EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3744.10-50-IO 1,2,3,4-Tetrachloronaphthalene, 50µg/mL, Solvent-Isooctane, Unit 1mL, # of units-1, Cas.no. 20020-02-4 Price on request 675595 Tridemorph, 100 µg/ml, Ethyl acetate, 5ml Price on request 91009 (Use Part# 70387) Famphur Price on request