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Updated: Jul 13, 2026

Capturing Actively Produced Microbial Volatile Organic Compounds from Human-Associated Samples with Vacuum-Assisted Sorbent Extraction
Published on: June 1, 2022
Compound-specific carbon isotope analysis of volatile organic compounds in water using solid-phase microextraction
1Department Cristallografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain. jordi.palau@ub.edu
This study optimized compound-specific isotope analysis for environmental monitoring of groundwater contaminants. Headspace solid-phase microextraction (HS-SPME) offered the highest sensitivity for analyzing chlorinated compounds and aromatics.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Isotope Geochemistry
Background:
- Compound-specific isotope analysis (CSIA) is crucial for tracing organic contaminants in groundwater.
- Solid-phase microextraction (SPME) offers a solvent-free method for sample preparation.
- Optimizing SPME conditions is essential for accurate isotopic analysis of volatile organic compounds (VOCs) at low concentrations.
Purpose of the Study:
- To evaluate and implement a CSIA technique coupled with SPME for analyzing organic compounds in contaminated groundwater.
- To compare direct SPME (D-SPME) and headspace SPME (HS-SPME) for optimizing the analysis of chlorinated methanes, ethenes, toluene, and chlorobenzene.
- To determine carbon isotopic effects during competitive extraction and assess method accuracy and precision.
Main Methods:
- Gas chromatography coupled to isotope ratio mass spectrometry (GC-IRMS) via a combustion interface.
- Carboxen-polydimethylsiloxane fiber SPME, including D-SPME and HS-SPME techniques.
- Analysis of delta(13)C values for chlorinated methanes, ethenes, toluene, and chlorobenzene at microg/L concentrations.
Main Results:
- HS-SPME achieved higher sensitivity compared to D-SPME for VOCs in groundwater.
- Both D-SPME and HS-SPME provided similar precision (<0.5 per thousand) and accuracy for delta(13)C values.
- Measurable, constant deviations in delta(13)C values were observed for certain compounds using HS-SPME, correctable with internal standards.
Conclusions:
- HS-SPME is a sensitive and accurate method for CSIA of VOCs in contaminated groundwater.
- Optimized SPME-CSIA can reliably quantify isotopic compositions of environmental contaminants.
- Standard correction techniques are effective for addressing minor isotopic deviations observed during HS-SPME analysis.
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