EPA Method 1657 Analytes Back Catalog number: 31784 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679808 Sulfadiazine, 100 µg/ml, Methanol, 1ml Price on request I140004 Ibuprofen-13C,d3, 1mg Price on request 685294 D4-Dopamine hydrochloride, 5mg Price on request