Oral bioaccessibility of metals in an urban catchment, Newcastle upon Tyne

Abstract

The metal content was determined in soils from a former, historic, contaminated land site and now a 'green' public open space in N.E. England. Using a systematic sampling grid approach, 32 soil samples were taken from locations across the site and analyzed for six potentially toxic elements (Cd, Cr, Cu, Ni, Pb, and Zn). Initially, the pseudo-total metal content of the soils was determined using acid digestion followed by inductively coupled plasma mass spectrometry analysis. This data was evaluated against published soil guideline value (SGV) and generic assessment criteria (GAC) values; it was found that 21% (i.e., 41 samples) exceeded the stated lower values. The data was then compared to the oral bioaccessibility of the soils, which was assessed by an in-vitro gastrointestinal extraction procedure. The results, determined as the % BAF, indicated that overall bioaccessibility was low (<10% BAF) for all the elements studied; the exception was Cd. Given that SGV/GAC values are based on generic land-use categories and not a public open space, as investigated in this work, further work is recommended on developing a qualitative risk assessment at the site to estimate the risks posed to human health via the direct and indirect soil ingestion pathway.

Bioaccessibility of trace elements in soils in Northern Ireland

“…In general, bioaccessible concentrations were higher for the gastric phase extractions, as may be predicted in view of the applied pH regime (Baes and Mesmer, 1986) and as similarly observed by Poggio et al (2009) and Gbefa et al (2011) when investigating contaminated land scenarios.…”

“…These studies have included the assessment of elevated PTE levels due to human activity in the context of contaminated land scenarios ( Okorie et al, 2011;Sialelli et al, 2011;Gbefa et al, 2011;Morillo et al, 2007;Zhang, 2006;Hursthouse, 2001;Meunier et al, 2010) as well as studies investigating the natural geogenous occurrence of elevated PTE concentrations associated with specific soil parent material and soil forming processes (Jordan et al, 2007;Spijker, 2005;Lado et al, 2008;Zhang et al, 2008;Tipping et al, 2006).…”

Bioaccesibilidad de elementos traza en suelos de parques infantiles. Aplicación al análisis de riesgo

“…En las últimas dos décadas se ha incrementado enormemente el interés en las características de los suelos urbanos y se han estudiado los suelos de ciudades por todo el mundo. Algunos ejemplos son Sevilla, España (Madrid et al 2002(Madrid et al , 2004, Madrid (De Miguel et al, 2007), Torino, Italia (Biasioli et al, 2006(Biasioli et al, , 2007, New Orleans, Louisiana, USA (Mielke et al, 1999), Pekín, China (Chen et al, 2005), Gaborone, Bostwana (Zhai et al, 2003), Sydney, Australia (Walter et al, 2005), Newcastle (Gbefa, 2011), Glasgow (Sialelli, 2010) etc. Las propiedades de los suelos urbanos están influenciadas por actividades antropogénicas, y varios tipos de contaminación están presentes en los suelos de las áreas interiores de las ciudades en niveles más altos de los que se encuentran normalmente en las afueras de las ciudades o en las zonas rurales (Biasioli et al, 2006;Mielke et al, 1983) -Por ejemplo, metales, hidrocarburos aromáticos policíclicos (PAHs), componentes organoclorados y radionucleidos.…”