State Water Resources Research Institute Program
Project ID: 2007WV105B
Title: WRI 99 - Selenium Speciation and Removal
Project Type: Research
Start Date: 3/01/2007
End Date: 2/28/2008
Congressional District: First
Focus Categories: Water Quality, Treatment, Surface Water
Keywords: AMD Treatment, Anion Sorption
Principal Investigators: McDonald, Louis M; Herd, Richard
Federal Funds: $ 6,993
Non-Federal Matching Funds: $ 28,844
Abstract: Environmental selenium can occur as Se(0) [metal], Se(IV) [selenite], and Se(VI) [selenate]. Stability diagrams indicate that conditions found in acidic, high iron mine drainage favor Se(0), whereas neutral, low iron drainage favors Se(IV) or Se(VI). Se(VI) is the most mobile form, but it requires a very oxic, high pH environment and is easily reduced. Ferrous and ferric iron are known to intereact with both Se(IV) and SE(VI), either reducing the Se to metal or adsorbing it on particulate oxides.
The interactions of selenium with iron in natural systems will be investigated in order to determine conditions of minimal mobility. Of particular interest are the kenetic stability of Se(0), the adsorption properties of Se(IV) on iron oxides, and the chemistry of selenium and "green rust", an amorphous ferrous hydroxide material.
Progress/Completion Report, PDF