Development of preconcentration method for ultra trace analysis

超痕量分析预富集方法的开发

• 批准号: 04650673
• 负责人: AKATSUKA Kunihiko
• 金额: $ 1.41万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650673/
• 关键词: Atomic spectroscopy; preconcentration; dynamically coated resin; seawater; trace elements; on-line preconcentration; 海水分析; 白金

1. An on-line preconcentration method was developed to allow the simultaneous determination of Mn, Co, Ni, Cu, An, Cd and Pb in 5 ml environmental water samples by inductively coupled plasma mass spectrometry. A semiautomated system with a microprocessor-controlled high performance quaternary gradient pump and valves was used to lead and transport the mobile phase. The system includes a column containing silica-immobilized 8-hydroxyquinoline. The pH of samples, and conditions of quantitative elution from column were discussed. The good precision and accuracy of this method are demonstrated by analysing of standard samples of riverine water (SLRS-2), estuarine water (SLEW-1) and coastal seawater (CASS-2). The detection limits of the method range from 7 ng/1 for Cd to 130 ng/1 for Zn.2. A method is developed for the rapid separation/preconcentration of trace elements in seawater samples. Cadmium, zinc and other trace elements are adsorbed on to the dynamically coated resin which was prepared by the reaction of ODS silica with aliquat 336. The cadmium and zinc ions was quantitatively collected on the resin from acidified solution containing 0.5-1.0 M HCI.Most of the diverse ions were separated by this procedure. The loaded elements was eluted by 2 ml of 1M nitric acid. The concentration of the elements was determined by graphite furnace atomic absorption spectroscopy and ICP-MS.The detection limits of the method was 3 ppt for Cd and 4 ppt for Zn, based on 200 ml of seawater samples.

1. 建立了电感耦合等离子体质谱法同时测定5 ml环境水样中Mn、Co、Ni、Cu、An、Cd和Pb的在线富集方法。使用具有微处理器控制的高性能四元梯度泵和阀门的半自动化系统来引导和运输流动相。该系统包括含有二氧化硅固定的 8-羟基喹啉的柱。讨论了样品的pH值和柱定量洗脱的条件。通过对江河水(SLRS-2)、河口水(SLEW-1)和近岸海水(CASS-2)标准样品的分析表明该方法具有良好的精密度和准确度。该方法的检测限范围为 Cd 的 7 ng/1 至 Zn.2 的 130 ng/1。开发了一种快速分离/富集海水样品中微量元素的方法。镉、锌等微量元素吸附在ODS二氧化硅与aliquat 336反应制备的动态涂覆树脂上。从含有0.5-1.0 M HCl的酸化溶液中定量收集镉和锌离子在树脂上。通过该程序分离了不同的离子。加载的元素用2ml 1M硝酸洗脱。采用石墨炉原子吸收光谱和ICP-MS测定元素浓度。基于200 ml海水样品，该方法的检测限为Cd 3 ppt和Zn 4 ppt。