Use of hypercrosslinked polystyrene for the determination of pyrocatechol,resorcinol, and hydroquinone by reversed-phase HPLC with dynamic on-line preconcentration

Adsorption isotherms of pyrocatechol, resorcinol, and hydroquinone on hyper crosslinked polystyrene MN-200 are described by the Langmuir equation; dist ribution coefficients of these compounds are 1500, 550, and 370 mL/g, respe ctively; breakthrough capacities are 15.3, 11.2, and 11.3 mg/g, respectivel y. The comparison of hypercrosslinked polystyrene with other sorbents in th e efficiency of the dynamic preconcentration of hydroxyphenols demonstrated its advantages. A procedure is proposed for the determination of pyrocatec hol, resorcinol, and hydroquinone in water by high-performance liquid chrom atography with dynamic on-line preconcentration on a concentrating column i nstead of the injector loop, which provides the determination of these comp ounds at concentrations down to 2-3 mug/L. The accuracy of the procedure wa s verified by the added-found method with a water sample.