EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8970.39-100-T 3-Chloro-1,2-propandiol-dioleate Price on request 10828.16-100MG Penicillin G Sodium Salt Price on request 1092.18-K-IO 2-tert-Butylanthracene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 18801-00-8 Price on request