Extraction preconcentration with trioctylamine and trioctylphosphine oxides in the determination of dihydroxybenzenes

摘要

Some regularities in the extraction of dihydroxybenzenes with toluene solutions of organic oxides are studied. In the complexation of dihydroxybenzenes with trioctylphosphine and trioctylamine oxides, it is found that pyrocatechol and resorcinol are extracted from aqueous solutions as 1:1 complexes, whereas hydroquinone forms 1:2 complexes. Extraction and stability constants of complexes are calculated. A procedure is developed for the determination of dihydroxybenzenes using extraction preconcentration by toluene solutions of trioctylphosphine and trioctylamine oxides.