EPA Method 8141 Standard Back Catalog number: 93543 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0682.28-200-IO (24R)-24-Methylcholesta-3,5-diene and (24R)-Ethylcholesta-3,5-diene, 200µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 102491-95-2 / 4970-37-0 Price on request 9193.19-10MG Nortriptyline-d3 hydrochloride (N-methyl-d3) Price on request 11399.12-50-IO 2,3,3',4,4',5',6-Heptabromodiphenyl ether,50 µg/mL,isooctane,1mL, Price on request