Sorption and speciation of iodine in groundwater system: The roles of organic matter and organic-mineral complexes

Journal of Contaminant Hydrology
Junxia LiKun Qian

Abstract

Characterizing the properties of main host of iodine in soil/sediment and the geochemical behaviors of iodine species are critical to understand the mechanisms of iodine mobilization in groundwater systems. Four surface soil and six subsurface sediment samples were collected from the iodine-affected area of Datong basin in northern China to conduct batch experiments and to evaluate the effects of NOM and/or organic-mineral complexes on iodide/iodate geochemical behaviors. The results showed that both iodine contents and kf-iodate values had positive correlations with solid TOC contents, implying the potential host of NOM for iodine in soil/sediment samples. The results of chemical removal of easily extracted NOM indicated that the NOM of surface soils is mainly composed of surface embedded organic matter, while sediment NOM mainly occurs in the form of organic-mineral complexes. After the removal of surface sorbed NOM, the decrease in kf-iodate value of treated surface soils indicates that surface sorbed NOM enhances iodate adsorption onto surface soil. By contrast, kf-iodate value increases in several H2O2-treated sediment samples, which was considered to result from exposed rod-like minerals rich in Fe/Al oxyhydroxide/oxides....Continue Reading

Citations

Nov 12, 2019·Frontiers in Microbiology·Christopher E BagwellNikolla P Qafoku
Jul 20, 2019·The Science of the Total Environment·James J NeewayNikolla P Qafoku
Jan 27, 2020·The Science of the Total Environment·Robert C MooreVicky L Freedman

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