一种通过流动注射分析与在线预富集进行铅测定的灵敏分光光度法。
A sensitive spectrophotometric method for lead determination by flow injection analysis with on-line preconcentration.
作者信息
Di Nezio María S, Palomeque Miriam E, Fernández Band Beatriz S
机构信息
FIA Laboratory, Department of Chemistry, Universidad Nacional del Sur, Avenida Alem 1253, 8000 Bahia Blanca, Argentina.
出版信息
Talanta. 2004 May 28;63(2):405-9. doi: 10.1016/j.talanta.2003.11.012.
A new flow injection (FI) system for the determination of Pb(II) at trace level with a preconcentration step and spectrophotometric detection is proposed. It is based on preconcentration of lead ions on chitosan and dithizone-lead complex formation in aqueous medium (pH 9). The chemicals and FIA variables influencing the performance of the system were optimized and applied to the determination of lead in natural, well, and drinking water samples. It is a simple, highly sensitive, and low cost alternative methodology. The method provided a linear rage between 25 and 250mugl(-1), a detection limit of 5.0ngml(-1) and a sample throughput of 15h(-1). The obtained results of spiked samples are in good agreement between the proposed method and ICP-AES.
提出了一种用于痕量铅（II）测定的新型流动注射（FI）系统，该系统带有预富集步骤和分光光度检测。它基于在水介质（pH 9）中壳聚糖对铅离子的预富集以及双硫腙-铅配合物的形成。对影响该系统性能的化学试剂和流动注射分析变量进行了优化，并将其应用于天然水、井水和饮用水样品中铅的测定。这是一种简单、高灵敏度且低成本的替代方法。该方法的线性范围为25至250μg l⁻¹，检测限为5.0 ng ml⁻¹，样品通量为15 h⁻¹。加标样品的测定结果在所提出的方法和电感耦合等离子体发射光谱法（ICP - AES）之间具有良好的一致性。
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