Pérez-Ràfols Clara, Trechera Pedro, Serrano Núria, Díaz-Cruz José Manuel, Ariño Cristina, Esteban Miquel
Departament d'Enginyeria Química i Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
Departament d'Enginyeria Química i Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
Talanta. 2017 May 15;167:1-7. doi: 10.1016/j.talanta.2017.01.084. Epub 2017 Jan 31.
The use of an antimony film coated on a screen-printed carbon electrode (ex-situ SbSPCE) is proposed for the determination of Pd(II) at ppb levels in natural samples by adsorptive stripping voltammetry using dimethylglyoxime as chelating agent. Ex-situ SbSPCE produces a better analytical performance as compared to a commercially sputtered bismuth screen-printed electrode (BiSPE). The detection and quantification limits were 2.7 and 9.0µgL respectively with a good linear behaviour in the wide examined concentration range (from 1µgL up to 100.0µgL, R=0.998). The proposed ex-situ SbSPCE showed an excellent repeatability with a relative standard deviation of 0.5% for ten successive measurements and a very good reproducibility (1.6% for three different ex-situ SbSPCE units within series of ten repetitive assays). Moreover, the ex-situ SbSPCE was successfully applied for the determination of low concentration levels of Pd(II) in spiked tap water with a very high reproducibility (0.2%) and providing equivalent results to those achieved by ICP-MS measurements.
提出使用涂覆在丝网印刷碳电极上的锑膜（非原位SbSPCE），以二甲基乙二肟作为螯合剂，通过吸附溶出伏安法测定天然样品中痕量水平的钯（II）。与市售的溅射铋丝网印刷电极（BiSPE）相比，非原位SbSPCE具有更好的分析性能。检测限和定量限分别为2.7和9.0µgL，在所研究的宽浓度范围内（从1µgL到100.0µgL，R = 0.998）具有良好的线性行为。所提出的非原位SbSPCE具有出色的重复性，连续十次测量的相对标准偏差为0.5%，并且具有非常好的重现性（在十次重复测定系列中，三个不同的非原位SbSPCE单元的重现性为1.6%）。此外，非原位SbSPCE成功应用于加标自来水中低浓度水平钯（II）的测定，具有非常高的重现性（0.2%），并提供与电感耦合等离子体质谱测量相当的结果。
