All Outputs (115)

Predicting trace metal solubility and fractionation in urban soils from isotopic exchangeability (2017)
Journal Article

Metal-salt amended soils (MA, n = 23), and historically-contaminated urban soils from two English cities (Urban, n = 50), were investigated to assess the effects of soil properties and contaminant source on metal lability and solubility. A stable is... Read More about Predicting trace metal solubility and fractionation in urban soils from isotopic exchangeability.

Determining the fate of selenium in wheat biofortification: an isotopically labelled field trial study (2017)
Journal Article

Aims The principal aim of this research was to quantify retention of a single, realistic Se biofortification application (10 g ha-1) in contrasting soils over two growing seasons utilizing an enriched stable Se isotope (77Se) to discriminate between... Read More about Determining the fate of selenium in wheat biofortification: an isotopically labelled field trial study.

Effects of incubation time and filtration method on Kd of indigenous selenium and iodine in temperate soils (2017)
Journal Article

In this study, the effects of incubation time and the method of soil solution extraction and filtration on the empirical distribution coefficient (Kd) obtained by de-sorbing indigenous selenium (Se) and iodine (I) from arable and woodland soils under... Read More about Effects of incubation time and filtration method on Kd of indigenous selenium and iodine in temperate soils.

Historical trends in iodine and selenium in soil and herbage at the Park Grass experiment, Rothamsted Research, UK (2017)
Journal Article

Long term trends in iodine and selenium retention in soil, and uptake by herbage, were investigated in archived samples from the Park Grass Experiment, initiated in 1856 at Rothamsted, UK. Soil (0-23 cm) and herbage samples from plots receiving vario... Read More about Historical trends in iodine and selenium in soil and herbage at the Park Grass experiment, Rothamsted Research, UK.

Population exposure to trace elements in the Kilembe copper mine area, Western Uganda: a pilot study (2016)
Journal Article

The mining and processing of copper in Kilembe, Western Uganda, from 1956 to 1982 left over 15 Mt. of tailings containing cupriferous and cobaltiferous pyrite dumped within a mountain river valley. This pilot study was conducted to assess the nature... Read More about Population exposure to trace elements in the Kilembe copper mine area, Western Uganda: a pilot study.

Kinetic study of time-dependent fixation of UVI on biochar (2016)
Journal Article

Biochar, a by-product from the production of biofuel and syngas by gasification, was tested as a material for adsorption and fixation of UVI from aqueous solutions. A batch experiment was conducted to study the factors that influence the adsorption a... Read More about Kinetic study of time-dependent fixation of UVI on biochar.

Iodine binding to humic acid (2016)
Journal Article

The rate of reactions between humic acid (HA) and iodide (I-) and iodate (IO3-) have been investigated in suspensions spiked with 129I at concentrations of 22, 44 and 88 µg L-1 and stored at 10oC. Changes in the speciation of 129I-, 129IO3- and mixe... Read More about Iodine binding to humic acid.

Using isotopic dilution to assess chemical extraction of labile Ni, Cu, Zn, Cd and Pb in soils (2016)
Journal Article

Chemical extractants used to measure labile soil metal must ideally select for and solubilise the labile fraction, with minimal solubilisation of non-labile metal. We assessed four extractants (0.43 M HNO3, 0.43 M CH3COOH, 0.05 M Na2H2EDTA and 1 M Ca... Read More about Using isotopic dilution to assess chemical extraction of labile Ni, Cu, Zn, Cd and Pb in soils.

Lability of copper bound to humic acid (2015)
Journal Article

Geochemical speciation models generally include the assumption that all metal bound to humic acid and fulvic acid (HA, FA) is labile. However, in the current study, we determined the presence of a soluble ‘non-labile’ Cu fraction bound to HA extracte... Read More about Lability of copper bound to humic acid.

