Selenium Coal Ash (IMAGE)
Caption
A nanoscale view of two different sources of coal ash shows major differences in how selenium is part of its makeup. On the left, selenium (red) is diffusely distributed around multiple large ash grains made of iron (green) and carbon (blue). On the right, selenium is bound to the surface of ash grains made of iron and carbon, making it more difficult for the selenium to escape.
Credit
Helen Hsu-Kim, Duke University
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