This document describes an automated clean-up method for PCB extracts from waste oil using the Agilent 7696A Sample Prep WorkBench. The clean-up process, which involves GC-ECD or GC-MS analysis and purification using silica or acidified silica, effectively removes interfering substances and allows for accurate determination of PCBs in waste oil.
The document details an automated sample preparation procedure for determining polychlorinated biphenyls (PCBs) in waste mineral oils. It describes a two-step dispersive solid phase extraction (d-SPE) process using acidified silica/SAX adsorbent followed by washed silica to remove polar interferences and matrix compounds.
The system automates a miniaturized dispersive solid phase extraction method to purify extracts of polychlorinated biphenyls (PCBs) from waste oils by removing polar interferences.
The system mixes the vials at 4,000 RPM for 5 min 0 sec and waits for 2 min 0 sec between steps to allow polar fractions to bind.