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Bioscience Horizons 2008 1(1):38-43; doi:10.1093/biohorizons/hzn003
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© Oxford University Press 2008

Dissolution kinetics of clinoptilolite and heulandite in alkaline conditions

Alissa Cotton

School of Biosciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

*Corresponding author: Tel: +44 (0) 115 951 6255. Email: liz.bailey{at}nottingham.ac.uk

Supervisor: Dr. Elizabeth Bailey*, School of Biosciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK.


  Abstract

Temperature and pH-dependent dissolution kinetics of natural clinoptilolite and a ‘pure’ heulandite phase have been determined and compared. Si dissolution rates increased with increasing temperature and pH. Heulandite has a slightly higher dissolution rate than clinoptilolite in the pH range 8–10. Measured reaction order was 0.23 and 0.14 for clinoptilolite and heulandite, respectively. This is slightly lower than for other aluminosilicate phases at comparable temperatures. The measured dissolution rates indicate a 1 mm spherical crystal would dissolve in 38 848 years and 17 301 years for clinoptilolite and heulandite, respectively. If solution composition is maintained, and remains unsaturated with respect to Si, Al, etc., the presence of zeolites in the vicinity of an underground nuclear waste repository would be beneficial as a sorption barrier.

Key words: dissolution kinetics, clinoptilolite, heulandite

Submitted on 30 September 2007; accepted on 17 December 2007


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