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External calibration strategy for trace element quantification in botanical samples by LA-ICP-MS using filter paper.

Matheus A G Nunes1, Mônica Voss1, Gabriela Corazza1

  • 1Department of Chemistry, Federal University of Santa Maria, Av. Roraima, 1000, 97.105-900 Santa Maria, RS, Brazil.

Analytica Chimica Acta
|January 13, 2016
PubMed
Summary

This study introduces filter paper discs with dried solutions as a novel calibration method for elemental analysis in plants using laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS). This approach enhances precision and accuracy for determining multiple elements in botanical samples.

Keywords:
CalibrationInductively coupled plasma-mass spectrometryLaser ablationPlant samples

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Accurate elemental analysis of plant tissues is crucial for environmental monitoring and agricultural science.
  • Traditional methods for laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) calibration can be complex and matrix-dependent.
  • Developing efficient and matrix-matched calibration strategies is essential for reliable plant sample analysis.

Purpose of the Study:

  • To propose and validate a novel external calibration strategy using filter paper discs for plant elemental analysis by LA-ICP-MS.
  • To evaluate the effectiveness of filter paper as a matrix-matched standard for elements like As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr, V, and Zn.
  • To assess the precision, accuracy, and detection limits of the proposed method.

Main Methods:

  • Preparation of solid standards by drying aqueous reference solutions onto filter paper discs.
  • Utilizing (13)C as an internal standard for analyte signal normalization in LA-ICP-MS.
  • Analysis of certified reference materials (CRMs) and plant samples to validate the method's performance.
  • Comparison of results with conventional ICP-MS after microwave-assisted digestion.

Main Results:

  • The filter paper calibration method demonstrated good precision (RSD < 20%) and accuracy when validated against CRMs.
  • The use of (13)C as an internal standard significantly improved the precision of the LA-ICP-MS analysis.
  • Achieved low limits of detection (LOD) ranging from 0.05 to 0.81 μg g(-1) for the analyzed elements.
  • Plant samples analyzed using the proposed method showed good agreement with conventional solution-based ICP-MS analysis.

Conclusions:

  • Filter paper discs with dried aqueous standards offer a practical and effective matrix-matched calibration strategy for LA-ICP-MS analysis of plant samples.
  • This method provides a reliable and improved approach for the multi-element determination of trace elements in botanical matrices.
  • The proposed technique simplifies calibration and enhances the overall analytical performance for environmental and agricultural applications.