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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/4573

Title: Extraction and purification of quartz in rock using hot-phosphoric acid for in situ cosmogenic exposure dating.
Authors: Misfud, C
Fujioka, T
Fink, D
Keywords: EXTRACTION
PURIFICATION
QUARTZ
GRANITES
BERYLLIUM
ALUMINIUM
Issue Date: 1-Jan-2013
Publisher: Elsevier Science BV
Citation: Mifsud, C., Fujioka, T., & Fink, D. (2013). Extraction and purification of quartz in rock using hot-phosphoric acid for in situ cosmogenic exposure dating. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 294, 203-207.
Abstract: Quartz extraction and purification is essential for the successful measurement of Be-10 and Al-26 by AMS for exposure dating. The common procedure involves repetitive etching by ultrasonic heating and agitation in a dilute aqueous HF solution (2% w/w), which has proven adequate for quartz rich rock (i.e., granite, quartzite). We have developed an alternative method using hot phosphoric acid (250 degrees C), which preferentially dissolves silicates but not quartz. This method is particularly effective on samples with very low quartz abundance or with cryptocrystalline silica (i.e., greywacke, silcrete, chert) to enhance quartz recovery. We describe the method in detail and present data that compares the efficiency and the benefits of the two methods. © 2013, Elsevier Ltd.
URI: http://apo.ansto.gov.au/dspace/handle/10238/4573
ISSN: 0168-583X
Appears in Collections:Journal Articles

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