In weakly alkaline medium copper(II) ions react with cuprizone forming a blue colour complex.

In water copper(II) can be found in dissolved as well as in undissolved form. Copper(I) compounds and undissolved copper(II) compounds are not determined unless they are decomposed with concentrated nitric acid prior to the test.

In weakly alkaline medium copper(II) ions react with cuprizone forming a blue colour complex.

In water copper(II) can be found in dissolved as well as in undissolved form. Copper(I) compounds and undissolved copper(II) compounds are not determined unless they are decomposed with concentrated nitric acid prior to the test.

In weakly alkaline medium copper(II) ions react with cuprizone forming a blue colour complex.

In water copper(II) can be found in dissolved as well as in undissolved form. Copper(I) compounds and undissolved copper(II) compounds are not determined unless they are decomposed with concentrated nitric acid prior to the test.