EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MBP-180 2,2',3,4,4',5,5'-Heptachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane Price on request 91759 CLP - Semi-Volatile Base/Neutral Standard Price on request 71950 2,5-Dimethylthiophene Price on request