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An electrothermal atomic absorption spectrometer using semiconductor diode lasers and a tungsten coil atomizer:
V Krivan1, P Barth, C Schnürer-Patschan
1Sektion Analytik und Höchstreinigung, Universität Ulm, Germany.
Analytical Chemistry
|September 16, 1998
Summary
A novel atomic absorption spectrometer uses a laser diode and tungsten coil, offering a simpler, smaller, and cheaper alternative with inherent background correction. This new system demonstrates high detection power for elements like aluminum and chromium in various sample types.
Area of Science:
- Analytical Chemistry
- Spectroscopy
Background:
- Established atomic absorption spectrometers can be complex and costly.
- There is a need for more accessible and portable analytical instrumentation.
Purpose of the Study:
- To introduce a new, simplified atomic absorption spectrometer design.
- To evaluate its performance for elemental analysis in diverse matrices.
Main Methods:
- Utilized a laser diode as the light source and a tungsten coil as the atomizer.
- Employed the standard addition method for calibration.
- Applied the slurry sampling technique for solid samples.
Main Results:
- Achieved low detection limits for aluminum and chromium in aqueous solutions (0.9 ng/mL and 0.03 ng/mL) and serum (2.5 ng/mL and 0.3 ng/mL).
- Demonstrated effective analysis of aluminum and chromium in graphite and titanium dioxide using slurry sampling, with detection limits down to 0.02 µg/g.
- Verified accuracy through comparison with other analytical methods.
Conclusions:
- The new atomic absorption spectrometer offers a cost-effective, compact, and high-performance solution.
- Its inherent background correction and high detection power make it suitable for on-site and on-line elemental analysis.