NEW CATION-EXCHANGE RESINS WITH HIGH REVERSED-PHASE CHARACTER FOR SOLID-PHASE EXTRACTION OF PHENOLS

High capacity carboxylic acid functionalized resins, prepared by ring- opening metathesis polymerization, were used for solid-phase extractio n (SPE) of phenols. Two resins, based on cross-linked poly-(endo,endo- norborn-2-ene-5,6-dicarboxylic acid) exhibited a capacity of 3.5 and 5 .1 mequiv. COOH/g, respectively. Particle-loaded PTFE membranes were p repared from a 3.1 mequiv. COOH/g resin. The extraction behavior of th e new materials versus two different EPA priority pollutant phenol sta ndards was investigated. For most compounds, a quantitative recovery w as observed. The extraction efficiency of the new resins was compared to those of other, commercially available materials such as silica C-1 8 or carboxypropylsilica. The general advantages of the new materials, the mechanism of extraction, the influence of polarity and acidity of the compounds investigated as well as differences between membranes a nd columns containing the new particles are discussed. Finally, the ex traction efficiency of the new resins for phenols from spiked soil sam ples using both standard SPE as well as batch-techniques was investiga ted. (C) 1998 Elsevier Science B.V. All rights reserved.