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Determination of arsenic by hydride generation with a long absorption cell for atomic absorption spectrometry

โœ Scribed by W.J. Wang; S. Hanamura; J.D. Winefordner

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
375 KB
Volume
184
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

A method is described for the determination of arsenic involving hydride generation and atomic absorption spectrometry with an improved long graphite-tube furnace capable of considerably higher temperatures than the conventional quartz-tube heaters. Arsine is generated with sodium tetrahydroborate, held in a nitrogen-cooled trap and then swept with helium into an alumina tube (19 cm long) placed within the graphite furnace. The optimum conditions for determination of arsenic are given. The detection limit is 0.2 ng ml-' with RSD of 2-3%. Results for various NBS Standard Reference Materials agreed well with expected values and were as follows: orchard leaves, 10 + 1 rg g-l; tomato leaves, 0.28 * 0.03 rg g"; bovine liver, 0.046 * 0.006 rg g-l.

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