This method is intended for the determination of oxine-copper (AWPA P8) in treating solutions and treated wood samples, when a method that is specific for oxine (8-hydroxyquinoline) is required. This method will differentiate oxine-copper (Cu8HQ: also called copper-8-hydroxyquinoline or copper-8- quinolinolate) from other copper-containing biocides. An alternative method for the quantitation of this bio-cide is the determination of total copper by atomic ab-sorption spectroscopy.

This potentiometric titrafion monitors the bromine substitution reaction in the 5, 7 positions on the oxine moiety of copper-8-hydroxyquinoline in aqueous acid solution, with potassium bromate-potassium bromide titrant. Although there may be other brominatable species in the wood extracts that contribute to a high blank, they are effectively subtracted out by running standard additions standard curve.