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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Cavity Ring-Down Spectroscopy Performance and Procedures for High-Throughput δ18O and δ2H Measurement in Water Using

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Cavity ring-down spectroscopy (CRDS) provides precise hydrogen (δ²H) and oxygen (δ¹⁸O) water isotope measurements. A one-year study confirmed its reliability for high-throughput analysis, achieving accuracy vital for environmental research.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Analytical Chemistry

Background:

  • Cavity ring-down spectroscopy (CRDS) is increasingly used for water isotope analysis (δ²H and δ¹⁸O).
  • Long-term performance data for high-throughput CRDS are limited.
  • Ensuring accuracy and precision is crucial for diverse scientific applications.

Purpose of the Study:

  • To evaluate the one-year performance of CRDS for δ²H and δ¹⁸O measurements.
  • To detail a methodological and calibration strategy for reliable, high-throughput CRDS analysis.
  • To assess CRDS accuracy and precision using USGS reference materials.

Main Methods:

  • Utilized Picarro's
  • Express
  • mode for continuous, high-throughput water isotope analysis.
  • Implemented a comprehensive methodological and calibration strategy.
  • Analyzed United States Geological Survey (USGS) reference materials as unknowns over one year.

Main Results:

  • Achieved long-term precision better than ±0.5‰ for δ¹⁸O and ±1.0‰ for δ²H (±1σ).
  • Demonstrated CRDS reliability for high-throughput analysis (~200 samples/week).
  • Identified and addressed challenges including memory and matrix effects.

Conclusions:

  • CRDS offers a reliable method for high-throughput δ²H and δ¹⁸O analysis in water.
  • A robust methodological and calibration strategy ensures long-term accuracy and precision.
  • This framework supports CRDS applications in hydrology, paleoclimatology, and biogeochemistry.