The following case studies illustrate the performance using Sitelab’s UVF-3100C analyzer for testing Polychlorinated Biphenyls (PCBs).  The analyzer is fitted with optical filters sensitive to the PCB Aroclors of interest.  However, since PCBs are often found in transformer oils or waste oils, which may co-fluoresce at the PCB wavelength, the potential interference of the non-PCB compounds is minimized by calibrating the analyzer using the PCB concentrations reported by a confirmatory lab’s GC-ECD method.