EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3227.20-K-IO Arachidonic acid (5,8,11,14 all-cis), 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 506-32-1 Price on request 673469 Acephate, 100 µg/ml, Ethyl acetate, 5ml Price on request BRP-3 3-Bromophenol, 1.2ml x 100ug/ml, toluene Price on request