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On the mechanistic modeling of As(III) adsorption on gibbsite
R Weerasooriya1, H J Tobschall, H K D K Wijesekara
1Institut für Geologie und Mineralogie, Lehrstuhl für Angewandte Geologie, Friedrich-Alexander Universität, Schlossgarten 5, Nürnberg Erlangen D-91054, Germany. rweerasooriya@hotmail.com
Chemosphere
|April 17, 2003
Abstract:
Arsenite adsorption on gibbsite was examined as a function of pH, ionic strength (I) and contact time (t(C)). As(III) showed a weak affinity for gibbsite surface. The trends of pH=f(Gamma(ads)) curves have showed a marked deviation from a typical anion adsorption edge showing a maximum Gamma(ads) around pH approximately 8.2. The experimentally derived proton exchange ratio has always converged to zero when 0.26< summation operator [As(III)]<7 microM and 6.2