EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79168 Heptachlor epoxide Price on request 70465 trans-Permethrin, 1000µg/ml in MeOH, 1ml Price on request 673498 4,4'-Dichlorobenzophenone, 250mg Price on request