EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended N-ETFOSAA N-ethylperfluoro-1-octanesulfonamidoacetic acid, 1.2ml x 50ug/ml, methanol Price on request 50099 Anion Mix #1 Price on request 673966 Bromoxynil, 100 µg/ml, Acetonitrile, 5ml Price on request