NDLI: Geochemical behaviour and sources of Platinum Group Elements in anthropogenically-impacted sediments

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Geochemical behaviour and sources of Platinum Group Elements in anthropogenically-impacted sediments

Content Provider	Semantic Scholar
Author	Almécija, Clara
Copyright Year	2015
Abstract	Rhodium (Rh) is present at the Earth’s surface at ultra-trace concentrations (0.06 ng g); however, its use in catalytic converters has increased its deposition nearby traffic pressure and therefore the interest in analytical techniques for Rh determination has increased in the recent years. In this study we propose an improvement of Rh measurement by adsorptive voltammetry applying second-derivative signal transformation. The optimization of experimental parameters affecting the voltammetric analysis were carried out using sediment samples; these include the amount of sample digest used, the hydrochloric and formaldehyde concentrations, equilibration time and deposition potential. The use of the second derivative transformation provides well-defined peaks due to the minimization of background interferences, and leads to a significant decrease in the detection limits. Accordingly, a detection limit of 23 fM Rh in the cell was obtained, which corresponds to 1.6 pg g of Rh for 200 mg of sediments. The optimized methodology was applied to the analysis of Rh in a sediment core collected close to a motorway bridge from Tagus Estuary (Lisbon, Portugal). Here, Rh concentrations ranged from 0.06 to 0.47 ng g, showing a surface Rh-enrichment linked to traffic, which is consistent Improvement of ultra-trace voltammetric determination of Rh in environmental samples by signal transform. 66 with a Pt superficial peak. Reference materials have been also analyzed, including road dust (BCR-723) and river sediment (JSd-2), and values obtained are in agreement with certified concentrations and previously values reported in the literature.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://digital.csic.es/bitstream/10261/116176/1/Tesis_Almecija2015.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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