Selenium in commercial beer and losses in the brewing process from wheat to beer (2015)
Journal Article

Lability of Pb in soil: effects of soil properties and contaminant source (2014)
Journal Article

Environmental Context: There is growing concern that lead (Pb) in the environment may cause adverse health effects in human populations. We investigated the combined use of isotopic abundance and isotopic dilution to show how the origins of soil Pb... Read More about Lability of Pb in soil: effects of soil properties and contaminant source.

Quantification of changes in zero valent iron morphology using X-ray computed tomography (2013)
Journal Article

Morphological changes within the porous architecture of laboratory scale zero valent iron (ZVI) permeable reactive barriers (PRBs), after exposure to different groundwater conditions, have been quantified experimentally for different ZVI/sand ratios... Read More about Quantification of changes in zero valent iron morphology using X-ray computed tomography.

Does returning sites of historic peri-urban waste disposal to vegetable production pose a risk to human health? - A case study near Manchester, UK (2012)
Journal Article

Urban waste disposal occurred on fenland to the west of Manchester, England, between 1900 and 1964. The reclaimed fenland, Chat Moss, is now used for mixed arable farming. A total of 1.92 Mt of waste including privy midden, street sweepings, clinkers... Read More about Does returning sites of historic peri-urban waste disposal to vegetable production pose a risk to human health? - A case study near Manchester, UK.

Iodine dynamics in soils (2011)
Journal Article

We investigated changes in iodine ( 129I) solubility and speciation in nine soils with contrasting properties (pH, Fe/Mn oxides, organic carbon and iodine contents), incubated for nine months at 10 and 20°C. The rate of 129I sorption was greater in s... Read More about Iodine dynamics in soils.

Fractionation of lead in soil by isotopic dilution and sequential extraction (2011)
Journal Article

Environmental contextThe chemical reactivity of lead in soil is difficult to assess and depends on both soil conditions and the origins of the lead. This paper tests the combined application of lead isotopic techniques and chemical extraction against... Read More about Fractionation of lead in soil by isotopic dilution and sequential extraction.

Coordination of Cd2+ ions in the internal pore system of zeolite-X: A combined EXAFS and isotopic exchange study (2009)
Journal Article

The effect of prolonged contact time (up to 130 days) on the immobilization of Cd by sorption to calcium exchanged zeolite-X (CaX), under environmentally relevant conditions, was studied using both isotopic exchange and extended X-ray absorption fine... Read More about Coordination of Cd2+ ions in the internal pore system of zeolite-X: A combined EXAFS and isotopic exchange study.

Quantification of pore clogging characteristics in potential permeable reactive barrier (PRB) substrates using image analysis (2006)
Journal Article

Permeable reactive barriers (PRBs) are now an established approach for groundwater remediation. However, one concern is the deterioration of barrier material performance due to pore clogging. This study sought to quantify the effect of pore clogging... Read More about Quantification of pore clogging characteristics in potential permeable reactive barrier (PRB) substrates using image analysis.

Time-dependent surface reactivity of Cd sorbed on calcite, hydroxylapatite and humic acid (2005)
Journal Article

Time-dependent surface reactivity of Cd sorbed on calcite, hydroxylapatite and humic acid (2005)
Journal Article

Changes in the lability and local environment of Cd sorbed onto calcite, hydroxylapatite and humic acid have been investigated as a function of time (30 min–9 months) using a combination of X-ray adsorption spectroscopy (XAS) and isotopic dilution te... Read More about Time-dependent surface reactivity of Cd sorbed on calcite, hydroxylapatite and humic acid.

Time-dependent surface reactivity of Cd sorbed on calcite, hydroxylapatite and humic acid (2005)
Journal Article

Changes in the lability and local environment of Cd sorbed onto calcite, hydroxylapatite and humic acid have been investigated as a function of time (30 min–9 months) using a combination of X-ray adsorption spectroscopy (XAS) and isotopic dilution te... Read More about Time-dependent surface reactivity of Cd sorbed on calcite, hydroxylapatite and humic acid.