Conlometric determination of weak bases applying bismuth electrode pair for the end-point detection

The alkaline hydrolysis of these vinyl phosphates gives dimethylphosphoric acid and the corresponding N-methylated acetoacetamide which is titrated with sodium nitrite. The polarovoltry (constant current potentiometry) is well appropriate for end point detection. Free acetoacetamides are determined in the same way in non-hydrolized samples and taken into account.