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High Throughput, Direct Determination of 226Ra in Water and Digested Geological Samples.

F M Wærsted1, K A Jensen1, E Reinoso-Maset1

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A new direct measurement method for radium-226 (226Ra) in water and geological samples using ICP-QQQ was developed. This method offers high throughput and low sample input, meeting regulatory standards for drinking water analysis.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Radiochemistry

Background:

  • Accurate measurement of radium-226 (226Ra) is crucial for environmental monitoring and regulatory compliance.
  • Existing methods for 226Ra analysis can be labor-intensive and time-consuming, requiring extensive sample preparation.

Purpose of the Study:

  • To develop a direct, rapid, and efficient method for measuring 226Ra in water and geological samples.
  • To achieve detection limits compliant with drinking water quality regulations.

Main Methods:

  • Direct measurement of 226Ra using triple quadrupole inductively coupled plasma mass spectrometry (ICP-QQQ).
  • Utilized N2O as a reaction gas to eliminate the need for pre-analysis separation.
  • Applied acid digestion (HNO3 + H3PO4) for soil and rock samples.

Main Results:

  • Achieved a limit of detection of 0.42 pg L-1 for 226Ra in water, meeting regulatory standards.
  • Successfully analyzed high total dissolved solids water samples with a simple dilution.
  • Established a limit of detection of 0.75 ng kg-1 for geological samples.
  • Demonstrated high sample throughput with 2-minute analysis time per water sample.

Conclusions:

  • The developed direct ICP-QQQ method is highly efficient for 226Ra determination in various matrices.
  • Offers significant advantages in terms of speed, labor, sample input, and throughput compared to traditional methods.
  • Provides a valuable tool for environmental monitoring, emergency preparedness, and environmental modeling data collection.