EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66077 PCB No. 77, 100µg/ml in Isooctane, 1ml Price on request 679631 D3-4-Acetamidoantipyrine, 10mg Price on request MDF-12346789 Octachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene Price on request