Determination of phenolic flame-retardants in human plasma using solid-phase extraction and gas chromatography-electron-capture mass spectrometry

A method for determination of phenolic flame-retardants in human plasma uti lizing solid-phase extraction (SPE) and gas chromatography with electron-ca pture mass spectrometric detection (GC-ECMS), has been developed. The plasm a lipids were decomposed by application of concentrated sulphuric acid dire ctly on the polystyrene-divinylbenzene SPE column. The method has been vali dated for 2,4,6-tribromophenol (TriBP), pentabromophenol (PeBP), tetrachlor obisphenol-A (TCBP-A) and tetrabromobisphenol-A (TBBP-A) in the concentrati on range 1.2-25, 0.4-40, 4-200 and 4-200 pg g(-1) plasma, respectively. The average absolute recovery of the analytes ranged from 51 to 85%. Tetrabrom o-o-cresol and chlorotribromobisphenol-A were found suitable as internal st andards, and the average recovery of the analytes relative to the internal standards was in the range 93-107%. The repeatability of the method was in the range 4-30% relative standard deviation. The estimated detection limits of TriBP, PeBP, TCBP-A and TBBP-A were 0.3, 0.4, 3.0 and 0.8 pg g(-1) plas ma, respectively. The method has been used for analysis of plasma samples f rom potentially occupationally exposed human individuals. (C) 2001 Elsevier Science B.V. All rights reserved.