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Comparison of hydrolysis products of AlCl 3 · 6H 2 O in different concentrations by electrospray ionization time of flight mass spectrometer (ESI TOF MS)

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Hydrolysis of 0.100, 0.010, and 0.001molL −1 aqueous solutions of AlCl 3 ·6H 2 O, each at two pH values ranging from 3.27 to 7.00, was compared by electrospray ionization time-of-flight mass spectrometry. The differences between 4h and 14day aged solutions were also studied. Various charges and compositions for species of the same size were observed. At lower pH values, dimeric and trimeric aluminium oxo-hydroxo-complexes were the major molecular species. With higher pH levels, precipitation and formation of took place. Multiple charged signals assigned to polynuclear complexes (Al 10 –Al 15 ) were found at a narrow pH area range before precipitation occurred. The diversity of different species increased strongly as a function of concentration. The pH of the solution dominated the profile even more than the concentration. All the main species were formed in 4h.
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Keywords: Aluminium; Distribution; ESI TOF MS; Hydrolysis; Polymeric complexes; Speciation

Document Type: Research Article

Affiliations: 1: Water Resources and Environmental Engineering Laboratory, University of Oulu, Linnanmaa, PO Box 4000, 90014 University of Oulu, Finland 2: Kemira Oyj, PO Box 171, 90101 Oulu, Finland 3: Department of Chemistry, University of Oulu, Linnanmaa, PO Box 3000, 90014 University of Oulu, Finland

Publication date: November 15, 2006

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