EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677659 Triphenyl phosphate, 10.0 µg/ml, , 10ml Price on request 11996.12-10MG Hydroxytolbutamide-d9 (butyl-d9),neat,neat,10mg Price on request M4M120 2,3',4,5,5'-Pentachloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene Price on request