Simultaneous Analysis of Synthetic Musk Compounds in Water Using a Triple Quadrupole GC-MS System

Importance of Monitoring Synthetic Musk Compounds in Water

Synthetic musk compounds are widely used in consumer products and often enter aquatic environments through wastewater. Their persistence and bioaccumulation pose risks of endocrine disruption and toxicity to aquatic organisms and humans. Regular monitoring ensures water safety and informs risk assessment and regulatory strategies.

Study Objectives and Overview

This study demonstrates a simultaneous quantification method for 15 synthetic musk compounds in water samples. It employs liquid–liquid extraction with n-hexane/dichloromethane followed by gas chromatography–tandem mass spectrometry using the Shimadzu GCMS-TQ 8050 NX system. The aim is to achieve high sensitivity, accuracy, and throughput for environmental monitoring.

Methodology and Instrumentation

• Sample preparation: Liquid–liquid extraction of 100 mL water samples with solvent A (n-hexane/dichloromethane, 1:1), repeated twice, evaporation under nitrogen, and reconstitution with solvent A plus phenanthrene-d10 internal standard.
• Instrumentation: Shimadzu Nexis GC-2030 gas chromatograph coupled to TQ 8050 NX triple quadrupole mass spectrometer.
• GC conditions: SH-Rxi-5MS column (30 m × 0.25 mm ID, 0.25 μm); splitless injection at 280 °C; helium carrier with linear velocity control; temperature program from 60 °C to 280 °C at defined ramps.
• MS/MS settings: Electron ionization at 70 eV; ion source 250 °C; interface 300 °C; multiple reaction monitoring transitions optimized for each analyte.

Main Results and Discussion

Calibration curves for all 15 musk compounds showed coefficients of determination above 0.996 over 0.1–5.0 ng/mL. Method detection limits ranged from 0.003 to 0.020 ng/mL and quantitation limits from 0.01 to 0.07 ng/mL. Recovery tests at 0.2 ng/mL yielded recoveries between 86.3% and 106.4% with relative standard deviations below 4.2%. Chromatographic separation achieved clear peak resolution within a 14–22 min runtime.

Practical Benefits and Applications

• Trace-level detection supports regulatory compliance and environmental risk assessment.
• Simultaneous analysis of multiple analytes increases laboratory throughput.
• LLE sample preparation is simple and effective for a broad range of organic compounds.
• MRM-based quantification ensures selectivity in complex water matrices.

Future Trends and Potential Applications

Automation of sample preparation and integration of online extraction could further streamline workflows. Expansion to high-resolution mass spectrometry may allow screening of unknown contaminants. Advances in chemometrics and machine learning can enhance data interpretation and method robustness.

Conclusion

The described GC-MS/MS method on the Shimadzu GCMS-TQ 8050 NX delivers reliable, sensitive, and efficient quantification of 15 synthetic musk compounds in water. Its performance metrics meet the demands of routine environmental monitoring and risk assessment.

Reference

1. Removal Characteristics of Synthetic Musk Compounds in Water by Ozone Treatment: Journal of KSEE Vol.34, No.2, February 2012
2. Analysis of Synthetic Fragrances in Water Using Stir Bar Sorptive Extraction and GC-MS/MS: Journal of Korean Society of Environment Engineers Vol.36, No.6, June 2014
3. Behavior of Synthetic Musk Fragrances in Freshwaters: Occurrence, Relations with Environmental Parameters, and Preliminary Risk Assessment: Environmental Science and Pollution Research Vol.30, September 2023
4. Nakdong River Environment Research Center, National Institute of Environmental Research: Journal of KSEE Vol.33, No.11, November 2011