The formation of polynuclear Al 13 under simulated natural conditions

Details The formation of polynuclear Al 13 under simulated natural conditions The formation of polynuclear Al 13 under simulated natural conditions

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3831f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 10, pp.3831-3838

Physics

1

Scientific paper

Polynuclear aluminum species can be formed in nature by the dissolution of Al-containing minerals, as a consequence of soil and surface water acidification, followed by neutralization processes. Under simulated natural conditions in the laboratory, i.e., by allowing acidic Al(III) solutions to flow over granulated marble at flow velocities of 3-4 mm/min, large fractions of monomeric Al(III) were transformed to the Al 13 O 4 (OH) 24 (H 2 O) 12 7+ polymer (thereafter referred to as Al 13 or Al 13 7+ ), which was measured by 27 Al-NMR spectroscopy. Over two-thirds of the monomeric Al(III) was converted to polynuclear Al 13 even when gibbsite particles were mixed with the marble granules. The Al 13 polymer was also formed in stirred batch experiments containing marble granules and dissolved phthalate or salicylate. The results suggest that Al 13 formation is easily possible in nature if the total Al(III) concentration is high enough. In these experiments, Al 13 was detected when the total dissolved Al(III) was 1.9 × 10 -4 mol/L. The minimum total Al(III) concentration required to produce Al 13 , which can be predicted from available thermodynamic data, is on the order of 10 -5 mol/L.

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