Mass-Labelled PCDD & PCB Sampling Spike Solution, which contains ;

MASS-LABELLED PCDD & PCB (IUPAC)
1,2,3,4-Tetrachloro[13C12]dibenzo-p-dioxin (—)10 ng/ml
3,3',4,5'-Tetrachloro[13C12]biphenyl (79L)10 ng/ml