Determination of Pd(II) using an antimony film coated on a screen-printed electrode by adsorptive stripping voltammetry

Publication date: 15 May 2017
Source:Talanta, Volume 167
Author(s): Clara Pérez-Ràfols, Pedro Trechera, Núria Serrano, José Manuel Díaz-Cruz, Cristina Ariño, Miquel Esteban
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 (BispSPE). The detection and quantification limits were 2.7 and 9.0µgL⁻¹ respectively with a good linear behaviour in the wide examined concentration range (from 1µgL⁻¹ up to 100.0µgL⁻¹, R²=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.

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