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Instruments / Technical Area	Publication Details	Published	Actions
I18-Microfocus Spectroscopy	Speciation and potential long-term behaviour of chromium in urban sediment particulates Patrick Byrne , Kevin G. Taylor , Karen A. Hudson-Edwards , Judith E. S. Barrett Journal Of Soils And Sediments DOI: 10.1007/s11368-016-1558-3 Diamond Proposal Number(s): [3312] Open Access Show Abstract ▼ Abstract: Purpose: Chromium, a potentially harmful element, occurs commonly within the urban sediment cascade as a result of abundant industrial and transport-related sources. The risks that Cr-bearing particles pose to ecosystems and humans depend on the solid-phase chemical speciation of Cr and its environmental mobility. In this study, we adopt an integrated geochemical approach to investigate and determine the long-term fate of Cr in the urban sediment cascade. Materials and methods: We use bulk chemical digests, sequential chemical extraction analysis, electron microscopy, electron microprobe and microfocus XANES analysis to describe the solid-phase speciation, geochemical characteristics and potential long-term behaviour of Cr in urban particulate matter from both aquatic sediment and road dust sediment (RDS) in Manchester, UK. Results and discussion: Cr-bearing grains within RDS and aquatic sediment are predominantly iron oxides and alumino-silicate glass grains. Electron microprobe analysis indicates Cr concentrations up to 3300 and 133,400 μg g−1 in the RDS and aquatic grains, respectively. XANES analysis indicates that Cr(III) is the dominant oxidation state, with only trace amounts of Cr(VI). Importantly, Cr speciation does not appear to have changed between sedimentary environments and the dominance of Cr(III) suggests limited bioavailability or toxicity under predominant environmental (anoxic and neutral pH) conditions in the aquatic sediment sink. Furthermore, geochemical analyses suggest the environmental mobility of Cr in the aquatic sediment sink is low (compared to other toxic metals) due to its association mainly with alumino-silicate glass grains and its inclusion as an integral part of the glass structure. Conclusions: Industrial glass grains are a major component of urban sediment worldwide. The speciation and geochemical investigations performed in this study suggest most Cr within the urban sediment cascade may be resistant to environmental processes that could mobilise other toxic metals.	Sep 2016
I18-Microfocus Spectroscopy Detectors	Iron and arsenic speciation in marine sediments undergoing a resuspension event: the impact of biotic activity Philippe Bataillard , Sylvain Grangeon , Paul Quinn , Fred Mosselmans , Abdeltif Lahfid , Guillaume Wille , Catherine Joulian , Fabienne Battaglia-Brunet Journal Of Soils And Sediments DOI: 10.1007/s11368-013-0829-5 Diamond Proposal Number(s): [6841] Show Abstract ▼ Abstract: Changes in the chemical conditions of sediment following a resuspension event might lead to release of sequestered pollutants. In the present study, arsenic (As) and iron (Fe) speciation were investigated before and after such an event, in sediment from L'Estaque marina (France). This marina is located near an industrial plant which processed As-bearing ores for several decades.	Jan 2014

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I18-Microfocus Spectroscopy

Speciation and potential long-term behaviour of chromium in urban sediment particulates

Patrick Byrne , Kevin G. Taylor , Karen A. Hudson-Edwards , Judith E. S. Barrett

Journal Of Soils And Sediments

DOI: 10.1007/s11368-016-1558-3

Diamond Proposal Number(s): [3312]

Open Access

Show Abstract ▼

Abstract: Purpose: Chromium, a potentially harmful element, occurs commonly within the urban sediment cascade as a result of abundant industrial and transport-related sources. The risks that Cr-bearing particles pose to ecosystems and humans depend on the solid-phase chemical speciation of Cr and its environmental mobility. In this study, we adopt an integrated geochemical approach to investigate and determine the long-term fate of Cr in the urban sediment cascade. Materials and methods: We use bulk chemical digests, sequential chemical extraction analysis, electron microscopy, electron microprobe and microfocus XANES analysis to describe the solid-phase speciation, geochemical characteristics and potential long-term behaviour of Cr in urban particulate matter from both aquatic sediment and road dust sediment (RDS) in Manchester, UK. Results and discussion: Cr-bearing grains within RDS and aquatic sediment are predominantly iron oxides and alumino-silicate glass grains. Electron microprobe analysis indicates Cr concentrations up to 3300 and 133,400 μg g−1 in the RDS and aquatic grains, respectively. XANES analysis indicates that Cr(III) is the dominant oxidation state, with only trace amounts of Cr(VI). Importantly, Cr speciation does not appear to have changed between sedimentary environments and the dominance of Cr(III) suggests limited bioavailability or toxicity under predominant environmental (anoxic and neutral pH) conditions in the aquatic sediment sink. Furthermore, geochemical analyses suggest the environmental mobility of Cr in the aquatic sediment sink is low (compared to other toxic metals) due to its association mainly with alumino-silicate glass grains and its inclusion as an integral part of the glass structure. Conclusions: Industrial glass grains are a major component of urban sediment worldwide. The speciation and geochemical investigations performed in this study suggest most Cr within the urban sediment cascade may be resistant to environmental processes that could mobilise other toxic metals.

Sep 2016

I18-Microfocus Spectroscopy
Detectors

Iron and arsenic speciation in marine sediments undergoing a resuspension event: the impact of biotic activity

Philippe Bataillard , Sylvain Grangeon , Paul Quinn , Fred Mosselmans , Abdeltif Lahfid , Guillaume Wille , Catherine Joulian , Fabienne Battaglia-Brunet

Journal Of Soils And Sediments

DOI: 10.1007/s11368-013-0829-5

Diamond Proposal Number(s): [6841]

Show Abstract ▼

Jan 2014

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