Monosilicate adsorption by ferrihydrite and goethite at pH 3-6

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

The constant capacitance model and the Elovich equation were combined in the following mathematical expression enabling calculation of the amount of silicic acid adsorbed by iron oxides as a function of the Si concentration, pH, soil:solution ratio, and reaction time: [GRAPHICS] K(a1) is the protolytic surface constant and K(Si) is the stability constant for the Fe oxide-silicate surface complex; -logK(a1) = 6.40-0.54(8-pH) and logK(Si) = 3.85 for ferrihydrite and goethite. Good agreement was found between calculated Si adsorption and the amount actually found to be adsorbed by synthetic ferrihydrite and goethite at different pH (3-6), Si concentration (1-600 muM), solid:solution ratio (1:300, 1:1200) and reaction time (1-480h).
TidsskriftSoil Science
Udgave nummer1
Sider (fra-til)40-46
Antal sider7
StatusUdgivet - 1994

ID: 8028989