EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 55088 CWA UV 254 Absorbance/ DOC Price on request X749692 2,4-Xylidine-d6, 10mg Price on request 50718 ICP Mix #1 Price on request