Validation of Some Procedures for Quantifying Platinum at sub‐μg/L Level in Some Real Matrices by Catalytic Adsorptive Stripping Voltammetry

Abstract

The potential toxicological properties of platinum group elements, usually present in real matrices at sub-ng/g level, explain the increasing interest in developing specific and sensitive analytical methods. In this work, a validation study was performed in order to ensure the fitness-for-purposes of procedures developed for quantifying platinum in tap water, beer and lettuce using an extremely sensitive method based on catalytic adsorptive stripping voltammetry. The work involved the estimation of selectivity, detection and quantitation limits, range, accuracy (trueness plus precision), uncertainty of measurement (UOM), robustness and recovery. The results are discussed in the light of the most recent literature findings.

Determination of platinum by graphite furnace atomic absorption spectrometry in foods and beverages using an automated on-line separation-preconcentration system

“…Wine serves as an example for the following the path of platinum, beginning with the uptake during the plant growth, continuing with the fermentation process of grape juice and resulting in the final product (Alt, Eschnauer, Mergler, Messerschmidt, & Tölg, 1997). The analysis of samples of tap water, rosé wine in tetrabrik package, bottled white wine, canned lemon tea, camomile in filter bags, peach fruit juice UHT semiskimmed milk, wild chicory, beer and lettuce were also reported (Desimoni, Brunetti, & Bacchella, 2002, 2004. Improvements in detection power, reliability, precision, selectivity and economy of analytical methods are still a challenge to the analyst.…”

Voltammetric Analysis of Trace Levels of Platinum Group Metals – Principles and Applications

“…In the last years, some works have shown the possibility of determining Pt(II) by voltammetric techniques also at subtrace concentration level [93,94], while very recently the literature reports also an interesting procedure relevant to the sequential voltammetric determination of metals linked to vehicle traffic [Pb(II), Pt(II), Pd(II) and Rh(III)] in laurel leaves [74]. This work highlights also that vegetable matrices (in this case laurel leaves) may be employed as biomonitors of the environmental pollution, even if in qualitative way, especially if the plants are in proximity to heavily frequented roads [95].…”

Comparing Some Operational Approaches to the Limit of Detection

“…All details about the Catalytic Adsorptive Stripping Voltammetry (CAdSV) method for quantifying platinum in some real matrices of alimentary and environmental concern have been already published [32][33][34] .…”

“…Experimental data used in the second case study were acquired in the course of a validation study of the CAdSV method for the analysis of platinum in tap water 34 . According to the adopted procedure 42,43 , in this case each analysis required only one measurement of the sample and one after each of three standard additions: this was necessary to minimize problems of contamination of and/or losses of the analyte (present at ultra-trace level) by adsorption effects onto the cell walls.…”