EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended PF4OPEA Perfluoro-4-oxapentanoic acid (PFMPA), 1.2ml x 50ug/ml, methanol Price on request 92664 1,7-Octadiene Price on request 677011 D4-Quinoclamine, 100 µg/ml, Acetonitrile, 1ml Price on request