EPA Method 524 & 624 - Internal Standard Back Catalog number: 19494 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 50745 ICP Mix #2 Price on request 3172.24-K-IO Methyl tricosanoate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 2433-97-8 Price on request N-13985-100MG 2,4-D Choline salt, 100mg Price on request