EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9427.5-100-IO Hexachlorocyclopentadiene, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 77-47-4 Price on request 675483 Tetramisole hydrochloride, 100mg Price on request 95171 Sucrose (1% Total Organic Carbon) Price on request