Volatile Mix

2,3,3',5'-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL,

2,3,4',4'-Tetachlorobiphenyl,100 µg/mL,isooctane,1mL,

Perfluoro-n-[1,2-13C2]hexanoic acid, 50µg/ml in MeOH, 1,2ml