Ammonia as (NH4+) Back Catalog number: 50632 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended CBP-236 2,3,6-Trichlorobiphenylene, 1.2ml x 50ug/ml, nonane Price on request 678427 Heptachlor-exo-epoxide, 100 µg/ml, Acetonitrile, Price on request 91862 Surrogate Standard Price on request