EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 96606 Naloxone Price on request 674680 D4-2-Hydroxybenzonitrile, 5mg Price on request 70252 Phenol-d6, 1000µg/ml in MeOH, 1ml Price on request