EPA Method 515.1 Internal Standard Back Catalog number: 30023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684698 Pirenzepine dihydrochloride, 250mg Price on request 675392 1,1,2-Trichloroethane, 100 µg/ml, Methanol, 5ml Price on request PCB-IS-B20 Mass-Labelled PCB Solution/Mixture , 1.2ml, nonane Price on request