目的 建立复方电解质注射液中钠、钾、镁离子的定量测定方法。方法 采用原子分光光度法，钠、钾离子以氯化铯为掩蔽剂，镁离子以氧化镧为掩蔽剂，钠、钾、镁3种离子分别于589、766.5、285.2 nm处进行测定。结果 钠、钾、镁3种离子线性关系良好。平均回收率分别为99.8%、100.7%、99.4%。结论 本方法简便、快捷、准确，可用于复方电解质注射液中钠、钾、镁离子的定量测定。

Objective To establish a determination method for sodium, potassium, and magnesium ions in multiple electrolytes injection. Methods Sodium, potassium, and magnesium ions were determined at 589, 766.5, and 285.2 nm using agent caesium chloride and lanthanum oxide as masking agents by flame atomic absorption spectrometry. Results The linear of sodium, potassium, and magnesium were good. The average recovery rates of them were 99.8%, 100.7%, and 99.4%. Conclusion The method is simple, rapid, and accurate, which could meet the requirements for the determination of sodium, potassium, and magnesium ions in multiple electrolytes injection.