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Optimization of atomic fluorescence measurements with a microcomputer-based time-multiplex multiple-slit

S Ghaffari¹, J D Ingle

¹Department of Chemistry, Oregon State University, Gilbert Hall 153, Corvallis, Oregon 97331-4003, U.S.A.

|July 1, 1992

Summary

This summary is machine-generated.

This study introduces an automated multielement atomic fluorescence spectrometer for sensitive elemental analysis. The system achieves low detection limits for various elements, enabling efficient trace metal quantification.

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Area of Science:

Analytical Chemistry
Spectroscopy
Instrumental Analysis

Background:

Flame atomic fluorescence (AF) spectrometry is a sensitive technique for elemental analysis.
Automation and multielement capabilities enhance analytical throughput and efficiency.

Purpose of the Study:

To describe an automated multielement flame atomic fluorescence (AF) spectrometer.
To evaluate its performance, including detection limits and critical operational parameters.

Main Methods:

Development of an automated AF spectrometer with a multiple exit slit monochromator and single detector.
Utilized time-multiplex mode for pulsing single-element hollow cathode lamps (HCLs) and gated data acquisition.
Employed a microcomputer for instrument control, sample introduction, and data acquisition.

Main Results:

Achieved single-element detection limits as low as 0.0008 mug/ml (Mg) and 0.003 mug/ml (Cu).
Demonstrated critical dependence of performance on HCL pulse width and peak current optimization.
Reported multielement detection limits that were 2-5 times worse than single-element limits.

Conclusions:

The automated AF spectrometer offers sensitive multielement analysis capabilities.
Optimization of HCL parameters is crucial for achieving optimal detection limits.
Signal-to-noise ratio decreases at higher analyte concentrations due to fluorescence flicker noise.