Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2892.12-K-IO Diethyl phthalate-3,4,5,6-d4, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 93952-12-6 Price on request 678220 1-(4-Isopropylphenyl)urea, 100 µg/ml, Acetonitrile, 1ml Price on request 54141A Ferrous Iron (Fe) Price on request