Analysis of 1,2,3-Benzotriazole in Insulating Oil

Importance of the Topic

Analysis of benzotriazole in insulating oil is crucial for ensuring the long term reliability of electrical equipment. Benzotriazole functions as a corrosion inhibitor in metal parts and its concentration affects both performance and chemical stability of insulating fluids.

Objective and Study Overview

This application note describes a rapid and robust HPLC method for determining 1,2,3-benzotriazole in transformer oil. The focus is on simple sample preparation and reliable quantification using reversed phase chromatography.

Methodology and Instrumentation

• Instrument system Prominence-i
• Column Shim-pack VP-ODS 150 mm L × 4.6 mm I D, 5 μm
• Mobile phase water / methanol ratio 6 / 4 by volume
• Flow rate 1.0 mL per minute
• Column temperature 40 degree C
• Injection volume 5 μL
• Detection UV at 270 nm

Sample pretreatment involves dilution of insulating oil with the mobile phase mixture followed by filtration to remove particulates prior to injection.

Main Results and Discussion

The method provides a clear peak for benzotriazole with baseline separation from major oil matrix components. Calibration over a typical working range yields excellent linearity and reproducibility. UV detection at 270 nm offers sufficient sensitivity for routine analysis in quality control laboratories.

Benefits and Practical Applications

• Minimal sample preparation without laborious extraction steps
• Short analysis time compatible with high throughput demands
• Reliable quantification for transformer maintenance and oil condition monitoring
• Applicable to preventive diagnostics and regulatory compliance

Future Trends and Potential Applications

Integration of this method with automated sample handling and coupling with mass spectrometry could further improve sensitivity and specificity. Emerging green solvents and microflow techniques may reduce solvent consumption and enhance method sustainability.

Conclusion

The described HPLC protocol enables fast and accurate determination of benzotriazole in insulating oil. Its simplicity and robustness make it suitable for routine quality assurance and equipment life cycle management.

Reference

• Application News L511 JP ENG Shimadzu Corporation First Edition Dec 2021 ERAS-1000-0114