Mechanisms of release of silicon from solution and from a solid gold matrix
- Royal Canadian Mint, Ottawa, Ontario (Canada)
- Pacific Northwest Laboratory, Richland, WA (United States)
It has been found that silicon can be determined directly in gold by solid sampling GFAAS with aqueous standards for calibration. Peak shapes for silicon from both aqueous standards and solid samples are similar and do not exhibit tailing that one would expect from an analyte occluded in a metal matrix. Experiments with silicon dried onto the surface of a gold sample confirm that silicon is on the surface prior to atomization. This can be explained by the analyte migrating to the surface via the convective cells induced by the temperature gradients in the sample in the early stages of the atomization cycle. Silicon originating from aqueous solutions does not have to migrate through a matrix and therefore is more readily atomized. Despite this, the temporal differences between silicon absorbance from solution and solid samples are not that dissimilar. One possible explanation is that the kinetics for silicon transport through the gold are quite fast and that once at the surface the rate of atomization is similar to that of the aqueous solution.
- OSTI ID:
- 191717
- Report Number(s):
- CONF-941098-; TRN: 95:006733-0073
- Resource Relation:
- Conference: FACSS XXI: 21st annual conference of the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS), St. Louis, MO (United States), 2-7 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of 21st annual conference of the Federation of Analytical Chemistry and Spectroscopy Societies; PB: 257 p.
- Country of Publication:
- United States
- Language:
- English
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