Abstract：
:Jurassic ironstones outcropping over parts of eastern England give rise to soils with arsenic concentrations in excess of the UK soil guideline value of 20 mg kg(-1) for residential areas. Total arsenic concentrations were determined for 73 ironstone derived soils and bioaccessible arsenic determined using an in vitro physiologically based extraction test. The bioaccessible arsenic concentration for these soils was found to be well below the soil guideline value with a mean concentration of 4 mg kg(-1) and a range of 2-17 mg kg(-1). The bioaccessible fraction ranges from 1.2 to 33%. Data from a sequential extraction test based on the use of aqua regia as the main extractant is presented for a subset of 20 of the soils. Chemometric data reduction is used to demonstrate that the bioaccessible arsenic is mainly contained within calcium iron carbonate (sideritic) assemblages and only partially iron aluminosilicates, probably berthierine, and iron oxyhydroxide phases, probably goethite. It is suggested that the bulk of the non-bioaccessible arsenic is bound up with less reactive iron oxide phases.
journal_name
Environ Geochem Healthjournal_title
Environmental geochemistry and healthauthors
Palumbo-Roe B,Cave MR,Klinck BA,Wragg J,Taylor H,O'Donnell KE,Shaw RAdoi
10.1007/s10653-005-0128-1subject
Has Abstractpub_date
2005-04-01 00:00:00pages
121-30issue
2eissn
0269-4042issn
1573-2983journal_volume
27pub_type
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