Low-pressure vaporization for graphite furnace atomic absorption spectrometry

A low-pressure graphite furnace atomic absorption spectrometry technique is presented which, for aqueous Pb samples at 0.15 torr, results in a two orders of magnitude reduction in sensitivity and a working range that extends to approx 1 mu g. The limit of detection is 5 ng of Pb. Sticking is diminis...

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Published in:Analytical chemistry (Washington) 1988-12, Vol.60 (24), p.2680-2683
Main Authors: Hassell, D. C, Rettberg, T. M, Fort, F. A, Holcombe, J. A
Format: Article
Language:English
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Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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container_issue 24
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container_title Analytical chemistry (Washington)
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creator Hassell, D. C
Rettberg, T. M
Fort, F. A
Holcombe, J. A
description A low-pressure graphite furnace atomic absorption spectrometry technique is presented which, for aqueous Pb samples at 0.15 torr, results in a two orders of magnitude reduction in sensitivity and a working range that extends to approx 1 mu g. The limit of detection is 5 ng of Pb. Sticking is diminished for refractory analytes (e.g. vanadium), thus reducing memory effects and peak tailing. Solid sample analysis is demonstrated for Pb in a phosphorized Cu alloy (SRM 1253a), for which low-pressure atomization minimizes Cu vaporization while allowing for quantitative determination of Pb when compared to a calibration curve prepared from aqueous standards. In addition, the appearance of multiple peaks suggests the use of the technique for differentiating between various forms or locations of Pb within the sample. This is in contrast to atmospheric vaporization where only one broad peak is observed. 9 ref.--AA
doi_str_mv 10.1021/ac00175a007
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subjects Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
title Low-pressure vaporization for graphite furnace atomic absorption spectrometry
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