EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677488 D8-Ciprofloxacin hydrochloride hydrate, 100 µg/ml, Price on request 10160.12-50MG Carisoprodol, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 78-44-4 Price on request 9397.20-K-ME Citalopram hydrobromide, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 59729-32-7 Price on request