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The trace element selenium (Se) is a micronutrient required by humans for important biological functions. Despite its importance for human health, the sources and processes that control the large-scale spatial distribution of Se in the environment remain unclear. Similar patterns of rainfall and soil Se concentrations, e.g. in Southern China, suggest that rainfall may be an important source of Se to soils. With the goal of exploring rainfall as a source of Se to soils, we examined climatic and geochemical variables in a sediment sequence from the Loess Plateau of Central China. We used multiple analytical methods to investigate Se concentrations and speciation, which is a main factor controlling environmental Se mobility. Speciation of Se could not be directly measured due to the low concentrations (< 70 mg Se per kg sediment). However by carrying out batch leaching experiments, followed by ion chromatography-inductively coupled plasma mass spectrometry analysis, we could quantify the maximum concentrations of Se species that could have been removed from these sediments by natural leaching processes. This amount was low, indicating that these sediments are a suitable environmental archive. Furthermore, speciation of iron was analyzed using X-ray absorption spectroscopy, since different iron minerals can have different binding capacities for Se, which influences the mobility of Se. Comparisons between results from geochemical analyses and climate variables

Using Multiple Geochemical Techniques to Investigate Rainfall as a Potential Source of Selenium to Soils