOI) and dissolved organic carbon (DOC).

Main Methods:

  • Soil samples collected at 5 cm depth intervals down to 20 cm.
  • Soil solution extraction via centrifugation.
  • Analysis of iodine speciation (iodide, iodate, DOI) and dissolved organic carbon (DOC).

Main Results:

  • Iodide and dissolved organic iodine (DOI) comprised nearly equal proportions of total iodine in soil solution; iodate was below detection limits.
  • The proportion of DOI was higher in the 0-5 cm soil layer compared to deeper layers (5-20 cm).
  • DOI concentration showed a positive correlation with DOC concentration, indicating influence from organic matter.

Conclusions:

  • Dissolved organic iodine (DOI) is a significant iodine species in surface soils.
  • Labile organic matter dynamics likely influence the behavior of DOI in the environment.
  • Findings provide insights into the fate of iodine, including radioiodine, in soil ecosystems.