EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3558.14-10MG 1,5-Dihydroxy-9,10-anthraquinone, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 117-12-4 Price on request D455495 N,N'-Diisopropylcarbodiimide, 500mg Price on request 676784 Diquat dibromide monohydrate, 100 µg/ml, Water, Price on request