SORPTION-PHOTOMETRIC DETERMINATION OF PHENOLS WITH POLYURETHANE FOAMS

The dependence of sorption of 4-nitrophenylazoderivatives of phenols a nd naphthols by polyurethane foams (PUF) (on the basis of ethers and e sters) has been studied as the function of PUF type, 4-nitropbcnyldiaz onium tetrafluoroborate concentration, nature and concentration of cou nter cations and analyzed sample volume. It has been shown that sorpti on increases in the presence of salts of alkali metals and cationic su rfactants. Some estimation of sorption mechanism has been made. Sorpti on-photometric method for the determination of aromatic hydroxycompoun ds has been developed. It is characterized by low detection limit.