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以ｐＨ计控制终点，用甲醛滴定法测定含１６种氨基酸的复方氨基酸补铁液中氨基酸态氮的含量。平均回收率９９．０１％，与定氮法及指示剂控制终点的甲醛滴定法相比，具有简便、快速、准确的优点。
The endpoint was controlled by pH meter, and the content of amino acid nitrogen in compound amino acid iron supplementation solution containing 16 kinds of amino acids was determined by formaldehyde titration. The average recovery rate is 99.01%. Compared with the method of titration of formaldehyde by the method of nitrogen determination and indicator control, the method has the advantages of simplicity, speediness and accuracy.