Evaluation of the contamination of platinum in estuarine and coastal sediments (Tagus Estuary and Prodelta, Portugal)

Cobelo-Garcı́a, Antonio; Neira, Patricia; Mil-Homens, Mário; Caetano, Miguel

doi:10.1016/j.marpolbul.2010.12.018

Cited by 39 publications

(28 citation statements)

References 29 publications

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“…Concentrations obtained in the spiked samples (Table 1) show complete Pt recovery. The determination of platinum in the 0.2 µm PC filters was also undertaken by means of Cat-AdCSV after combustion of the filter followed by acid digestion according to the methodology described in Cobelo-García et al (2011). A typical detection limit of 0.5 ng g -1 (expressed as 3xSD of the blank) was obtained for a suspended particulate matter (SPM) mass of 1 mg. A similar approach was used for the analysis of sediments (Cobelo-García et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Regarding estuarine and coastal systems, the data available are mainly restricted to the sedimentary contamination of Pt in areas subject to anthropogenic pressure (e.g. Tuit et al 2000;Cobelo-García et al 2011). The works by Turetta et al (2003) and Obata et al (2006) constitute the only existing studies to date reporting dissolved Pt values in estuarine waters; in their study, they found concentrations of dissolved Pt in two estuaries of the Tokyo area (Japan) and in the lagoon of Venice (Italy) that were 1-2 orders of magnitude greater than those reported for oceanic waters.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of platinum during estuarine mixing (Pontevedra Ria, NW Iberian Peninsula)

et al. 2013

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The concentrations of Pt in sediments, water and suspended particulate matter (SPM) were determined in the Lérez river estuary (Pontevedra Ria, NW Iberian Peninsula) on two sampling dates in 2008 and 2011, by means of catalytic adsorptive stripping voltammetry. Average concentrations in sediments (1.2 ± 0.5 ng g -1 ; n=13) corresponded to an enrichment factor of 2-4 compared to background values, and were in the range of those found in the SPM during the 2011 sampling (2.1 ± 2.4 ng g -1 ; n=15), but significantly lower than in 2008 SPM (8.0 ± 4.4 ng g -1 ; n=15). Higher dissolved Pt concentrations were also found in 2008 (0.21 and 0.62 pM in the freshwater and seawater end-member) compared to the 2011 campaign (0.03 -freshwater -and 0.40 pM -seawater endmember). Concentrations in the seawater end-members exceed those of typical North Atlantic waters, suggesting inputs of this element within the estuary. The extremely low value for the freshwater end-member in 2011 appears to be among the lowest Pt concentrations ever reported in the literature. Non-conservative behaviour of Pt during estuarine mixing was observed on both sampling dates. Particle-water distribution coefficients (KD) show a decrease with salinity, in agreement with speciation calculations, which predict a transfer from neutral Pt(II) (as Pt(OH)2) in freshwater to negatively charged Pt(IV) (as PtCl5(OH) 2-) species in seawater. Such behaviour during estuarine mixing can play an important role in Pt mobilization from contaminated particles discharged into estuaries and coasts.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behavior of platinum during estuarine mixing (Pontevedra Ria, NW Iberian Peninsula)

et al. 2013

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“…Final concentrations in dust calculated were 8.1, 12.1 and 14.8 ng g À 1 respectively. been extensively reported for diverse environmental compartments [4][5][6][7] but also in the study area [39,40]. It is however surprising the elevated Pt/Rh (85) obtained for the most recent sediment layer, considering that typical Pt/Rh ratios in catalytic converters is around 5 [41] and that other studies in traffic-impacted compartments also reported lower values (5-16; [4,5,42-45] including the road dust reference material BCR-723 [34]).…”

Section: Application Of the Methods To Sediment Samplesmentioning

confidence: 99%

“…storage problems) [27]. ICP-MS is characterized by rapidity, simplicity and multi-elementary capacity [14][15][16][17], although isobaric interferences on Rh 103 -like 63 Cu 40 Ar þ or 91 Zr 12 C þ -may cause severe inaccuracies in the Rh quantification [19], more noteworthy at the ultra-trace concentrations of biological or environmental samples. Thus, the removal of interferences (e.g.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the ultra-trace voltammetric determination of Rh in environmental samples using signal transformation

