EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 30005 Fortification sol.,2000ug/ml in MeOH,1ml Price on request 81419 Parathion ethyl Price on request 674758 Dicyandiamide, 250mg Price on request