کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1165657 | 1491110 | 2012 | 12 صفحه PDF | دانلود رایگان |
Three mineral acid sequential extraction regimes (HNO3 only, HNO3 followed by HCl and aqua regia) were applied to the NIST 2710 contaminated reference soil. The major and trace element chemical analysis data from the extractions were subjected to a chemometric self-modelling mixture resolution procedure which identified that 12 distinct physico-chemical components were extracted. The fractionation of As, Cd, Ni and Pb between these components were determined. Tentative assignments of the mineralogical sources of the components were made. The human ingestion bioaccessible fraction of As, Cd and Pb were determined using the in vitro BARGE UBM bioaccessibility test and were found to be 51.6%, 68.0% and 68.4% respectively. The relationship between the lability of the physico-chemical components and the bioaccessible fraction of the soils was investigated and the bioaccessible fractions were assigned to specific components. The extraction scheme using aqua regia was found to be the most suitable as it was the only one which extracted the iron sulphide phase in the soil.
Figure optionsDownload as PowerPoint slideHighlights
► Three mineral acid extractions regimes were used.
► Self-modelling mixture resolution identified 12 distinct components.
► The human ingestion bioaccessible As, Cd and Pb fractions were measured.
► The bioaccessible fractions were assigned to specific physico-chemical components.
► The extraction scheme using a mixture of HCl and HNO3 was found to work best.
Journal: Analytica Chimica Acta - Volume 722, 13 April 2012, Pages 43–54