EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682236 2,2'-Dihydroxy-4-methoxybenzophenone, 250mg Price on request 79329 Chlorobenzilate Price on request 92559 EPA Method 624 Internal / Surrogate Standard Price on request