Trace Level Analysis of Epichlorohydrin in Drinking Water by Gas Chromatography/Flame Ionization Detector

Importance of the Topic

Epichlorohydrin is a widely used intermediate in epoxy resin production and can contaminate drinking water through pipe coatings and treatment agents. Due to its toxic profile and strict regulations (EU limit 0.1 µg/L), reliable trace-level analysis is essential.

Objectives and Overview of the Study

The study aimed to develop a rapid, cost-effective, sensitive, and robust GC-FID method for quantifying epichlorohydrin in drinking water at sub-µg/L levels while meeting regulatory requirements.

Methodology

Samples (200 mL) were salted (NaCl), extracted twice with methylene chloride, and the combined organic extracts were concentrated via a Kuderna-Danish evaporator to near dryness. The residue was reconstituted in 1 mL methylene chloride.

Instrumentation Used

• Agilent 7890A gas chromatograph with split/splitless inlet and flame ionization detector
• Agilent J&W DB-5ms Ultra Inert capillary column (10 m×0.18 mm, 0.36 µm film)
• Carrier gas: helium at 1.5 mL/min; inlet: pulsed split; oven program: 30 °C (1 min), ramp 20 °C/min to 100 °C (2 min); FID at 260 °C

Main Results and Discussion

The method achieved linear calibration (0.08–1.60 ng, r² > 0.9997). Detection limit was below 0.07 µg/L. Recoveries at 1 and 5 µg/L spikes averaged 104.7% and 107.0% with RSDs ≤2.21%. Blank drinking water showed no interference.

Benefits and Practical Applications

• Meets EU and EPA requirements for ECH monitoring in water
• Rapid (<2 min retention), sensitive, and reproducible
• Cost-effective sample preparation without expensive headspace or trap systems

Future Trends and Applications

Further enhancements may include coupling with mass spectrometry for confirmatory analysis, automation of extraction and concentration steps, and adaptation to monitor other trace-level epoxide contaminants in environmental and industrial matrices.

Conclusion

A simple GC-FID method using a high-inertness DB-5ms column and K-D concentration enables reliable trace determination of epichlorohydrin in drinking water, combining sensitivity, speed, and robustness for routine laboratory use.

References

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