Assessment of oral bioaccessibility of arsenic in playground soil in Madrid (Spain): A three-method comparison and implications for risk assessment

Mingot, J.; Miguel, E. De; Chacón, E.

doi:10.1016/j.chemosphere.2011.05.001

Cited by 41 publications

(14 citation statements)

References 21 publications

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“…As opposed to cations, the behaviour of As seems to be mainly controlled by the Ca content of the soil (Mingot et al 2011). Most of the total load of As in Madrid's samples appears to be bound to carbonate surfaces and maybe also present as Ca As precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…This As is readily dissolved and made bioaccessible in the low-pH gastric extracts, hence the high values of HC1 As and specially SBET As. Organic matter does not contribute significantly to the overall As content in the playground soil of Madrid but the small fraction of As bound to humic substances most likely through Ca bridges is released in the gastric and gastro-intestinal environments (Mingot et al 2011). Conversely, the little As bound to the Fe oxides in Madrid's playgrounds is not released during the gastric extraction, as manifested in the significant, negative partial correlation between all three modes of bioaccessible As and Fe.…”

Section: Resultsmentioning

confidence: 99%

“…RIVM: aqua regia, SBET: aqua regia and HCl:aqua regia) on a sub-set of predictor variables selected from the whole set of soil properties, including concentrations of major elements, using a Bayesian information criterion (BIC) analysis (Mingot et al 2011).…”

Section: Resultsmentioning

confidence: 99%

“…Oomen et al 2003). The present paper follows on from the earlier work of Mingot et al (2011), utilising both the two simplified standard protocols they used to evaluate trace element gastric bioaccessibility and the one which mimics the mouth-gastric-intestinal digestion pathway. Thus, the main aim of this study is an investigation of the influence of selected soil properties on the bioaccessibility of trace elements and hence, their potential impacts on children's health in urban environments.…”

Section: Introductionmentioning

confidence: 99%

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The relationship between soil geochemistry and the bioaccessibility of trace elements in playground soil

Miguel

Mingot

Chacón

et al. 2012

Environ Geochem Health

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A total of 32 samples of surficial soil were collected from 16 playground areas in Madrid (Spain), in order to investigate the importance of the geochemistry of the soil on subsequent bioaccessibility of trace elements. The in vitro bioaccessibility of As, Co, Cr, Cu, Ni, Pb and Zn was evaluated by means of two extraction processes that simulate the gastric environment and one that reproduces a gastric + intestinal digestion sequence. The results of the in vitro bioaccessibility were compared against aqua regia extractions ("total" concentration), and it was found that total concentrations of As, Cu, Pb and Zn were double those of bioaccessible values, whilst that of Cr was ten times higher. Whereas the results of the gastric + intestinal extraction were affected by a high uncertainty, both gastric methods offered very similar and consistent results, with bioaccessibilities following the order:As -Cu -Pb -Zn > Co > Ni > Cr, and ranging from 63 to 7 %. Selected soil properties including pH, organic matter, Fe and CaCC>3 content were determined to assess their influence on trace element bioaccessibility, and it was found that Cu, Pb and Zn were predominantly bound to organic matter and, to a lesser extent, Fe oxides. The former fraction was readily accessible in the gastric solution, whereas Fe oxides seemed to recapture negatively charged chloride complexes of these elements in the gastric solution, lowering their bioaccessibility. The homogeneous pH of the playground soils included in the study does not influence trace element bioaccessibility to any significant extent except for Cr, where the very low gastric accessibility seems to be related to the strongly pH-dependent formation of complexes with organic matter. The results for As, which have been previously described and discussed in detail in Mingot et al. (Chemosphere 84: 1386-1391, indicate a high gastric bioaccessibility for this element as a consequence of its strong association with calcium carbonate and the ease with which these bonds are broken in the gastric solution. The calculation of risk assessments are therefore dependant on the methodology used and the specific environment they address. This has impacts on management strategies formulated to ensure that the most vulnerable of society, children, can live and play without adverse consequences to their health.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The relationship between soil geochemistry and the bioaccessibility of trace elements in playground soil

Miguel

Mingot

Chacón

et al. 2012

Environ Geochem Health

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“…The bioaccessibility and hence bioavailability of any contaminant bound to the soil depends upon the soil type, properties of the soil, particle size, the contaminant and the manner by which the contaminant has entered the soil (Palumbo-Roe et al, 2005;Selinus, 2005;Juhasz et al, 2007a,b;Wragg et al, 2007;Meunier et al, 2011a,b;Mingot et al, 2011). have described how specific properties of soil, such as pH, organic matter content, mineral constituents, solid phase partitioning of As and soil ageing may influence bioaccessibility of As and other contaminants.…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic and geogenic impacts on arsenic bioaccessibility in UK topsoils

Appleton¹,

Cave²,

Wragg³

2012

Science of The Total Environment

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Predictive linear regression (LR) modelling between bioaccessible arsenic (B-As) and a range of total elemental compositions and soil properties was executed in order to assess the potential for developing a national B-As dataset for the UK. LR indicates that total arsenic (As) is the only highly significant independent variable for estimating B-As in urban areas where it explains 75-92% of the variance. The broad compatibility of the London, Glasgow and Swansea regression models suggests that application of these models to estimate bioaccessible As in UK soils impacted by diffuse anthropogenic urban contamination and non-ferrous metal processing should be relatively accurate. In areas dominated by Jurassic ironstones and associated clays and limestones, total As, P and pH are significant, accounting for 53, 14 and 5%, respectively, of the B-As variance. Models based on total As as the sole predictor in the combined Jurassic and Cretaceous sedimentary ironstones datasets explain about 40% of the B-As variance. The median As bioaccessible fraction (%As-BAF) is 19 to 28% in the anthropogenic contamination impacted urban domains, but much lower (5-9%) in geogenic terrains dominated by ironstones. Results of this study can be used as part of a lines of evidence approach to localised risk assessment but should not be used to replace bioaccessibility testing at individual sites where local conditions may vary considerably from the broad overview presented in this study.

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