Laboratory of Analytical Chemistry for Research and Development (QUIANID), Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, Padre J. Contreras 1300, Parque Gral. San Martín, M5502JMA Mendoza, Argentina.
Talanta. 2013 Apr 15;108:46-52. doi: 10.1016/j.talanta.2013.02.067. Epub 2013 Mar 7.
A novel and highly efficient microextraction methodology based on the use of palladium nanoparticles (Pd NPs) was developed for the preconcentration and determination of Hg in water samples. Selective separation of the analyte was achieved by application of dodecanethiolate-coated Pd monolayer-protected clusters (C12S Pd MPCs) in a liquid-liquid microextraction technique (LLME). A volume of 20 μL of toluene phase containing C12S Pd MPCs was used for extraction and final phase was injected in an electrothermal atomic absorption spectrometer (ETAAS) for Hg detection. The effects of different variables, such as sample volume, extraction time, and NPs dispersion volume were carefully studied. A sensitivity enchancement factor of 95 was obtained under optimal experimental conditions. Furthermore, low detection limit (7.5 ng L(-1)) and good precision (relative standard deviation of 4.1% at 0.25 μg L(-1) Hg and n=10) were achieved. The proposed method can be considered as a rapid, cost-effective, and efficient alternative for Hg determination in water samples like river, lake, mineral and tap water.
基于钯纳米粒子（Pd NPs）的使用，开发了一种新颖且高效的微萃取方法，用于水样中 Hg 的预浓缩和测定。通过在液-液微萃取技术（LLME）中应用十二硫醇涂层的钯单层保护簇（C12S Pd MPCs），实现了对分析物的选择性分离。使用 20 μL 的甲苯相，其中含有 C12S Pd MPCs，用于萃取，最终相被注入电热原子吸收光谱仪（ETAAS）中进行 Hg 检测。仔细研究了不同变量的影响，如样品体积、萃取时间和 NPs 分散体积。在最佳实验条件下，获得了 95 的灵敏度增强因子。此外，还实现了低检测限（7.5 ng L(-1)) 和良好的精密度（在 0.25 μg L(-1) Hg 和 n=10 时相对标准偏差为 4.1%）。该方法可被视为快速、经济有效且高效的替代方法，用于测定河水、湖水、矿泉水和自来水等水样中的 Hg。