Almécija

Cobelo-Garcı́a

Santos-Echeandía

2016

Talanta

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Rhodium (Rh) is present at the Earth's surface at ultra-trace concentrations (0.06 ng g(-1)); however, its use in catalytic converters has increased its deposition nearby traffic pressure and therefore the interest in analytical techniques for Rh determination has raised 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 acid and formaldehyde concentrations, deposition potential and equilibration time. The use of the second derivative transformation provided well-defined peaks due to the minimization of background interferences, leading to a significant decrease in the detection limits. Accordingly, a detection limit of 200 fM Rh in the cell was obtained, which corresponds to 14 pg g(-1) of Rh for 200mg 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(-1), showing a surface Rh-enrichment linked to traffic, which was consistent with a Pt superficial peak. Reference materials were also analyzed, including road dust (BCR-723) and river sediment (JSD-2), and values obtained were in agreement with certified concentrations and previously values reported in the literature.

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“…The Pt behavior in the sediments of salt marshes is poorly known. Only two previous studies, also in the Tagus estuary salt marshes, reported a high input of traffic-borne Pt in surface sediments (Almécija et al, 2015;Cobelo-García et al, 2011). Thus, sediments, rhizoconcretions, interstitial waters and roots, stems and leaves of Sarcocornia fruticosa (the halophytic specie with the highest biomass; Caçador et al, 2009) were collected from the salt marshes of the Tagus Estuary (SW Europe) at two different sites, with daily extremely different traffic densities.…”

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Platinum in salt marsh sediments: Behavior and plant uptake

et al. 2016

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Platinum is one of the least abundant elements in the earth crust with an average concentration of 0.51 ng g -1 , but its use in several human activities (mainly automobile catalytic converters) is leading its enrichment in surface sediments. Whereas, previous studies have assessed the Pt behavior in soils from urban areas, natural systems are still poorly studied.Accordingly, this study is aimed to characterize the behavior of the Pt released to coastal environments in sediments, ascertain the role of vegetation on the biogeochemistry of this element and assess the transference of Pt into the biological compartments. Several sediment cores were sampled in salt marshes (in unvegetated and vegetated areas) of the Tagus Estuary under different traffic pressure. Platinum concentration was analyzed in solid sediment, interstitial water and roots, leaves and stems of Sarcocornia fruticosa, a typical plant in south European salt marshes. In addition, interpretative parameters (e.g. redox potential, dissolved oxygen, pH, total reduced sulfur species, salinity and dissolved Fe and Mn in interstitial waters) were determined to better understand the biogeochemical cycle of Pt in salt marsh sediments.Although surface enrichment of Pt exists in the sediments at Low Traffic Station (2.8 ng g -1 ), the highest enrichment was found at High Traffic Station where concentration was, in some cases, up to 40 ng g -1 , linked to traffic emissions. However, dissolved Pt in interstitial waters (from 0.14 to 0.70 ng L -1 ) did not show this superficial maximum. This dissimilarity points out the unreactivity of traffic-borne Pt and the dissolution/precipitation cycle of natural Pt linked to Mn and O 2 cycle, depending on the redox conditions, highly controlled by the vegetation. Platinum concentration in roots (0.9±0.6 ng g -1 ) is reflecting the Pt concentration in the interstitial waters in each moment, even though at the two peaks of dissolved Pt (up to 2.5 ng L -1 ) found at deeper layers, reflecting a low bioaccumulation. However, results pointed that a different Pt species (with different bioavailability) may exist in both stations. Besides, Pt mean value in stems and leaves (0.04±0.05 ng g -1 ) indicates a low translocation of Pt from the roots to aerial parts. Therefore, the role of vegetation is fundamental on the geochemical behavior of Pt in sediments, due to the control of the redox conditions by roots in the surrounding sediments (between the O 2 release and the organic matter degradation) and leading to Pt species of varying bioavailability.

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Evaluation of the contamination of platinum in estuarine and coastal sediments (Tagus Estuary and Prodelta, Portugal)

Cited by 39 publications

References 29 publications

Behavior of platinum during estuarine mixing (Pontevedra Ria, NW Iberian Peninsula)

Behavior of platinum during estuarine mixing (Pontevedra Ria, NW Iberian Peninsula)

Improvement of the ultra-trace voltammetric determination of Rh in environmental samples using signal transformation

Platinum in salt marsh sediments: Behavior and plant uptake

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