Optimized Method for Determination 57 Volatile Organic Compounds in Nitrogen Using GC × GC-FID

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Accurate quantification of volatile organic compounds (VOCs) is crucial for environmental monitoring and industrial hygiene.
• Existing analytical methods may lack the necessary resolution and sensitivity for complex VOC mixtures.

Purpose of the Study:

• To develop and validate a robust analytical methodology for the precise determination of 57 VOCs in a nitrogen matrix at a nominal 1 ppmv concentration.
• To enhance the performance of two-dimensional gas chromatography (GC×GC) for VOC analysis.

Main Methods:

• Preparation of a standard gas mixture containing 57 VOCs in nitrogen at 1 ppmv using the weighting method.
• Development and validation of a GC×GC-FID analytical method, employing Deans switches and dual flame ionization detectors.
• Validation parameters included resolution, asymmetry, sensitivity, intra-day and inter-day precision, linearity, LOD, LOQ, and accuracy.

Main Results:

• The GC×GC-FID method demonstrated improved resolution, asymmetry, and sensitivity for the target VOCs.
• Excellent intra-day precision (<1%) and good inter-day precision (0.9–3.0%) were achieved for all 57 compounds.
• The method exhibited high linearity (R² > 0.9995) with low limits of quantification (LOQ: 0.024–0.185 ppmv) and detection (LOD: 0.012–0.092 ppmv).
• Accuracy was confirmed through the analysis of a certified reference material.

Conclusions:

• The developed GC×GC-FID methodology provides a highly sensitive, precise, and accurate approach for quantifying multiple VOCs at ppmv levels.
• This method offers significant improvements over existing techniques for complex VOC mixture analysis.
• The validated method is suitable for reliable determination of VOCs in various applications, including environmental and industrial settings.