EPA Method 8121 Surrogate Standard Back Catalog number: 81204 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677601 Pyridoxamine dihydrochloride monohydrate, 100mg Price on request 79400 Butyric acid Price on request 678057 Triisobutyl phosphate, 1000mg Price on request