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Dissolution of fluoride complexes following microwave-assisted hydrofluoric acid digestion of marine sediments
Citation
Muralti, JM and McManus, J and Mix, A and Chase, Z, Dissolution of fluoride complexes following microwave-assisted hydrofluoric acid digestion of marine sediments, Talanta, 89 pp. 195-200. ISSN 0039-9140 (2012) [Refereed Article]
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DOI: doi:10.1016/j.talanta.2011.11.081
Abstract
Microwave-assisted, hydrofluoric acid digestion is an increasingly common tool for the preparation of
marine sediment samples for analysis by a variety of spectrometric techniques. Here we report that
analysis of terrigenous-dominated sediment samples occasionally results in anomalously low values for
several elements, including Al, Ba, Ca, Mg, and Sr. Measured concentrations of these elements increased
with time between sample preparation and sample analysis, reaching stable values after 829 days. This
lag is explained by the formation and subsequent dissolution of poorly soluble fluoride phases during
digestion. Other elements, such as Fe, Mn, and Ti, showed little or no lag and were quickly measurable
at a stable value. Full re-dissolution of the least soluble fluorides, which incorporate Al and Mg, requires
up to four weeks at room temperature, and this duration can vary among sedimentary matrices. This
waiting time can be reduced to 6 days (or shorter) if the samples are heated to
∼60 °C for 24 h.
Item Details
Item Type: | Refereed Article |
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Keywords: | microwave digestion, insoluble fluorides, hydrofluoric acid, marine sediments, trace metals |
Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Oceanography not elsewhere classified |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Chase, Z (Professor Zanna Chase) |
ID Code: | 76146 |
Year Published: | 2012 |
Web of Science® Times Cited: | 40 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2012-02-29 |
Last Modified: | 2013-05-03 |
Downloads: | 3 View Download Statistics |
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