EPA Method 8141/1657 Surrogate Standard Back Catalog number: 92357 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 95665 Internal Standard Price on request 8224.12-100-AN Azinphos ethyl, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 2642-71-9 Price on request 70207 4,4’-Methoxychlor Price on request