GC Analysis of PCBs in Transformer Oil on a 5% Phenyl Column after SPE using Supelclean^™ Sulfoxide

SPE tube/cartridge

Supelclean Sulfoxide SPE Tube, Glass 6 g/20 mL (55252-U)

sample preparation

SPE (Solid Phase Extraction)

column

5% phenyl polysiloxane (Supelco equivalent, SLB-5ms, 28471-U)

sample addition

transformer oil spiked with PCBs

detector

QMS (For full method details, please see reference (1))

extraction process

Sample Pre-treatment: paraffin oil was spiked with a Kanechlor PCB mix at the total levels of 3.7 ppm (mg/kg) and diluted with hexane (1:1 v/v). (Commercial insulation oil (Japan Industrial Standard JIS C2320-1999, insulating oil, Class 1-2/4).)

condition

20 mL acetone; 40 mL of hexane

sample addition

0.4 mL diluted oil sample

elution

12 mL hexane (elutes oil interferences); 25 mL hexane (elutes PCBs)

eluate post-treatment

concentrate under nitrogen