Monosilicate adsorption by ferrihydrite and goethite at pH 3-6
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Monosilicate adsorption by ferrihydrite and goethite at pH 3-6. / Hansen, Hans Christian Bruun; Raben-Lange, B.; Raulund-Rasmussen, Karsten; Borggaard, Ole Kragholm.
In: Soil Science, Vol. 158, No. 1, 1994, p. 40-46.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Monosilicate adsorption by ferrihydrite and goethite at pH 3-6
AU - Hansen, Hans Christian Bruun
AU - Raben-Lange, B.
AU - Raulund-Rasmussen, Karsten
AU - Borggaard, Ole Kragholm
PY - 1994
Y1 - 1994
N2 - 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).
AB - 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).
M3 - Journal article
VL - 158
SP - 40
EP - 46
JO - Soil Science
JF - Soil Science
SN - 0038-075X
IS - 1
ER -
ID: 8028989