介孔分子筛SBA-15分离富集-火焰原子吸收光谱法测定矿样中铅

来源期刊：冶金分析2010年第11期

论文作者：林品言 周方钦 亓俊霞 栾杰 李晶

文章页码：25 - 29

关键词：介孔分子筛SBA-15； 分离富集； 矿样； 铅； 火焰原子吸收光谱法

Key words：mesoporous molecular sieve SBA-15； separation and enrichment； mineral sample； lead； flame atomic absorption spectrometry

摘    要：研究了介孔分子筛SBA-15材料对痕量Pb²⁺的分离富集性能,探讨了溶液pH值、温度、洗脱条件及共存离子对铅分离富集的影响。在最佳实验条件下,介孔分子筛SBA-15能定量、快速吸附试液中的痕量Pb²⁺,其静态饱和吸附容量为5.36 mg/g,吸附在介孔分子筛SBA-15上的Pb²⁺可用0.05 mol/L HNO₃-CH₃COOH完全洗脱,洗脱下来的Pb²⁺用火焰原子吸收法测定,方法线性范围为0.05~25.00μg/mL,铅的检出限为35 ng/mL。该方法已用于标准矿样和日常矿样中铅的测定,两个标准矿样测定结果的相对标准偏差(RSD)分别为3.8%和4.5%(n=5),日常矿样的加标回收率在98.7%~106%之间。

Abstract: The separation and enrichment properties of mesoporous molecular sieve SBA-15 to trace Pb²⁺ were studied.The effect of solution pH,temperature,elution condition and coexisting ions on the separation and enrichment of Pb²⁺ was discussed.Under the optimal experimental conditions,the mesoporous molecular sieve SBA-15 could quantitatively and rapidly adsorb Pb²⁺ in sample solution.The static saturation adsorption capacity was 5.36 mg/g.The adsorbed Pb²⁺ on mesoporous molecular sieve SBA-15 could be fully eluted with 0.05 mol/L HNO₃-CH₃COOH.The eluted Pb²⁺ was determined by flame atomic absorption spectrometry.The linear range of method was 0.05-25.00 μg/mL.The detection limit of lead was 35 ng/mL.This method has been applied to the determination of lead in standard mineral and daily mineral samples.The relative standard deviations (RSD) were 3.8% and 4.5%(n=5),respectively.The recoveries of standard addition were 98.7%-106%.