Study of processes in the hydride generation atomic absorption spectrometry of antimony,arsenic and selenium |
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Authors: | J Agterdenbos |
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Institution: | Laboratory for Analytical Chemistry, State University of Utrecht, Croesestraat 77a, 3522 AD Utrecht The Netherlands;Department of Chemistry, Gadjah Mada University, Sekip Unit III, P.O. Box Bls 21, Yogyakarta Indonesia |
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Abstract: | Studies of the decomposition rate of the reducing agent sodium tetrahydroborate in alkaline and acidic media and of the reaction rate of the formation of the hydrides under the usual analytical conditions are described. The stripping of the hydrides with different lengths of the stripping coil, with different amounts of hydrogen in the carrier gas and with sodium hydroxide added during and after the stripping process are discussed. Some evidence for the existence of an intermediate during the decomposition reaction of the sodium tetrahydroborate is given. The role of temperature, hydrogen and oxygen during the atomization of the hydrides in an electrically heated quartz cuvette is discussed. Under certain conditions, antimony atoms form dimers or elemental antimony precipitates in the heated cuvette. |
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Keywords: | Hydride generation Antimony Arsenic Selenium |
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