EPA Method 524 & 624 - Internal Standard Back Catalog number: 19494 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66123 2',3,4,4',5-Pentachlorobiphenyl (123) Price on request 71597 Isoxaben Price on request 674591 Fenthion-sulfone, 100 µg/ml, Acetonitrile, 5ml Price on request