Mass-Labelled PCB Syringe Spike Solution - 1.2ml in nonane, which contains the following;

MASS-LABELLED PCB CONGENERSIUPAC(ng/ml)
2,3',4',5-Tetrachloro[13C12]biphenyl70L20
2,3,3',5,5'-Pentachloro[13C12]biphenyl111L20
2,2',3,4,4',5'-Hexachloro[13C12]biphenyl138L20
2,2',3,3',5,5',6-Heptachloro[13C12]biphenyl178L20