Rodríguez Rogelio, Leal Luz, Miranda Silvia, Ferrer Laura, Avivar Jessica, García Ariel, Cerdà Víctor
Renewable Energy and Environmental Protection Department, Advanced Materials Research Center (CIMAV) S.C., Chihuahua 31109, Chihuahua, Mexico.
Renewable Energy and Environmental Protection Department, Advanced Materials Research Center (CIMAV) S.C., Chihuahua 31109, Chihuahua, Mexico.
Talanta. 2015 Feb;133:88-93. doi: 10.1016/j.talanta.2014.04.093. Epub 2014 Jul 7.
A new, fast, automated and inexpensive sample pre-treatment method for (99)Tc determination by inductively coupled plasma-mass spectrometry (ICP-MS) detection is presented. The miniaturized approach is based on a lab-on-valve (LOV) system, allowing automatic separation and preconcentration of (99)Tc. Selectivity is provided by the solid phase extraction system used (TEVA resin) which retains selectively pertechnetate ion in diluted nitric acid solution. The proposed system has some advantages such as minimization of sample handling, reduction of reagents volume, improvement of intermediate precision and sample throughput, offering a significant decrease of both time and cost per analysis in comparison to other flow techniques and batch methods. The proposed LOV system has been successfully applied to different samples of environmental interest (water and soil) with satisfactory recoveries, between 94% and 98%. The detection limit (LOD) of the developed method is 0.005 ng. The high durability of the resin and its low amount (32 mg), its good intermediate precision (RSD 3.8%) and repeatability (RSD 2%) and its high extraction frequency (up to 5 h(-1)) makes this method an inexpensive, high precision and fast tool for monitoring (99)Tc in environmental samples.
本文介绍了一种用于通过电感耦合等离子体质谱（ICP-MS）检测来测定（99）Tc的新型、快速、自动化且廉价的样品预处理方法。这种小型化方法基于阀上实验室（LOV）系统，可实现（99）Tc的自动分离和预富集。所使用的固相萃取系统（TEVA树脂）提供了选择性，该系统能在稀硝酸溶液中选择性保留高锝酸盐离子。所提出的系统具有一些优点，如样品处理量最小化、试剂体积减少、中间精密度和样品通量提高，与其他流动技术和批次方法相比，每次分析的时间和成本显著降低。所提出的LOV系统已成功应用于不同的环境相关样品（水和土壤），回收率令人满意，在94%至98%之间。所开发方法的检测限（LOD）为0.005 ng。树脂的高耐用性及其低用量（32 mg）、良好的中间精密度（RSD 3.8%）和重复性（RSD 2%）以及高萃取频率（高达5 h-1），使得该方法成为监测环境样品中（99）Tc的一种廉价、高精度且快速的工具。
