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Journal of Soils and Sediments

, Volume 18, Issue 9, pp 2935–2947 | Cite as

The transformation and migration of selenium in soil under different Eh conditions

  • Jianxin Fan
  • Yu Zeng
  • Jiaoxia Sun
Soils, Sec 3 • Remediation and Management of Contaminated or Degraded Lands • Research Article
  • 184 Downloads

Abstract

Purpose

Soil selenium (Se) sequestration and transformation, which are strongly controlled by soil redox conditions, are critical for understanding the mobility and bioavailability in the environment. Thus, the effect of redox potential on Se transformation was investigated for exploring the release mechanism of Se in soil.

Materials and methods

Soils were incubated under anoxic condition in four treatments at room temperature over 56 days, and the soil solution pH, Eh, and Fe and Se concentrations were measured at given reaction time. The sequential extraction and X-ray photoelectron spectroscopy (XPS) were used to obtain the species distribution of Se in soil. High-resolution transmission electron microscopy (HR-TEM) was employed to observe morphology characteristic of soil.

Results and discussion

Parts of soil Se can be released into solution, and Se speciation in soil changed during the incubation period. XPS and sequential extraction analyses revealed that the primary speciation of Se in soil was elemental Se, and metallic selenides were formed under aerobic condition. Moreover, XPS and HR-TEM data revealed the crystalline state of iron oxides in soil changed after anoxic incubation, and certain amorphous iron oxides were formed.

Conclusions

Se release is activated by short-term incubation, whereas Se can be transformed into less soluble state after long-term incubation. Organic matter takes extremely an important role in Fe oxide reductive dissolution and Se transformation. This study is useful to understand the environmental behaviors of Se and enhance the application of Se fertilizers effectively and safely in Se deficiency area.

Keywords

Iron oxides Redox potential Selenium Soil 

Notes

Funding information

This work was financially supported by the National Natural Science Foundation of China (No. 41401255, 51508057), the Natural Science Foundation of Chongqing of China (No. cstc2015jcyjA20018), China Postdoctoral Science Foundation (2016M602633), Chongqing Postdoctoral Science Foundation Special Funded Project (Xm2017048), and Innovation Project of University Students’ Research in Chongqing (201710618024).

Supplementary material

11368_2018_1980_MOESM1_ESM.doc (37 kb)
ESM 1 (DOC 37 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Chongqing Engineering Laboratory of Environmental Hydraulic Engineering, Chongqing Municipal Development and Reform CommissionChongqing Jiaotong UniversityChongqingChina
  2. 2.College of Resources and EnvironmentSouthwest UniversityChongqingChina

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