Abstract
The new visual expressing methods of PCB, PCDD, and PCDF concentrations were proposed. These methods fulfill the following conditions 1) Concentration differences among isomers are clear. 2) Comparison between samples is easy. 3) Correspondence with chemical structure is easy. 4) It can be expressed compactly. These new methods were applied to the environmental samples. Considering the dynamics of PCBs and PCDD/Fs in the environment, the substitution of chlorine atoms at the 2, 4, 5 positions in PCB, and at the 6, 8 and 7, 8 positions in PCDD/Fs would be key chemical structures.
