NS30 and Stability Tests Using the New Anatune VOC Analyser

Significance of the Topic

Static headspace GC-MS analysis of volatile organic compounds in water is central to environmental monitoring and regulatory compliance in drinking and wastewater treatment. Automation enhances reproducibility, throughput and data quality.

Objectives and Study Overview

This work evaluates the new Anatune VOC Analyser for NS30 batch testing and a seven-day stability trial across different water hardness levels and spring water. The goal is to demonstrate automated internal standard spiking, calibration linearity and analyte stability.

Methodology and Instrumentation

• Headspace extraction: 15 ml sample with sodium sulfate in 20 ml vial, incubation 17 minutes at elevated temperature, 1 ml headspace injection
• GC-MS analysis: Agilent 7890B GC, 5977 MSD with EI source, DB-624 column (30 m x 0.25 mm x 1.4 µm), run time 9.08 minutes, cycle 14 minutes, SIM and scan modes
• Automation: GERSTEL MPS 2 XL-xt with dual headspace and syringe, 240-position tray, auto-spiking of internal standards and surrogates using Maestro software

Main Results and Discussion

The NS30 procedure passed three batches in soft, medium, hard and surface water achieving R² above 0.995 in six-point calibrations (0.1 to 20 µg/L). Recoveries ranged from 96 to 104 % and relative standard deviations below 3 %. A seven-day stability trial for eight compounds showed concentration changes within ±15 % and CVs below 10 %, confirming sample integrity over time.

Benefits and Practical Applications of the Method

Automated VOC analysis offers consistent spiking, improved throughput with 240-sample capacity and short GC runs, and robust validation in line with NS30 quality control guidelines. It supports routine environmental monitoring in regulatory and QA/QC laboratories.

Future Trends and Potential Applications

Integration with laboratory information management systems, expansion to additional VOC panels and further reduction of analysis time through novel column chemistries will advance high-throughput environmental and industrial VOC monitoring. Coupling headspace automation with alternative detectors may enhance sensitivity for trace-level analysis.

Conclusion

The new Anatune VOC Analyser delivers fully automated HS-GC-MS performance meeting NS30 validation criteria and demonstrates reliable short and mid-term stability of volatile analytes in water matrices.

Reference

• Anatune Ltd Technical Note AS141
• Anatune Application Note AS138