EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682526 4-Hydroxybenzoic acid, 1000mg Price on request 679076 Methoprene, 100 µg/ml, Acetonitrile, 1ml Price on request 680374 Trichloroethene, 100 µg/ml, Acetonitrile, 1ml Price on request