Evaluation of internal standardisation in electrothermal atomic absorption spectrometry

被引:29
作者
Radziuk, B
Romanova, NP
Thomassen, Y
机构
[1] Bodenseewerk Perkin Elmer & Co GmbH, D-88647 Uberlingen, Germany
[2] St Petersburg State Tech Univ, Dept Analyt Chem, St Petersburg 195251, Russia
[3] Natl Inst Occupat Hlth, N-0033 Oslo, Norway
来源
ANALYTICAL COMMUNICATIONS | 1999年 / 36卷 / 01期
关键词
D O I
10.1039/a809096c
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Significantly improved performance in electrothermal atomic absorption spectrometry is possible using an internal standardisation technique. A Perkin-Elmer SIMAA 6000 simultaneous multielement spectrometer was used to study the correlation between two integrated absorbance signals. The behaviour of Pb (analyte) in different urine, blood and placenta samples was compared to that of Bi or Tl used as the internal standards. All samples were spiked with known amounts of Pb and Bi or Tl. A satisfactory signal correlation (r = 0.94) between the integrated absorbances for spikes of the analyte and internal standard was observed with Bi as the internal standard. After signal correction, the relative standard deviation of the integrated absorbance for Pb spikes reduced from 29 to 7% for urine, from 19 to 2% for blood and from 22 to 4% for placenta. The mean difference between Pb concentration found in analysed samples by the method of additions and using an internal standard was 10%.
引用
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页码:13 / 16
页数:4
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