EPA Method 601 Internal Standard Back Catalog number: 19094 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679524 13C6-Sulfaquinoxaline, 10mg Price on request 673409 Phenthoate, 100 µg/ml, Acetonitrile, 5ml Price on request 24002 EPA Method 8240A - Purgeable Surrogate Std Price on request