High Performance Liquid Chromatographic Determination of Aromatic Triazole Corrosion Inhibitors in Aqueous Solutions

A liquid chromatographic procedure has been developed for the separation and quantitation of two commercially available aromatic triazole compounds, benzotriazole and tolyltriazole. These compounds are used as copper corrosion inhibitors. The analysis was performed using 25 cm × 4.6 mm Zorbax CN-850 column and an eluant composed of water and acetonitrile in a ratio of 90:10. A variable UV detector at a fixed 275 nm wavelength was used to detect the compounds. This procedure was applicable for the determination of benzotriazole and tolyltriazole, separately or in admixture, at a detection limit of 1 mg/liter. The chromatographic conditions employed also resolved tolyltriazole into its two commercially occurring isomers.