EPA Method 8141 Surrogate Standard Back Catalog number: 92387 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1688.0-2K-T Hydrogensulfide, 2000µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 7783-06-4 Price on request C521002 Citric Acid-2,2,4,4-d4, 10mg Price on request 32661 1,2-Diethylbenzene Price on request