对氯化铵（NH4Cl）还原法测定饲料中总铁含量的方法进行了研究。结果表明，用原子吸收光谱法测定饲料中的铁含量时，由于Fe3+会生成Fe(OH)3胶体从而影响方法的准确性，用NH4Cl将Fe3+转化成Fe2+将有利于提高方法检测的准确性。

The methods for total iron content determination in feed were studied in this paper. Results showed that the precision in the total ion content determination by atomic absorption spectrometry was obviously influenced by the forming of iron hydroxide colloid from ferric ions. In order to achieve a high precision of absorbance readings, it was necessary to reduce the ferrous ions to ferrous ions with ammonium chloride as reducing agent.