流动注射在线膜分离预富集在原子光谱中的应用

FI On-line Membrane Separation/Preconcentration and Its Application in Atomic Spectrometry

研究了ＩＤＡＥ（Ｉｍｉｎｏｄｉａｃｅｔｉｃａｃｉｄ／ｅｔｈｙｌｃｅｌｕｌｏｓｅ）膜的在线分离预富集环境水样品中痕量元素的流动注射分析系统。建立了将在线流动注射这一体系与火焰原子吸收、电感耦合等离子体原子发射光谱联用，通过计算机辅助采集数据点，实现天然水样品中痕量重金属元素Ｃｄ，Ｃｏ，Ｃｕ，Ｐｂ，Ｍｎ，Ｖ，Ｎｉ等的在线分离预富集的原子光谱分析方法。本方法的测定速率达到３０次／ｈ，浓集倍数达２０倍。同时我们还考察了体系的检出限、相对标准偏差、加标回收率、膜的动态容量和动态富集性能、富集效率、使用寿命等，取得了令人满意的结果。实验结果表明，流动注射分析（ＦＩＡ）在线分离预富集比起微型柱分离来说，有许多优点，如：分析速度快、自动化程度高、操作简便、不易堵塞、寿命长、重现性好、样品的消耗量少等。ＩＤＡＥＣ膜分离预富集与ＦＩＡ－ＩＣＰ－ＡＥＳ联用的体系，是一种极为方便，高效而且普遍适用，易于推广的测定环境水样品中痕量重金属元素的手段。

The iminodiacetic acid/ethyl cellulose(IDAEC) membrane was applied to the FI on-line separation and preconcentration for the trace elements in environmental waters. The system was copied with both AAS and ICP-AES. The optimization of the system was performed. The preconcentration factor of 20 could be reached. The asmple up-take rate is 30 per hour. The system developed in this work has the advantages of fast analysis, automatic operation, less asmple consumption.