Journal
CHEMOSPHERE
Volume 57, Issue 10, Pages 1489-1494Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2004.08.066
Keywords
monomeric Al species; polymeric Al species; polysilicic acid; ferric ions; Al-27 NMR spectra
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Aluminium ions hydrolyse and polymerise into different species in water. Main aluminium species in aluminium coagulant solutions are monomeric Al species (Al-1) and polymeric Al species Al13O4(OH)(24)(7+) (Al-13). The aluminium species distribution in coagulant solutions can be influenced by many parameters. This paper studies influences of concentrations of total aluminium species (Al-t) and other species-OH-, polysilicic acid and ferric species, which were added in aluminium coagulant solutions, on the aluminium species distribution through 27 Al nuclear magnetic resonance (NMR) analysis. Results show that only Al-1 and no Al-13 exist in coagulant solutions at higher Al-t concentrations (over 1 mol l(-1)), while both species exist at lower Al-t concentrations (0.1 mol l(-1)). The increase of OH/Al value (molar ratio) increases the concentration of Al-13 in coagulant solutions, while the addition of polysilicic acid and ferric species decreases the concentration of Al-13. (C) 2004 Elsevier Ltd. All rights reserved.
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