US EPA Method 8260 with the Teledyne Tekmar Atomx XYZ and the Thermo Scientific™ TRACE™ 1310 GC and ISQ™ 7000 MS with Advanced Electron Ionization (AEI) Source

Significance of the topic

Determination of volatile organic compounds (VOCs) in environmental samples is essential for assessing pollution, protecting public health, and meeting regulatory standards. US EPA Method 8260 combined with Methods 5030/5035 represents a widely accepted protocol for trace-level analysis of VOCs in water and soil.

Objectives and study overview

This application note evaluates the performance of a Teledyne Tekmar Atomx XYZ purge and trap system coupled to a Thermo Scientific TRACE 1310 GC and ISQ 7000 MS with an Advanced Electron Ionization (AEI) source. Key goals include constructing linear calibration curves, determining method detection limits (MDLs), and assessing precision and accuracy across 97 target VOCs in water and soil matrices.

Methodology and sample preparation

Calibration standards were prepared in methanol at 50 ppm and diluted to cover 0.5–200 ppb for water and 1–200 ppb for soil. Internal standards (pentafluorobenzene, 1,4-difluorobenzene, chlorobenzene-d5, 1,4-dichlorobenzene-d4) and surrogates (dibromofluoromethane, 1,2-dichloroethane-d4, toluene-d8, 4-bromofluorobenzene) were added at 25 ppb. Ten replicates at the low end of the calibration range were used for MDL, accuracy, and precision assessment. Atomx XYZ parameters were optimized separately for aqueous and soil methods, while GC and MS conditions employed an Rtx-VMS column and scan range of 35–260 amu.

Used instrumentation

• Teledyne Tekmar Atomx XYZ purge and trap system
• Thermo Scientific TRACE 1310 gas chromatograph
• Thermo Scientific ISQ 7000 mass spectrometer with AEI source

Main results and discussion

Calibration curves for all compounds exhibited coefficients of variation (%RSD) below 20%, meeting EPA requirements. MDLs ranged from sub-ppb to low-ppb levels. Accuracy fell within 70–130% and precision yielded %RSD values below 20% for both water and soil methods. Total ion chromatograms of 100 ppb standards demonstrated consistent peak shapes with minimal water interference and baseline stability, reflecting an efficient moisture control system.

Benefits and practical applications

The Atomx XYZ offers a 14 % reduction in cycle time compared to previous models, an 84-position autosampler, and improved water vapor removal by up to 60 %, extending column life. Its compact footprint and robust design support high-throughput environmental laboratories handling a variety of matrices.

Future trends and potential applications

Ongoing developments may include further automation, integration with high-resolution mass spectrometry, and adaptation of the AEI source for even lower detection limits. Expansion to other challenging matrices and real-time monitoring applications could enhance environmental compliance and process control.

Conclusion

This study confirms that the combination of the Teledyne Tekmar Atomx XYZ purge and trap system with the Thermo Scientific TRACE 1310 GC/ISQ 7000 MS and AEI source reliably meets US EPA Method 8260 requirements for VOC analysis in water and soil, delivering robust performance, low MDLs, and high sample throughput.

References

• US EPA SW-846 Method 8260C, Revision 3 (2006). Volatile Organic Compounds by GC/MS.
• US EPA SW-846 Method 8260D, Revision 4 (2017). Volatile Organic Compounds by GC/MS.
• US EPA SW-846 Method 5030B, Revision 2 (1996). Purge and Trap for Aqueous Samples.
• US EPA SW-846 Method 5030C, Revision 3 (2003). Purge and Trap for Aqueous Samples.