A Monitor's Guide to Water Quality

How are they measured?

In aquatic ecosystems, PCBs can be measured in water, in sediments and in the tissues of organisms like fish. These samples must be submitted to a lab for analysis. PCB concentrations may be reported by labs as total PCBs, or individually by congener or congener groupings.

Related to PCBs: The greater the organic matter content of sediments, the more likely they are to accumulate PCBs if exposed