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Ammonium hydrogencitrate is a dibasic ammonium citrate solution can be used as supporting electrolyte in a matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer
A 2099 (OTTO) Ammonium citrate, dibasic, 98% Cas 3012-65-5 - used in pharmaceuticals, rust proofing, cotton printing and plasticizers.