WP-ISS Internal Standard Solution - 1.2 ml in nonane which contains;

INTERNAL STANDARDS: MASS-LABELLED PCBs IUPAC (ng/ml)

2,3',4',5-Tetrachloro[13C12]biphenyl 70L (1000) 2,3,3',5,5'-Pentachloro[13C12]biphenyl 111L (1000) 2,2',3,4,4',5'-Hexachloro[13C12]biphenyl 138L (1000) 2,2',3,3',4,4',5-Heptachloro[13C12]biphenyl 170L (1000)