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Sensitivity of the acid-base properties of clays to the methods of preparation and measurement. 2. Evidence from continuous potentiometric titrations.
MedLine Citation:
PMID:  16009225     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The effects of experimental procedures on the acid-base consumption titration curves of montmorillonite suspension were studied using continuous potentiometric titration. For that purpose, the hysteresis amplitudes between the acid and base branches were found to be useful to systematically evaluate the impacts of storage conditions (wet or dried), the atmosphere in titration reactor, the solid-liquid ratio, the time interval between successive increments, and the ionic strength. In the case of storage conditions, the increase of the hysteresis was significantly higher for longer storage of clay in suspension and drying procedures compared to "fresh" clay suspension. The titration carried out under air demonstrated carbonate contamination that could only be cancelled by performing experiments under inert gas. Interestingly, the increase of the time intervals between successive increments of titrant strongly emphasized the amplitude of hysteresis, which could be correlated with the slow kinetic process specifically observed for acid addition in acid media. Thus, such kinetic behavior is probably associated with dissolution processes of clay particles. However, the resulting curves recorded at different ionic strengths under optimized conditions did not show the common intersection point required to define point of zero charge. Nevertheless, the ionic strength dependence of the point of zero net proton charge suggested that the point of zero charge of sodic montmorillonite could be estimated as lower than 5.
Authors:
Myriam Duc; Fabien Gaboriaud; Fabien Thomas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  289     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-07-12     Completed Date:  2006-11-24     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  148-56     Citation Subset:  -    
Affiliation:
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (UMR 7564), CNRS-UHP Nancy 1, Villers-lès-Nancy, France.
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