The method is suitable for samples which contents nitrate or protein. The sample is digested with sulfuric acid in the presence of a catalyst. This converts organically bound nitrogen to ammonium sulfate. In a distillation apparatus the digestion solution is treated with NaOH and the released ammonia (NH3) is distilled into a solution of boric acid. This solution is then titrated with an acid titrant (HCl or H2SO4) to a pH endpoint of 4.65. ChemTron Titroline 6000自動(dòng)電位滴定儀 優(yōu)萊博 TitroLine 7500KF容量法卡式水份滴定儀 優(yōu)萊博 TitroLine 6000自動(dòng)電位滴定儀