A two-sample set for dilution up to 2 litres of reagent water. Ampoule 1:Ammonia-N. 2.02 mg/LNitrate-N . 2.01 mg/LNitrite-N. 1.49 mg/L Orthophosphate as P . 0.753 mg/LAmpoule 2:Total Kjeldahl-Nitrogen . 7.49 mg/LTotal Phosphorus. 1.75 mg/L