ABSTRACT
Selenium (Se) has a very narrow margin between the nutritionally required and toxic concentrations. Se toxicity to humans is rarely observed under naturally occurring environmental conditions, except for people living in the Enshi region of Hubei Province in China. Se has a very narrow margin between the nutritionally required and toxic concentrations. Se toxicity to humans is rarely observed under naturally occurring environmental conditions, except for people living in the Enshi region of Hubei Province in China. Selenium-enriched vegetables (such as mushroom, garlic, onion, and leek) can be important dietary supplements of Se for people living in Se-deficient areas. X-ray absorption near-edge spectroscopy technique for Se speciation was developed approximately a decade ago. Selenium K-edge X-ray absorption near-edge spectroscopy is sensitive to the chemical form and has previously been used for the analysis of organic and inorganic Se in different environment samples.
