Effects of Contaminant Concentration, Aging, and Soil Properties on the Bioaccessibility of Cr(III) and Cr(VI) in Soil

Stewart, Melanie; Jardine, Philip M.; Brandt, Craig C.; Barnett, Mark O.; Fendorf, S. E.; McKay, Larry D.; Mehlhorn, Tonia L.; Paul, Keryn I.

doi:10.1080/713610958

Cited by 63 publications

(38 citation statements)

References 36 publications

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“…This may reflect the varying relative abundance of different PTE species with specific bioaccessibility fractions as documented for example by Stewart et al (2003) for Cr-III/Cr-VI bioaccessibilities.…”

Section: Discussionmentioning

confidence: 99%

Bioaccessibility of trace elements in soils in Northern Ireland

Barsby

McKinley

Ofterdinger

et al. 2012

Science of The Total Environment

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Section: Discussionmentioning

confidence: 99%

Bioaccessibility of trace elements in soils in Northern Ireland

Barsby

McKinley

Ofterdinger

et al. 2012

Science of The Total Environment

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“…Cr(VI) persists in soils because of sorption to soil particles, which increases the potential risk of human exposure [6]. Because of the high accumulation of metals in roots and leaves, plants growing on metalcontaminated sites are not suitable for consumption by animals or humans [7].…”

Section: Introduction *mentioning

confidence: 99%

Bioremediation of chromium(VI) contaminated soil by Streptomyces sp. MC1

Polti

García

Amoroso

et al. 2009

J. Basic Microbiol.

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This work provides quantitative information on Cr(VI) reduction in soil samples by an indigenous actinomycete. Streptomyces sp. MC1, previously isolated from sugarcane, has shown ability to reduce Cr(VI) in liquid minimal medium. A reduction of 100 and 75% was obtained at initial Cr(VI) concentrations of 5 and 50 mg l(-1), respectively, after 48 h of incubation. Bioremediation ability of Streptomyces sp. MC1 was assayed in soil extracts and soil samples. Relative growth of Streptomyces sp. MC1 was 77 and 38% when grown in soil extract with 10 and 50 mg l(-1) of Cr(VI), respectively. MC1 was able to reduce 30% of Cr(VI) after 96 h of incubation with 10 mg l(-1) of Cr(VI), and reduction coincided with the exponential growth phase at pH 7 and 30 degrees C.In soil samples, Streptomyces sp. MC1 was able to reduce up to 94% of the Cr(VI) bioavailability (50 mg kg(-1)) after 7 d. These results were compared with non-inoculated soil samples with Cr(VI). Bioremediation activity of Streptomyces sp. MC1 was not inhibited by natural soil microbial flora. Besides, Streptomyces sp. MC1 growth was not inhibited by 50 mg kg(-1) of Cr(VI). In contrast to findings obtained by other authors, our results showed almost complete Cr(VI) removal from soil without any previous treatment, and without addition of any substrate and with a normal soil humidity level. These results confirm the Cr(VI)-contaminated soil bioremediation potential of Streptomyces sp. MC1.

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“…As a result, initial studies investigating the bioaccessibility of Cr, were concerned mostly with soil contamination due to the use of chromated copper-arsenate (CCA) (Stewart et al 2003;Nico et al 2006). More recently as understanding of As and Pb has developed, attention has shifted to other inorganic contaminants, including Ni and Cr.…”

Section: Introductionmentioning

confidence: 99%

The importance of solid-phase distribution on the oral bioaccessibility of Ni and Cr in soils overlying Palaeogene basalt lavas, Northern Ireland

Cox

Chelliah

McKinley

et al. 2013

Environ Geochem Health

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Potentially toxic elements (PTEs) including nickel and chromium are often present in soils overlying basalt at concentrations above regulatory guidance values due to the presence of these elements in underlying geology. Oral bioaccessibility testing allows the risk posed by PTEs to human health to be assessed, however bioaccessibility is controlled by factors including mineralogy, particle size, solid phase speciation and encapsulation. X-ray diffraction (XRD) was used to characterise the mineralogy of 12 soil samples overlying Palaeogene basalt lavas in Northern Ireland and non specific sequential extraction coupled with chemometric analysis was used to determine the distribution of elements amongst soil components in 3 of these samples. The data obtained were related to total concentration and oral bioaccessible concentration to determine whether a relationship exists between the overall concentrations of PTEs, their bioaccessibility and the soils mineralogy and geochemistry.Gastric phase bioaccessible fraction (BAF%) ranged from 0.4% to 5.4% for chromium in soils overlying basalt and bioaccessible and total chromium concentrations are positively correlated. In contrast the range of gastric phase BAF for nickel was greater (1.4 to 43.8%), while no significant correlation was observed between bioaccessible and total nickel concentrations. However nickel BAF was inversely correlated with total concentration. Solid phase fractionation information showed that bioaccessible nickel was associated with calcium carbonate, aluminum oxide, iron oxide and clay related components, while bioaccessible chromium was associated with clay related components. This suggests that weathering significantly affects nickel bioaccessibility, but does not have the same effect on the bioaccessibility of chromium. Suggested keywordsoral bioaccessibility, nickel, chromium, basalt, sequential extraction, solid phase distribution 3

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Effects of Contaminant Concentration, Aging, and Soil Properties on the Bioaccessibility of Cr(III) and Cr(VI) in Soil

Cited by 63 publications

References 36 publications

Bioaccessibility of trace elements in soils in Northern Ireland

Bioaccessibility of trace elements in soils in Northern Ireland

Bioremediation of chromium(VI) contaminated soil by Streptomyces sp. MC1

The importance of solid-phase distribution on the oral bioaccessibility of Ni and Cr in soils overlying Palaeogene basalt lavas, Northern Ireland

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