Solid phase extraction of chlorinated phenolics in aqueous solution

Abstract

The method which will be described is based on a pre‐concentration of chlorinated phenolic water contaminations in a solid sorbent. These compounds were eluted, derivatized, extracted, and determined by gas chromatography using a nonpolar capillary column. The determination of 29 chlorinated phenols, guaiacols, catechols, syringols, and vanillins in aqueous standard solution was carried out by absorption on a XAD‐4 polystyrene resin (solid phase extraction), followed by elution with methanol and diethyl ether. All the extracts obtained were analyzed by a GC/ECD and by a GC/MS. Gas chromatography interfaced with an Electron Capture Detector (GC/ECD) was performed in a VARIAN‐3400 instrument. Mass spectral abundance data for the characteristic ions of the acetyl derivatives—obtained by GC/MS/HP 5988A (Electron Impact Model)—was used to confirm the identity of the chlorinated phenols. © 1996 John Wiley & Sons, Inc.

Oxidation of catechols during positive ion electrospray mass spectrometric analysis: Evidence for in‐source oxidative dimerization

“…Catechols are an important class of analytes occurring in many natural and synthetic products . They are prone to oxidative reactions leading to in many cases the formation of quinones .…”