硝酸钠是一种重要的无机化工原料,广泛用于玻璃、冶金、管件、食品等生产中。目前,硝酸钠的分析,国内外多采用离子交换法、蒸馏法;也有采用杂质减量法。但前者手续烦琐,操作费时,后者在杂质组分复杂时难于得出准确的结果。而火焰光度法和离子选择电极法仅对微量测定较为有效。本文采用差示原子吸收分光光度技术,选用锌的非吸收线330.259/330.294nm作为钠的分析线,对无机盐中的钠离子进行测 Sodium nitrate is an important inorganic chemical raw materials, widely used in glass, metallurgy, pipe fittings, food and other production. At present, the analysis of sodium nitrate, more use of ion exchange method at home and abroad, distillation; also used impurity reduction method. However, the former procedures are cumbersome and time-consuming operation, the latter difficult to come to accurate results in the composition of impurities. The flame photometry and ion-selective electrode method is only effective for trace determination. In this paper, differential spectrometry atomic absorption spectrophotometry, the selection of zinc non-absorption line 330.259 / 330.294nm as the sodium analysis line, the inorganic salt sodium