Authors: Cennet Karadaş Derya Kara
Publish Date: 2011/11/12
Volume: 19, Issue: 4, Pages: 1280-1295
Abstract
A chemometric evaluation has been done to classify metal ions in soils and to determine whether or not the gastric and intestinal phases of a physiologically based extraction test bear any relation to any of the phases of the fourstage Community Bureau of Reference BCR extraction protocolNine trace analytes As Ba Cd Cr Cu Mn Ni Pb and Zn were determined in extracts obtained from the BCR sequential extraction procedure as well as from in vitro gastrointestinal experiments The results showed that high As Pb Zn and Cd concentrations were found in these soils Principal component analysis PCA and linear discriminant analysis were used as classification techniques Stepwise multiple linear regression analysis was applied to the data set to determine how the bioaccessibility of a metal is linked to the operationally defined fractions of metal speciation in soilThis analysis showed that the metal concentrations in the intestinal and gastric extracts are mainly dependent on the concentrations found in BCR phases 1 and 2 for each metal ion except for Cr which was mainly dependent on the concentrations found in BCR phase 3 From the chemometric technique of correlation analysis it was concluded that the metals extracted using BCR phases 1 and 2 are more likely to be bioaccessible ie are also extracted by gastric and intestinal digestion solutions When the correlation and PCA results were interpreted together it indicated that the bioaccessiblity of Zn Pb Mn and Cd were higher than As Ba Cr Ni and Cu for these soils
Keywords: