The analytical eff ect of micelles of cationic surfactants in the reactions of some aromatic aldehydes (AA) with 2,4-dinitrophenylhydrazine (DNPH) with the formation of the corresponding aci-forms of hydrazones has been established. It has been established that micelles of nonionic and anionic surfactants do not cause analytically signifi cant eff ects in the system under study.
