EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678422 alpha-HCH, 100 µg/ml, Acetonitrile, 5ml Price on request 70476 Benzo(j)fluoranthene Price on request 685284 PAH-Mix 4 deuterated, 10µg/ml in Acetonitrile, 1ml Price on request