火焰原子吸收光谱法测定拟薄水铝石中铁

Determination of Iron in Pseudo-Boehmite by FAAS

一种共沉淀分离基体铝的方法用于拟薄水铝石的火焰原子吸收光谱法测定。该法将拟薄水铝石的试样溶液在指示剂存在下调至pH13左右,用过氧化氢溶液氧化,在镁离子存在下生成Fe(OH)3-Mg(OH)2共沉淀,用硝酸(5+95)溶解后用火焰原子吸收光谱法测定。多次测定的相对标准偏差在0.88%—1.47%,样品的加标回收率在88.2%—104.9%之间。该法可用于拟薄水铝石中铁含量≥0.0005%的测定。

A matrix coprecipitation separation flame atomic absorption spectrometry is proposed for the determination of trace amounts iron.In the present method,the sample solution was preseted to pH 13,and oxidized with hydrogen peroxide,coprecipitated Fe3＋ with Mg2＋.The formed precipitate was dissolved with nitric acid.The iron was determined with flame atomic absorption spectrometry.The RSDs are 0.88%—1.47% and the recoveries are 88.2%—104.9%.The present method was applied to the analysis of pseudo-boehmite when the content of iron is above 0.0005%.