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Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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An optimized method for PFAS analysis using HR-CS-GFMAS via GaF detection.

Fabian Simon1, Marcus von der Au1, Lennart Gehrenkemper1

  • 1Federal Institute for Materials Research and Testing, Division 1.1 - Inorganic Trace Analysis, Richard-Willstätter-Straße 11, 12489, Berlin, Germany.

Talanta
|September 6, 2024
PubMed
Summary

Optimizing the HR-CS-GFMAS method for per- and polyfluoroalkyl substances (PFAS) analysis improves accuracy. A modifier drying pre-treatment enhances sensitivity for volatile PFAS, reducing errors in extractable organic fluorine measurements.

Keywords:
Extractable organic fluorine (EOF)FluorineHigh resolution-continuum source-graphite furnace molecular absorption spectrometry (HR–CS–GFMAS)Method optimizationPer- and polyfluoroalkyl substances (PFAS)Response factors

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Per- and polyfluoroalkyl substances (PFAS) analysis using extractable organic fluorine (EOF) and high resolution-continuum source-graphite furnace molecular absorption spectrometry (HR-CS-GFMAS) offers high sensitivity and selectivity.
  • Current HR-CS-GFMAS methods suffer from volatile PFAS losses during drying and heating, leading to inaccurate discrimination and reduced accuracy in EOF determination.

Purpose of the Study:

  • To optimize the HR-CS-GFMAS method for more accurate PFAS analysis.
  • To improve the sensitivity and reduce the variability of fluorine response factors for various PFAS.
  • To address the limitations of existing methods for realistic PFAS pollution assessment.

Main Methods:

  • Systematic determination of fluorine response factors for diverse PFAS.
  • Implementation of a modifier drying pre-treatment step.
  • Sequential injection of sample solutions with optimized drying and heating protocols.
  • Investigation of matrix effects in water samples, including chloride interference.

Main Results:

  • Optimization significantly improved sensitivity for volatile PFAS, particularly with magnesium (Mg) modifier addition during drying.
  • Relative standard deviation of fluorine response factors decreased from 55% to 27%.
  • Instrumental limits of detection (LOD) and quantification (LOQ) for fluorine were determined as 1.71 μg/L and 5.13 μg/L, respectively.
  • Substance-specific matrix effects were observed, with perfluorooctanoic acid (PFOA) showing signal suppression at high chloride concentrations.

Conclusions:

  • The optimized HR-CS-GFMAS method provides more accurate organofluorine sum parameter analysis.
  • Modifier-assisted drying is crucial for enhancing the detection of volatile PFAS.
  • Effective sample preparation to remove interfering substances like chloride is necessary for reliable PFAS quantification.