Chemistry Department, University of the Balearic Islands, Palma, Spain.
Anal Bioanal Chem. 2011 Jul;400(10):3585-94. doi: 10.1007/s00216-011-5005-4. Epub 2011 May 14.
A smart fully automated system is proposed for determination of thorium and uranium in a wide concentration range, reaching environmental levels. The hyphenation of lab-on-valve (LOV) and multisyringe flow injection analysis (MSFIA), coupled to a long path length liquid waveguide capillary cell, allows the spectrophotometric determination of thorium and uranium in different types of environmental sample matrices achieving high selectivity and sensitivity levels. Online separation and preconcentration of thorium and uranium is carried out by means of Uranium and TEtraValents Actinides resin. The potential of the LOV-MSFIA makes possible the full automation of the system by the in-line regeneration of the column and its combination with a smart methodology is a step forward in automation. After elution, thorium(IV) and uranium(VI) are spectrophotometrically detected after reaction with arsenazo-III. We propose a rapid, inexpensive, and fully automated method to determine thorium(IV) and uranium(VI) in a wide concentration range (0-1,200 and 0-2,000 μg L(-1) Th and U, respectively). Limits of detection reached are 5.9 ηg L(-1) of uranium and 60 ηg L(-1) of thorium. Different water sample matrices (seawater, well water, freshwater, tap water, and mineral water), and a channel sediment reference material which contained thorium and uranium were satisfactorily analyzed with the proposed method.
提出了一种用于测定宽浓度范围（达到环境水平）钍和铀的智能全自动系统。在线阀（LOV）和多注射器流动注射分析（MSFIA）的联用，与长光路液波导毛细管池相结合，允许在不同类型的环境样品基质中进行分光光度法测定钍和铀，实现了高选择性和灵敏度水平。铀和四价 Actinides 树脂通过在线分离和预浓缩来实现钍和铀的分离和预浓缩。LOV-MSFIA 的潜力使得系统能够通过在线柱再生和与智能方法相结合实现完全自动化，这是自动化的一个进步。洗脱后，通过与偶氮胂-III 反应，对四价钍和六价铀进行分光光度检测。我们提出了一种快速、廉价且全自动的方法，用于测定宽浓度范围内（分别为 0-1200 μg L(-1) Th 和 0-2000 μg L(-1) U）的四价钍和六价铀。检测限分别达到铀 5.9 ηg L(-1) 和钍 60 ηg L(-1)。不同的水样基质（海水、井水、淡水、自来水和矿泉水）以及含有钍和铀的通道沉积物参考物质均采用所提出的方法进行了满意的分析。
