EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 680845 Aziprotryne, 100 µg/ml, Acetonitrile, 1ml Price on request 70930 Trichloronate Price on request 685884 Felodipine, 100mg Price on request