1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia


Opción 1: Descargar recurso

Detalles del recurso

Descripción

Three methodologies to assess As bioaccessibility were evaluated using playgroundsoil collected from 16 playgrounds in Madrid, Spain: two (Simplified Bioaccessibility Extraction Test: SBET, and hydrochloric acid-extraction: HCl) assess gastric-only bioaccessibility and the third (Physiologically Based Extraction Test: PBET) evaluates mouth–gastric–intestinal bioaccessibility. Aqua regia-extractable (pseudo total) As contents, which are routinely employed in riskassessments, were used as the reference to establish the following percentages of bioaccessibility: SBET – 63.1; HCl – 51.8; PBET – 41.6, the highest values associated with the gastric-only extractions. For Madridplaygroundsoils – characterised by a very uniform, weakly alkaline pH, and low Fe oxide and organic matter contents – the statistical analysis of the results indicates that, in contrast with other studies, the highest percentage of As in the samples was bound to carbonates and/or present as calcium arsenate. As opposed to the As bound to Fe oxides, this As is readily released in the gastric environment as the carbonate matrix is decomposed and calcium arsenate is dissolved, but some of it is subsequently sequestered in unavailable forms as the pH is raised to 5.5 to mimic intestinal conditions. The HCl extraction can be used as a simple and reliable (i.e. low residual standard error) proxy for the more expensive, time consuming, and error-prone PBET methodology. The HCl method would essentially halve the estimate of carcinogenic risk for children playing in Madridplaygroundsoils, providing a more representative value of associated risk than the pseudo-total concentrations used at present

Pertenece a

Archivo Digital UPM  

Autor(es)

Mingot Marcilla, Juan -  Miguel García, Eduardo de -  Chacón, Enrique - 

Id.: 55568289

Idioma: eng  - 

Versión: 1.0

Estado: Final

Tipo:  application/pdf - 

Palabras claveGeología - 

Tipo de recurso: info:eu-repo/semantics/article  -  Artículo  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: http://creativecommons.org/licenses/by-nc-nd/3.0/es/

Formatos:  application/pdf - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Chemosphere, ISSN 0045-6535, 2011-09, Vol. 84, No. 10
[References] http://oa.upm.es/11355/2/INVE_MEM_2011_104210.pdf
[References] info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemosphere.2011.05.001

Fecha de contribución: 06-sep-2017

Contacto:

Localización:

Otros recursos del mismo autor(es)

  1. Caracterización geoquímica de la línea base de flujo de CO2 en la planta de almacenamiento geológico de Hontomín (Burgos, España) La Fundación Ciudad de la Energía (CIUDEN) está desarrollando un proyecto integral de demostración d...
  2. Baseline of soil CO2 flux in the Hontomin site (Burgos, Spain) Baseline of soil CO2 flux in the Hontomin site (Burgos, Spain)

Otros recursos de la mismacolección

  1. La casa de Dorian Gray. Consideraciones sobre la actuación en Vivienda Moderna Guridi, Rafael: “La casa de Dorian Gray. Consideraciones sobre la actuación en Vivienda Moderna”. En...
  2. Hábitat metropolitano Hábitat metropolitano
  3. Ecología del ambiente artificial Ecología del ambiente artificial
  4. WPS: GeoCoder basado en CartoCiudad y en tecnología OpenSource La geocodificación es el proceso de traducción de direcciones o intersecciones en coordenadas -local...
  5. Effect of integrated fertilization and cover cropping on N2O losses in an irrigated mediterranean maize field Agronomical and environmental benefits are associated with replacing winter fallow by cover crops (C...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.