Mass-Labelled PCDD & PCB Internal Standard Solution, which contains the following;

MASS-LABELLED PCDDs
1,3,7,8-Tetrachloro[13C12]dibenzo-p-dioxin10 ng/ml
1,2,4,7,8-Pentachloro[13C12]dibenzo-p-dioxin10 ng/ml
1,2,3,4,6,8-Hexachloro[13C12]dibenzo-p-dioxin10 ng/ml
1,2,3,4,6,7,9-Heptachloro[13C12]dibenzo-p-dioxin10 ng/ml
MASS-LABELLED PCBs (IUPAC)
2,3',4',5-Tetrachloro[13C12]biphenyl (70L)10 ng/ml
2,3,3',5,5-Pentachloro[13C12]biphenyl (111L)10 ng/ml
2,2',3,4,4',5'-Hexachloro[13C12]biphenyl (138L)10 ng/ml
2,2',3,3',5,5',6-Heptachloro[13C12]biphenyl (178L)10 ng/ml