Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C

Details Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.1053f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 6, pp.1053-1062

Computer Science

2

Scientific paper

The solubility of gibbsite was measured at 35 and 80°C, and the solubility of portlandite was measured at 25, 35, and 80°C, each as a function of pH and malonate concentration. The gibbsite solubility data can be satisfactorily modelled using only one aqueous Al-malonate species. The data rule out all possible Al p (OH) q (Mal) r 3 p - q -2 r and Al p (OH) q (HMal) r 3 p - q - r stoichiometries except Al(Mal) 2 - and Al(OH ) 2 (HMal) 2 , each of which provides an excellent fit to all of the experimental solubility data. If Al(Mal) 2 - is the dominant species, the data constrain the value for the log of the dissociation constant of Al(Mal) 2 - to be -11.3 ± 1.0 and -14.5 ± 0.5 at 35 and 80°C, respectively. If Al(OH) 2 (HMal) 2 - is the dominant species, the values of its dissociation constant at 35°C and at 80°C are -27.3 ± 1.0 and -27.6 ± 0.5, respectively. The portlandite solubilities indicate that Ca(Mal) 0 is the dominant Ca-malonate complex, with values for the log of the dissociation constant of Ca(Mal) 0 of -2.4 ± 0.3, -2.4 ± 0.3, and -2.9 ± 0.3, at 25, 35, and 80°C, respectively. Thermodynamic modelling, using these results, indicates that Al-malonate complexation can potentially enhance the solubility of Al-bearing minerals by up to five orders of magnitude.

Affiliated with

Also associated with

No associations

Rating

Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Experimental study of aluminum and calcium malonate complexation at 25, 35, and 80°C will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-885531