Meeting the European Commission Performance Criteria for the Use of Triple Quadrupole GC-MS/MS as a Confirmatory Method for PCDD/Fs in Food and Feed Samples

Importance of the topic

Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) are persistent organic contaminants with proven toxic and carcinogenic effects in humans.
They accumulate in the food chain, making accurate measurement in food and feed vital for public health and regulatory compliance.

Aims and overview

This study assessed the suitability of a triple quadrupole GC-MS/MS system as a confirmatory method for PCDD/F analysis in food and feed.
Performance was evaluated against new European Commission confirmation criteria and benchmarked against traditional high resolution mass spectrometry (GC-HRMS).

Methodology

Standards containing native and 13C-labeled congeners were used to prepare calibration curves and quality control solutions.
Matrix samples comprised fish, feed, and milk powders cleaned by automated SPE or multilayer silica/alumina followed by activated carbon.
Performance parameters included unit mass resolution in each quadrupole, two SRM transitions per analyte, and ion intensity tolerances of ±15%.

Instrumentation

Analysis employed a Thermo Scientific TSQ 8000 Evo triple quadrupole coupled to a TRACE 1310 gas chromatograph.
Injection used a TriPlus RSH autosampler and TraceGOLD TG-5SilMS column (60 m × 0.25 mm ID × 0.25 μm film).
MS/MS detection featured electron ionization at 40 eV, unit mass widths (0.7 Da), argon collision gas at 60 psi, and timed SRM acquisition.
Data processing and quantification were handled by TargetQuan 3.1 software with isotope dilution and TEQ calculation modules.

Main results and discussion

Chromatography achieved >5 % valley separation for critical isomer pairs and overall baseline resolution within regulatory requirements.
Timed SRM enhanced sensitivity compared with segmented SRM, enabling limits of quantification between 0.01–0.05 pg/μL.
Calibration linearity showed response factor RSDs under 3.6 % across six-point curves.
Repeatability tests yielded peak area RSDs below 9 % for all congeners, and ion ratio deviations remained within the ±15 % threshold.
Quantified TEQ values in fish, feed, and milk powders matched GC-HRMS results with deviations under 5 % and z-scores within ±2 for interlaboratory samples.

Benefits and practical applications

Triple quadrupole GC-MS/MS offers a cost-effective, high-throughput alternative to GC-HRMS for routine dioxin confirmation.
The system meets stringent EU criteria, supports regulatory monitoring, and reduces instrument time without sacrificing sensitivity or selectivity.

Future trends and possibilities

Further advancements may include streamlined sample preparation automation, expanded compound libraries for suspect screening, and integration with high resolution workflows.
Emerging ionization techniques and miniature MS platforms could enable on-site testing and real-time monitoring of persistent pollutants.

Conclusion

The TSQ 8000 Evo GC-MS/MS system demonstrated full compliance with EU confirmatory requirements for PCDD/Fs in food and feed.
Key performance indicators—sensitivity, resolution, linearity, repeatability, and ion ratio accuracy—matched those of GC-HRMS, validating its use in routine analytical laboratories.

References

1. European Commission, Commission Regulation No 1883, Off J Eur Union L 364, 32–43, 2006
2. European Commission, Commission Regulation No 1259, Off J Eur Union L 320, 18–23, 2011
3. European Commission, Commission Regulation No 252, Off J Eur Union L 84, 1–22, 2012
4. European Commission, Commission Regulation No 589, Off J Eur Union L 164, 18–40, 2014
5. Kotz A et al, Organohalogen Compounds Vol 74, 156–159, 2012
6. US EPA Method 1613B, Isotope dilution HRGC/HRMS for chlorinated dioxins and furans, 1994