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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >An intelligent flow analyser for the in-line concentration, speciation and monitoring of metals at trace levels
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An intelligent flow analyser for the in-line concentration, speciation and monitoring of metals at trace levels

机译：智能流量分析仪，用于痕量金属的在线浓度，形态和监测

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摘要

An intelligent and versatile flow system is proposed for the in-line speciation and/or concentration of metal ions at a wide range of concentrations without requiring manifold reconfiguration. On one hand, sample enrichment strategies are accomplished using packed-bed reactors, on the other hand speciation procedures are readily performed exploiting the selective complexation of the different oxidation states with the appropriate chromogenic reagents. The potentials of the automated methodology were evaluated using the spectrophotometric monitoring of iron as a model of chemistry. Under the optimised physical and chemical variables, linear analytical curves over the ranges 0.025–0.5 or 2.0–40 mg l~(-1) Fe were attained. The 3 detection limit, the repeatability at the 0.5 mg l~(-1) level, the enrichment factor for a sampling volume of 10 ml, and the maximum injection throughput were 8.4 ng ml~(-1) Fe, 2.5%, 58.6 and 22 h~(-1), respectively. The flowing system was applied to the speciation analysis of iron in waters, pharmaceutical formulations and agricultural products, using ICP-OES detection as an external reference method for total iron determination. A remarkable feature of the expert system hereby presented is the ability to decide by itself if the pre-concentration and/or oxidation of the sample zone is required.
机译：提出了一种智能且通用的流动系统，用于在各种浓度范围内对金属离子进行在线形成和/或浓缩，而无需进行多方面的重新配置。一方面，使用填充床反应器完成了样品富集策略，另一方面，利用不同的氧化态与合适的生色试剂的选择性络合，可以轻松进行物种形成程序。使用铁的分光光度监测作为化学模型，评估了自动化方法的潜力。在优化的物理和化学变量下，获得了0.025–0.5或2.0–40 mg l〜（-1）Fe范围内的线性分析曲线。 3个检出限，0.5 mg l〜（-1）水平的重复性，10 ml采样量的富集因子和最大进样量为8.4 ng ml〜（-1）Fe，2.5％，58.6和22 h〜（-1）。流动系统用于ICP，OES检测作为总铁含量的外部参考方法，用于水，药物制剂和农产品中铁的形态分析。在此提出的专家系统的显着特征是能够自行决定是否需要对样品区进行预浓缩和/或氧化。

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