Labelled Injection/Internal Standard Stock Solution - 1.2ml in nonane, which contains the following;

Labelled Injection/Internal (68C-IS) IUPAC (ng/ml)
2,5-Dichloro[13C12] biphenyl 9L 5000
2,2',5,5'-Tetrachloro[13C12] biphenyl 52L 5000
2,2',4,5,5'-Pentachloro[13C12] biphenyl 101L 5000
2,2',3,4,4',5'-Hexachloro[13C12] biphenyl 138L 5000
2,2',3,3',4,4',5,5'-Octachloro[13C12] biphenyl 194L 5000