Methods of Analysis for the Determination of Selenium in Biological, Geological, and Water Samples

Selenium is widely distributed in the hydrosphere, lithosphere, atmosphere, and biosphere of the earth in chemically different oxidation states: selenide (Se2-), elemental selenium (Se°), selenite (Se4+), selenate (Se6+), and organic selenium (organically complexed species such as selenomethionine or selenocysteine).