Internal Reference Standard Back Catalog number: 52187 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0312.21-200-T Dibenz[a,c]acridine, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 215-62-3 Price on request 679150 13C, 15N2-Semicarbazide hydrochloride, 10mg Price on request 674734 Fenthion-oxon, 100 µg/ml, Acetonitrile, 1ml Price on request