The transformation and migration of selenium in soil under different Eh conditions
- 173 Downloads
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.
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.
KeywordsIron oxides Redox potential Selenium Soil
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).
- Hingston FJ, Posner AM, Quirk JP (1968) Adsorption of selenite by goethite, adsorption from aqueous solution. Am Chem Soc:82–90Google Scholar
- Jensen MB, Hansen HCB, Nielsen NE, Magid J (1998) Phosphate mobilization and immobilization in two soils incubated under simulated reducing conditions. Acta Agric Scand Sect B Soil Plant Sci 48:11–17Google Scholar
- Medicine, F.a.N.B.-U.I.o (2000) Dietary references intakes for vitamin C, vitamin E, selenium and carotenoids. National Academy Press, WashingtonGoogle Scholar
- NIST X-ray photoelectron spectroscopy database, NIST standard reference database 20, version https://srdata.nist.gov/xps/Default.aspx
- Rayman MP (2008) Food-chain selenium and human health: emphasis on intake. Br J Nutr 100:254–268Google Scholar
- Shaheen SM, Frohne T, White JR, DeLaune RD, Rinklebe J (2017) Redox-induced mobilization of copper, selenium, and zinc in deltaic soils originating from Mississippi (USA) and Nile (Egypt) River Deltas: a better understanding of biogeochemical processes for safe environmental management. J Environ Manag 186:131–140CrossRefGoogle Scholar