Internal Standard Back Catalog number: 95592 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2570.24-K-IO o-Quarterphenyl, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 641-96-3 Price on request 11365.6-10MG N-Nitroso-4-(2-hydroxyethyl)-piperazin-2-one,neat,neat,10mg, Price on request 30057 EPA Method 552 Surrogate Standard Methyl Ester Price on request