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Optimization of liquid jet system for laser-induced breakdown spectroscopy analysis.

Katarína Skočovská1, Jan Novotný2, David Prochazka2

  • 1Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic.

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Summary

Optimizing a jet system for Laser-Induced Breakdown Spectroscopy (LIBS) improved liquid sample analysis. Double-pulse LIBS achieved a 40% lower limit of detection for copper compared to single-pulse.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Direct elemental analysis of liquids using Laser-Induced Breakdown Spectroscopy (LIBS) requires precise control over sample delivery and laser-matter interaction.
  • Optimizing geometrical and temporal parameters is crucial for enhancing the sensitivity and repeatability of LIBS measurements.

Purpose of the Study:

  • To optimize geometrical and temporal parameters of a jet system for direct elemental analysis of liquid samples using LIBS.
  • To compare the sensitivity of single-pulse (SP) and double-pulse (DP) LIBS for detecting heavy metals in aqueous solutions.

Main Methods:

  • Synchronization of a peristaltic pump with the ablation laser flashlamp to stabilize ablated sample volume and laser angle.
  • Optimization of laser energy, focusing lens distance, gate delay, gate width, and inter-pulse delay for SP and DP LIBS.
  • Estimation of limits of detection (LODs) for copper and lead in aqueous solutions.

Main Results:

  • Synchronization reduced signal standard deviations, enhancing measurement repeatability.
  • Optimized parameters led to higher signal-to-noise ratios and lower relative standard deviations.
  • Double-pulse LIBS demonstrated improved sensitivity, with a 40% lower LOD for copper compared to single-pulse LIBS.

Conclusions:

  • The optimized jet system significantly enhances the direct elemental analysis of liquid samples using LIBS.
  • Double-pulse LIBS offers superior sensitivity for detecting heavy metal traces in aqueous solutions compared to single-pulse LIBS.