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Progress in direct solid sampling analysis using line source and high-resolution continuum source electrothermal

Bernhard Welz1, Maria Goreti R Vale, Daniel L G Borges

  • 1Departamento de Química, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brazil. w.bernardo@terra.com.br

Analytical and Bioanalytical Chemistry
|September 6, 2007
PubMed
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Direct solid sample analysis using electrothermal atomic absorption spectrometry often utilizes aqueous standards for calibration, challenging the necessity of matrix-matched certified reference materials. High-resolution continuum source atomic absorption spectrometry offers improved spectral interference correction for accurate results.

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Direct solid sample analysis is crucial for elemental determination.
  • Electrothermal atomic absorption spectrometry (ETAAS) is a common technique.
  • Accurate calibration remains a challenge in solid sample analysis.

Purpose of the Study:

  • To review recent literature on direct solid sample analysis using ETAAS.
  • To evaluate the necessity of certified reference materials for calibration.
  • To highlight advancements in spectral interference correction.

Main Methods:

  • Literature review of publications from the past 10-15 years.
  • Analysis of calibration strategies employed in direct solid sample analysis.
  • Comparison of conventional ETAAS with high-resolution continuum source atomic absorption spectrometry (HR-CS AAS).

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Main Results:

  • The majority of recent studies use aqueous standards for calibration, not matrix-matched certified reference materials.
  • Certified reference materials do not always guarantee accurate results due to spectral interferences.
  • HR-CS AAS effectively corrects spectral interferences, enabling straightforward program optimization and simultaneous background correction.
  • Aqueous standards are successfully employed for calibration in all HR-CS AAS applications for direct solid sample analysis.

Conclusions:

  • The requirement for matrix-matched certified reference materials in direct solid sample analysis is not universally supported by recent literature.
  • High-resolution continuum source atomic absorption spectrometry offers a robust solution for spectral interferences, facilitating accurate analysis with aqueous standards.