Electron microbeam analysis of urban road-deposited sediment, Manchester, UK: Improved source discrimination and metal speciation assessment

Taylor, Kevin G.; Robertson, D. J.

doi:10.1016/j.apgeochem.2009.03.011

Cited by 19 publications

(4 citation statements)

References 58 publications

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“…Iron-oxide grains were identified by SEM in all four grain-size fractions (Figure a) and are similar to Pb-bearing iron oxides using electron microprobe analysis on other RDS materials . In addition, Pb- and Cr-bearing grains were noted in the <38 μm fraction (Figure b), and Pb in association with P (Figure c) and in association with Cl (Figure d) was noted in the 63−38 μm and 250−125 μm fractions, respectively.…”

Section: Resultsmentioning

confidence: 61%

Solid-Phase Speciation of Pb in Urban Road Dust Sediment: A XANES and EXAFS Study

Barrett

Taylor²,

Hudson‐Edwards

et al. 2010

Environ. Sci. Technol.

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The quality of the urban environment is of growing concern as its human population continues to dramatically increase. X-ray absorption spectroscopy (XAS) and SEM have been used to study the solid-phase speciation of Pb in urban road dust sediments (RDS) in Manchester, UK. XANES analysis and linear combination modeling indicate that PbCrO(4) and Pb-sorbed goethite occur in 1000-500 microm, 250-125 microm, 63-38 microm, and <38 microm size fractions, collectively representing between 51-67% of the contributing Pb-phases. XANES analysis suggests that PbO, PbCl2, and Pb carbonates are also present. EXAFS modeling for all grain size fractions gives best fit models with a first shell of two oxygen atoms at 2.29-2.32 A, which corroborate the possible presence of Pb-sorbed goethite, and also suggest the presence of Pb phosphates and Pb oxides. Second shell Pb-Fe and second and third shell Pb-Pb scattering distances confirm Pb-sorbed to Fe oxide, and PbCl2 and PbCrO4, respectively. Many of the XAS models are corroborated by SEM observations. The Pb-phases may pose a risk to human health if inhaled or ingested, with insoluble phases such as PbCrO4 potentially causing inflammation in the lungs, and soluble phases such as PbO potentially being the most bioaccessible in the digestive tract.

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Section: Resultsmentioning

confidence: 61%

Solid-Phase Speciation of Pb in Urban Road Dust Sediment: A XANES and EXAFS Study

Barrett

Taylor²,

Hudson‐Edwards

et al. 2010

Environ. Sci. Technol.

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“…This has a potential impact on watersheds, the atmosphere and human health (Chary et al 2008;Taylor and Robertson 2009;Lesven et al 2010;Zhang et al 2012;de La Cueva et al 2014). The three basic types of sediments are mineral detritus, biogenic or organic sediments and anthropogenic particles and compounds (Taylor 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The development and growth of urban areas in cities in southeastern Brazil have led to more motor vehicle traffic and changes in land use, especially with respect to soil sealing conditions. The urbanisation process involves the transport of sediments and pollutants (Poleto et al 2009;Taylor and Robertson 2009) that can be produced by soil erosion and soil movement due to construction works. Sediments are also transported by wind and rain (Badin et al 2008;Zafra et al 2009;Zhang et al 2012) according to the size, shape, concentration, fall velocity and bulk density of particles (Maidment 1993).…”

Section: Introductionmentioning

confidence: 99%

Assessment of loose and adhered urban street sediments and trace metals: a study in the city of Poços de Caldas, Brazil

et al. 2016

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Purpose This study aims to quantify and characterise sediments accumulated in the street gutters in an urban area of Poços de Caldas, Brazil. The main research questions are: What type of urban areas, e.g. those under construction, produce most sediments and what are the main characteristics of such sediments? What differences, e.g. granulometry, can be found in loose and adhered sediments? What trace metals can be found in the sediments? Materials and methods Fieldwork was carried out in a residential area of Poços de Caldas, Brazil. Ten samplings were conducted between May and August 2013 to collect sediments from road gutters. The collected sediments were then divided into 'loose' and 'adhered', depending on whether they were collected in a first, gentle, sweeping with soft bristled brush or in a subsequent sweeping with a stiff bristled brush. Granulometric curves were drawn for both types of sediments. Fine sediment analyses (≤63 μm) were performed on samples from the last five samplings. Two techniques were used to look for trace elements: energy dispersive X-ray fluorescence (EDXRF) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). Results and discussion Larger amounts of sediments were collected after lower intensity rainfall events. Higher intensity events seemed to wash the sediments away. A correlation was found between areas under construction and sediment mass production. A characteristic range of granulometries (medium sand), found in our study is in accordance with studies by other authors. An important presence of heavy metals (Cr, Cd, Pb, Zn, Ni and Cu) was detected and characterised. As and Sn were also detected even though they are not often mentioned in the literature on urban soil pollutants.Conclusions Areas under construction were found to produce more sediments than other areas. The trace metals found in highest concentrations were Pb and As. The heavy metal concentration decreases after wet periods, showing that they are carried by runoff. It is expected that this study may serve as an input for establishing diffuse pollution control and mitigation strategies for the accumulation of pollutants in the urban environment.

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“…In particular, it helps to understand the formation and origin of air pollution, as well as to evaluate the toxicity of fine particles in road dust, which actually contribute to airborne particulate via resuspension [1]. Aim of this work is the study of the speciation of iron and manganese in road dust samples collected on the walls and floor of the ventilation air shaft of Traforo del San Bernardo highway tunnel.…”

Section: Introductionmentioning

confidence: 99%

Fe and Mn speciation in road dust particles by XAS

Bardelli¹,

Cattaruzza

Gonella

et al. 2009

J. Phys.: Conf. Ser.

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Electron microbeam analysis of urban road-deposited sediment, Manchester, UK: Improved source discrimination and metal speciation assessment

Cited by 19 publications

References 58 publications

Solid-Phase Speciation of Pb in Urban Road Dust Sediment: A XANES and EXAFS Study

Solid-Phase Speciation of Pb in Urban Road Dust Sediment: A XANES and EXAFS Study

Assessment of loose and adhered urban street sediments and trace metals: a study in the city of Poços de Caldas, Brazil

Fe and Mn speciation in road dust particles by XAS

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