EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 95280 PAH IS/S Standard, 4000µg/ml in MeChl., 1ml Price on request 73580 Ethyl vanillin Price on request 681875 Trinexapac, 100 µg/ml, Acetonitrile, 1ml Price on request