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Measuring sorption coefficients and BET surface areas on intact drillcore and crushed granite samples
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.
KTH, School of Industrial Engineering and Management (ITM), Industrial Ecology.ORCID iD: 0000-0002-4530-3414
2008 (English)In: Radiochimica Acta, ISSN 0033-8230, Vol. 96, no 9-11, 673-677 p.Article in journal (Refereed) Published
Abstract [en]

In general sorption coefficients, K-d cat ion exchange capacity, CEC, and BET surface areas are measured on crushed rock samples because it is very time consuming to measure K-d and CEC on larger rock pieces as it takes a long time for the sorbing species to penetrate into and equilibrate a large sample. Also conventional sample holders for BET measurements are too small to hold a large sample. We have manufactured large sample holders for BET measurements and modified the equipment so that it is possible to measure BET surface areas on samples with 50 mm diameter and LIP to 100 mm length. Results are presented for intact pieces and compared to results on crushed material from the same drillcore. For K-d and CEC measurements we have developed a technique and equipment by which ions can be made to rapidly intrude into and equilibrate the internal surfaces of the same size samples as mentioned above. The method is based on electro-migration where the sample is placed between two vessels one with an anode and other with a cathode. The electric potential gradient drives the ions into and through the sample very much faster than molecular diffusion does. With Cs as the sorbing ion a few weeks were sufficient to equilibrate the 50 mm long sample. In previous diffusion experiments it took more than a year to equilibrate a 15 mm thick sample. A special mixing technique eliminates the development of low and high PH in the electrode compartments. K-d results from measurements on an intact drillcore are presented and comparison is made with results obtained on crushed material from the same bore core. The results from the sorption experiments are compared with the results from the BET surface area determinations in an attempt to evaluate the use of the BET surface area as a proxy for sorption behaviour.

Place, publisher, year, edition, pages
2008. Vol. 96, no 9-11, 673-677 p.
Keyword [en]
Sorption, Electromigration, Crystalline rock, Granite, BET-surface area, Specific surface area, ROCK
Identifiers
URN: urn:nbn:se:kth:diva-13631DOI: 10.1524/ract.2008.1552ISI: 000261096500023Scopus ID: 2-s2.0-56649094297OAI: oai:DiVA.org:kth-13631DiVA: diva2:326252
Note
QC 20100622Available from: 2010-06-22 Created: 2010-06-22 Last updated: 2010-07-19Bibliographically approved
In thesis
1. New Methods for the Determination of Sorption Capacities and Sorption-Related Properties of Intact Rock
Open this publication in new window or tab >>New Methods for the Determination of Sorption Capacities and Sorption-Related Properties of Intact Rock
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 77 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009:19
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-10636 (URN)978-91-7415-332-3 (ISBN)
Public defence
2009-06-12, K1, KTH, Teknikringen, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100622Available from: 2009-06-08 Created: 2009-06-08 Last updated: 2011-10-10Bibliographically approved

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Malmström, Maria

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