| Literature DB >> 31435745 |
Carlos Eduardo Monteiro1,2, Margarida Correia Dos Santos3, Antonio Cobelo-García4, Pedro Brito5, Miguel Caetano5.
Abstract
The spatial distribution of Pt and Rh was assessed in Tagus estuary and their sources discussed. Both elements were analysed in superficial sediment samples (n = 72) by adsorptive cathodic stripping voltammetry. Concentrations varied within the following ranges: 0.18-5.1 ng Pt g-1 and 0.02-1.5 ng Rh g-1. Four distinct areas were established: "reference"; waste- and pluvial water discharge; motorway bridges and industrialised areas. The calculated reference median concentrations were 0.55 ng Pt g-1 and 0.27 ng Rh g-1. Linear relationships were found between Pt and Al, Fe and LOI, whereas Rh depicted scattered patterns. The highest concentrations were found nearby industrialised areas and a motorway bridge, corresponding to the enrichment of 10 and 6 times the background of Pt and Rh, respectively. The main sources of contamination to the Tagus estuary derived from historical and present industrial activities and from automotive catalytic converters. Large variations of Pt/Rh ratio (0.48-39) point to different sources, reactivity and dilution effects.Entities:
Keywords: Anthropogenic contamination; Platinum group elements; Spatial distribution; Superficial sediments; Tagus estuary
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Year: 2019 PMID： 31435745 DOI： 10.1007/s10661-019-7738-z
Source DB: PubMed Journal: Environ Monit Assess ISSN： 0167-6369 Impact factor: 2.513