EPA Method 8121 Surrogate Standard Back Catalog number: 81204 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679871 Tri-p-cresyl phosphate, 100 µg/ml, Methanol, 5ml Price on request 96131 Diethylene glycol Price on request 72658 m-Tolualdehyde Price on request