Analysis of Dechlorane Plus Residues in Environmental Water Using GCMS-TQ8050 NX with Boosted Efficiency Ion Source(BEIS) and Long-Life Filament

Significance of the Topic

Dechlorane plus is a persistent flame retardant used in polymers with strong bioaccumulation and potential risks to ecosystems and human health. Regulatory bodies including the European Chemicals Agency and the Stockholm Convention have classified it as a substance of very high concern and restricted its use, highlighting the need for sensitive analytical methods to monitor environmental water quality.

Objectives and Study Overview

This study aimed to develop and validate a robust gas chromatography tandem mass spectrometry method for quantifying syn and anti isomers of dechlorane plus in environmental water samples. The approach focused on achieving high sensitivity, reproducibility and long-term operational stability.

Methodology

• Sample Preparation: Liquid-liquid extraction using dichloromethane, repeated thrice, followed by drying over anhydrous sodium sulfate and concentration to 1 mL.
• Cleanup: Silica gel column chromatography with dichloromethane and hexane elution, final concentration to 1 mL.
• Quantitative Analysis: Multiple reaction monitoring mode with 13C-Dechlorane 602 as internal standard to avoid interference from isotopic coelution.

Used Instrumentation

• Shimadzu GCMS-TQ8050 NX triple quadrupole GC-MS with Boost Efficiency Ion Source and long-life filament.
• Capillary column SH-I-1HT (15 m x 0.25 mm x 0.1 µm) and splitless injection at 280 °C.
• Temperature program from 100 °C to 310 °C at 20 °C per minute.
• MRM transitions optimized for syn-DP and anti-DP isomers with collision energies around 18 eV.

Main Results and Discussion

• Linearity: Concentration range 0.2 to 50 ng/mL with correlation coefficients greater than 0.999.
• Limit of Detection: 0.063 ng/mL for syn-DP and 0.103 ng/mL for anti-DP based on ten replicate injections at 0.2 ng/mL.
• Repeatability: Relative standard deviation under 12% for ten injections at 0.5 ng/mL.
• Durability: Over 500 sample injections and 80 standards, peak area ratios remained within ±20% indicating long-term stability.
• Recovery: Spiked surface water samples at 1 ng/mL yielded recoveries around 101% for syn-DP and 102% for anti-DP.

Benefits and Practical Applications

The method delivers high sensitivity, excellent reproducibility and durability, making it suitable for monitoring trace levels of dechlorane plus in surface water, groundwater, industrial effluents and sewage. It supports environmental compliance and pollution control initiatives.

Future Trends and Possibilities

Continuous enhancements may include coupling with automated sample preparation, expanding to other emerging pollutants, integration with high throughput platforms and real-time field deployable systems for on-site monitoring.

Conclusion

The validated GC-MS/MS approach using Shimadzu GCMS-TQ8050 NX with BEIS and long-life filament provides a reliable tool for quantifying dechlorane plus residues in environmental waters. It combines low detection limits, robust performance and streamlined sample treatment, addressing regulatory and research needs.

References

1. Technical guideline HJ168-2020 for development of environmental monitoring analytical methods.