固体直接进样技术的发展及其关键.pdfVIP

Applied Spectroscopy Reviews , 41: 377–400, 2006 Copyright # Taylor Francis Group, LLC ISSN 0570-4928 print/1520-569X online DOI: 10.1080/05704920600726167 Current Status of Direct Solid Sampling for Electrothermal Atomic Absorption Spectrometry—A Critical Review of the Development between 1995 and 2005 ´ Maria Goreti R. Vale and Nedio Oleszczuk ´ Instituto de Quımica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil Walter N. L. dos Santos ´ Universidade Estadual de Santa Cruz, Campus Prof. Soane Nazare de ´ Andrade, Rodovia Ilheus-Itabuna, BA, Brazil Abstract: The literature about direct solid sampling (SS) and slurry sampling atomic absorption spectrometry (AAS) over the past decade has been surveyed critically. It became apparent that a very significant change had occurred, particularly in the relation between the two major techniques used for that purpose. In the 1990s, slurry sampling was typically considered the technique of choice, combining the significant advantages of the solid and the liquid sampling methods, at least in part because of the availability of a commercial accessory for automatic slurry sampling. The situation is completely inverted now, as the above accessory has been discontinued and rugged and reliable accessories for direct SS became available. Direct SS electro- thermal (ET) AAS has been shown to provide the best limits of detection because of the absence of any dilution and a minimal risk of contamination. Calibration against aqueous standards ap