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Issue 1, 1997
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Reduction of Background Absorption in the Measurement of Cadmium,Lead and Selenium in Whole Blood Using Iridium-sputtered Graphite Tubes inElectrothermal Atomic Absorption Spectrometry

Abstract

The thermal behaviour during pyrolysis and of the vapour phase during atomization for Cd, Pb and Se in acid-digested whole blood using Ir-sputtered tubes is described. The performance of Ir as a permanent modifier was affected unfavourably by the complex matrix compared with conventional modifiers. Background absorption was measured using an atomic absorption spectrometer in addition to a diode-array spectrometer and compared with the background obtained in pyrolytic graphite-coated graphite tubes. Both methods of measurement indicated that the background was much reduced in the Ir-sputtered tubes. The decrease in background absorption improves conditions for the measurement of these elements. Background molecular absorption was also measured as a function of time. Molecular species such as NO were detected in the vapour phase using pyrolytic graphite-coated tubes, whereas CS and CO were detected using Ir-sputtered tubes.

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Article type: Paper
DOI: 10.1039/A604783A
J. Anal. At. Spectrom., 1997,12, 81-84

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    Reduction of Background Absorption in the Measurement of Cadmium, Lead and Selenium in Whole Blood Using Iridium-sputtered Graphite Tubes in Electrothermal Atomic Absorption Spectrometry

    CORNELIUS J. RADEMEYER, B. RADZIUK, N. ROMANOVA, Y. THOMASSEN and P. TITTARELLI, J. Anal. At. Spectrom., 1997, 12, 81
    DOI: 10.1039/A604783A

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