Ammonia as (NH4+) Back Catalog number: 54214 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended ME 20030 Aqueous Ethanol Standard (0.3g/l), 10 x 1,2ml Price on request 2778.10-100 Heptachlor-exo-epoxide (cis-), 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 28044-83-9 Price on request 70899 6-Methylchrysene Price on request