CHEMICALLY-MODIFIED POLYMERIC RESIN USED AS SORBENT IN A SOLID-PHASE EXTRACTION PROCESS TO DETERMINE PHENOLIC-COMPOUNDS IN WATER

A chemically modified polymeric resin with an acetyl group is develope d for use in a solid-phase extraction process. The breakthrough volume s and selectivity of several phenolic compounds were studied and compa red with the ones obtained for several commercial sorbents such as PLR P-s, Amberchrom, Envi-Chrom P and LiChrolut EN. The study was carried out by coupling an on-line solid-phase extraction system to a modified liquid chromatograph where compounds were eluted only by the organic solvent of the mobile phase. The sorbent studied was used to establish a method for determining eleven Environmental Protection Agency prior ity phenolic compounds in water at low levels.