Accurate Single Injection Quantification of Organochlorides Using the Polyarc System

Significance of the topic

Organochlorides are widely used in industrial processes and often found as residuals or impurities. Their accurate quantification is crucial for environmental compliance, product quality control, and laboratory safety. However, traditional GC/FID methods require individual calibrations for each compound due to variable detector responses and rely on potentially hazardous standards.

Objectives and Study Overview

This application demonstrates how coupling a Polyarc® catalytic reactor with GC/FID enables single‐injection quantification of organochlorides without compound‐specific calibration. Three representative sample mixtures were analyzed to validate the methodology against expected concentration ranges.

Methodology

The Polyarc system converts all carbon‐containing analytes to methane before FID detection, yielding an equimolar response per carbon atom. A single reference compound is used to calculate relative molar response factors (RMRFs), which are then applied across all peaks. Samples were injected under controlled split/splitless conditions and a defined oven temperature program.

Instrumentation Used

• Agilent 7890A gas chromatograph with split/splitless inlet
• Polyarc® catalytic microreactor (ARC PA-RRC-A02)
• Capillary‐optimized flame ionization detector
• Agilent 5973 mass spectrometer for simultaneous identification
• High‐purity helium carrier gas, purified air, and hydrogen supply

Main Results and Discussion

Analysis of three samples showed that the calculated concentrations for key organochlorides (e.g., trichloroethylene, tetrachloroethylene) fell within their expected ppm ranges. The uniform methane response eliminated the need for individual calibration curves, streamlined data processing, and delivered consistent quantitation across injections.

Benefits and Practical Applications

• Significant time savings by removing compound‐specific calibrations
• Reduced handling and storage of toxic calibration standards
• Improved laboratory safety and throughput
• Broad applicability in environmental monitoring, industrial QA/QC, and research

Future Trends and Possibilities

Extending this approach to a wider range of halogenated and complex organic matrices can further broaden its utility. Integration with automated sampling systems and development of shared RMRF libraries could facilitate real‐time monitoring and standardized workflows.

Conclusion

The Polyarc® system provides a robust, efficient solution for organochloride quantification by delivering a universal equimolar response in GC/FID, eliminating extensive calibration steps, and enhancing laboratory safety.

References

• Saunders T. Accurate Single Injection Quantification of Organochlorides Using the Polyarc System. Activated Research Company Application Note PA-APP-1813, June 8, 2018.