Preconcentration of platinum group metals on modified silicagel and their determination by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry in airborne particulates

Platinum and rhodium associated with the leaves of Nerium oleander L.; analytical method using voltammetry; assessment of air quality in the Palermo (Italy) area

“…This requires the development of good analytical methods to measure very low Pt and Rh concentrations in environmental and biological matrices, as well to estimate background concentrations of both. Since Pt is the main component of Pt/Rh-catalysts, the efforts were focused on the reliable analysis of Pt in environmental samples [37][38][39][40][41][42]. A direct determination of Pt using ICP-MS, for instance, is problematic, due to problems related to isolating this metal from the matrix and to interfering signals which cannot be eliminated [42,43]; as a consequence, alternative methods should be preferred.…”

Estimation of platinum in environmental water samples with solid phase extraction technique using inductively coupled plasma mass spectrometry

“…Solid phase extraction has been demonstrated to be a highly effective preconcentration method when first applied to spectrometric determination [14,19,20]. Among the different sorbents that were tested for this enrichment stage are resins such as polyacrylacylaminothiourea [21], imidazoline [22], Metalfix-Chelamine [23,24], Amberlite XAD-16 [25], Amberlite XAD-7 [26], Dowex 1-X10 [27], Polyorgs 17 [28], HHY-10A macropore anion resin [29], activated alumina [30] and modified silica gels like silica gel functionalized with 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide [31], modified silicagel SeparonTM SGX [32], silica gel modified with propylamine groups [33]. Very good sorption properties of this last resin led us to choose it for the present study.…”

Sorption of platinum on immobilized microorganisms for its on-line preconcentration and chemiluminescent determination in water samples

“…The LOD of the CL method is significantly lower than that obtained by ICP-AES after preconcentration of Pt(IV) on activated carbon modified with ethyl-3-(2-aminoethylamino)-2-chlorobut-2-enoate (9 ng mL −1 ) [25] and activated carbon modified with 2,6-diaminopyridine (0.29 ng mL −1 ) [26]. The obtained LOD is comparable with that obtained by ICP-MS after solid-phase extraction of analyte complexes on modified silica gel Separon SGX C18 (0.05 ng mL −1 Pt) [27] and anion-exchange sorbent Dowex AG1-X8 (0.15 ng g −1 ) [28] and the same as LOD of ETAAS method with biosorption of platinum on Aspergillus fungi [17]. The calibration graph obtained for standard solutions of Pt(IV) was linear in the concentration range 0.05–2 ng mL −1 .…”