Determination of N-cyclohexyl-diazeniumdioxide (HDO) containing compounds in treated wood using GC-MS

Significance of the Topic

The reliable analysis of organic wood preservative compounds in solid matrices is critical for environmental risk assessment and regulatory compliance under biocidal directives. Traditional extraction-based approaches are time-consuming and may introduce interferences from wood constituents. A direct thermal desorption GC-MS method provides a rapid and sensitive solution for detecting N-cyclohexyl-diazeniumdioxide in treated timber.

Objectives and Study Overview

This work aims to develop and validate a thermal desorption GC-MS procedure for identification and quantification of HDO in impregnated wood. Key objectives include optimization of desorption conditions, demonstration of method reproducibility across various formulations, and determination of practical detection limits.

Methodology and Instrumentation

Wood specimens are milled to a uniform particle size (≤3 mm) and weighed (≈15–20 mg) into thermal desorption vials. Samples are rapidly heated to 200 °C within the GC oven, releasing volatile analytes directly onto a capillary column. Separation is achieved under a controlled temperature program, and HDO is identified by characteristic retention time (~3.48 min) and mass spectral fragmentation (m/z range 35–150). Instrumentation includes an ATAS autosampler, thermal desorber unit, Finnigan GC system, and Finnigan mass spectrometer.

Main Results and Discussion

A distinct chromatographic peak corresponding to HDO was observed in both K-HDO and Cu-HDO treated samples, with mass spectra confirming expected fragment patterns. Untreated wood produced background peaks but without spectral match to HDO. Signal intensity showed a linear relationship with initial HDO concentration, supporting quantitative capability. The estimated detection limit for HDO in wood is approximately 50 ppm.

Benefits and Practical Applications

• Minimal sample preparation without solvent extraction
• Rapid analysis with direct thermal desorption in the GC oven
• High selectivity and sensitivity via mass spectral confirmation
• Suitable for routine quality control of wood preservative treatments

Future Trends and Possibilities for Application

Further research may expand this approach to diverse wood species and additional organic biocides. Calibration strategies will enhance quantitative accuracy. Adapting thermal desorption GC-MS to composite materials, coatings, and other environmental matrices could extend its utility.

Conclusion

The developed thermal desorption GC-MS method offers a fast, reliable, and direct technique for detecting HDO in treated wood with minimal interference. Its quantitative potential and low detection limits make it a valuable tool for regulatory compliance and industrial quality assurance.

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