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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Bibliographic Details
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
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary: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
ISSN:0003-2700
1520-6882
DOI:10.1021/ac00175a007