FI溶剂萃取与ICP-AES联机的研究水样中微量铜的测定

本文建立了用FI-溶剂萃取-ICP-AES测定水样中微量铜的分析方法。选择了ICP-AES、超声雾化发生器及FIA的最佳工作条件。研究了溶液pH对用打萨腙-四氯化碳体系萃取铜的影响;有机相流速与水相流速之比例;萃取盘管长度等因素对萃取过程及等离子体放电的影响。分析了自来水样品及美国标准局标准水样中铜含量。统计了分析方法的精密度、检出限与实验条件下的富集倍数。

The Determination of cu in Water Samples with flow Injection Solvent Extraction and Inductively Coupled Plasma Atomic Emission Spectrometry

A simple flow injection solvent extraction and ICP-AES with ultrasonic nebulizer system is demonstrated for the determination of Cu in wa ter samples with dithizoze-carbon tetrachloride on-line extraction. The Operating condition of ICP-AES, ultrasonic nebulization generator, and flow injection analyszer were optimized for the determination of Cu. The effect of solution pH on the extraction of Cu with dithizone, the extraction coil length,the ratio of organic solvent flow rate to aqueous sample flow rate were studied. The accuracy of the method was evaluated with the determination of Cu in a NBS reference sample (water 1643a) A good agreement between the experimental result and the certified value was obtained. The relative standard deviation of six repeated injections of standard Cu solution was about 2.5%. The detection limit of Cu with this technique is 0.1ng/mL for both peak area and peak height measurements, which is about one order of magnitude better than that with the conventional sample introduction to ICP discharge. About a ten fold preconcentration factor could be achieved with the technique demonstrated in the present work. The sample throughput is 25 samples per hour.