Ammonium ions assay HACH/ Marchut-Mikołajczyk O., PhD Author/User Keywords: nitrogen, ammonia ions equipment required: spectrophotometer execution time: 20 minutes Description: http://www.hach.com/nitrogen-ammonia-reagent-set-salicylate-method-10ml/product?id=7640208940 Ryc. Nitrogen-Ammonia Reagent Sets