EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 13600-0145-1000ME tert.-Butyl-ethylether, 1000µg/ml in MeOH, 5ml Price on request 10424.20-100-T 3-Nitrobenzo[e]pyrene Price on request 11350.14-10MG Meclofenamic acid sodium salt,neat,neat,10mg, Price on request