How is transformer oil tested for PCB contamination?

Transformer oil is tested for PCB contamination by collecting representative oil samples and analyzing them in certified laboratories. Gas chromatography with electron capture detection is commonly used to identify and quantify PCB concentrations. Results are compared against regulatory thresholds to classify the oil as PCB-free, low-level contaminated, or PCB-containing. Accurate testing is critical for safe handling, disposal decisions, and regulatory compliance during maintenance or decommissioning.