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A simple calibration procedure for volatile organic compounds sampling in air with adsorptive solid-phase
Ludovic Tuduri1, Valérie Desauziers, Jean Louis Fanlo
1Laboratoire Génie de l'Environnement Industriel, Ecole des Mines d'Alès, Hélioparc- 2, avenue Pierre Angot, 64053 Pau cedex, France.
The Analyst
|September 11, 2003
Summary
This study introduces a simplified calibration method for air sampling using polydimethylsiloxane/carboxen (PDMS/CAR) solid-phase microextraction (SPME) fibers. The new approach allows for a single calibration curve across various sampling times, enhancing the efficiency of volatile organic compound (VOC) analysis.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Solid-phase microextraction (SPME) is a widely used technique for sampling volatile organic compounds (VOCs) in air.
- Current methods often require extensive calibration procedures, limiting efficiency.
Purpose of the Study:
- To develop and validate a simplified air sampling strategy using polydimethylsiloxane/carboxen (PDMS/CAR) SPME fibers.
- To establish a single calibration curve applicable across different extraction times under constant conditions.
Main Methods:
- Utilized PDMS/CAR SPME fibers for air sampling.
- Modeled sampling using Fick's law of diffusion.
- Determined experimental sampling rates via Gas Chromatography-Flame Ionization Detection (GC-FID) in static and dynamic modes.
- Investigated calibration curve linearity and deviation points.
Main Results:
- Established experimental sampling rates for acetone, 1,2-dichloroethane, toluene, and butyl acetate in both static and dynamic modes.
- Quantified the limits of linearity (adsorption site saturation) for each compound.
- Validated sampling rates in a complex gaseous mixture, noting earlier deviation from linearity due to competitive adsorption.
Conclusions:
- The proposed SPME air sampling strategy simplifies calibration, making the technique more efficient.
- Careful selection of sampling times is crucial in complex mixtures to prevent competitive adsorption and ensure accurate quantitative analysis.