EPA Method 200.8 Internal Standard Back Catalog number: 56332 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 93083 APH Volatile Standard Price on request 680123 Nicotinic acid, 250mg Price on request 2764.12-1ML 4,4'-Diaminodiphenyl ether, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 101-80-4 Price on request