流动注射停流-分光光度法同时测定痕量铝和铁

Simultaneous Determination of Aluminum and Iron by Flow Injection-Stopped Flow-Spectrophotometry

在弱酸性溶液中，基于铝、铁与铬天青Ｓ、溴化十六烷基吡啶形成蓝色三元络合物，采用两次标准加入法，建立了流动注射停流技术同时测定铝、铁的新方法。测定频率９０次／ｈ。铝、铁的线性范围分别为 ０～０．４ ｍｇ／Ｌ和 ０～０．８ ｍｇ／Ｌ。应用于水及食品中痕量铝、铁的测定，结果满意。

A flow injection analysis with stopped flow technique for the simultaneous deter- mination of aluminum and iron is developed based on the formation of Al (Ⅲ), Fe (Ⅲ)- chrome azurol S-cetylpyridinium bromide blue ternary complex in weak acidic solution and double standard addition. The sampling rate is 90 samples/h. The linear range for Al(Ⅲ) is 0-0. 4 mg/L and for Fe(Ⅲ) is 0-0. 8 mg/L. The method has been applied to the determi- nation of Al (Ⅲ) and Fe (Ⅲ) in water and food with satisfactory results.