Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended 55106 SDWA MBAS Price on request 36003 Surrogate Standard Price on request EN-1948SS Sampling Standard Solution, in Nonane/1.6% toluene, 1,2ml Price on request