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- W2079787124 abstract "Abstract The potential of using dried algae as a novel preconcentration technique for the analysis of water samples by PIXE was examined. The algae cells were found to contain significant levels of P and S, indicative of phosphorous- and sulfur-containing groups on the cell wall or inside the algae cells which may serve as potential binding sites for metal ions. When C. vulgaris was used on mixed metal solutions, linear responses were observed for Ag+, Ba2+, and Cd2+ in the concentration range from 10 ng/g to 1 μg/g; for Cu2+ and Pb2+ from 10 ng/g to 5 μg/g; and for Hg2+ from 10 ng/g to 10 μg/g. When S. bacillaris was used, linear responses were observed from 10 ng/g up to 10 μg/g for all of the metal cations investigated. The PIXE results demonstrated that metal binding at low concentrations involves replacement of sodium on the cell wall and that at high concentrations magnesium was also replaced. Competitive binding studies indicate that the metal ions, Ag+, Ba2+, Cd2+, Cu2+, and Pb2+, share common binding sites with binding efficiencies varying in the sequence of Pb2+ > Cu2+ > Ag2+ > Cd2+ > Ba2+. The binding of Hg2+ involved a different binding site with an increase in binding efficiency in the presence of Ag+." @default.
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- W2079787124 date "1995-05-01" @default.
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- W2079787124 title "A novel preconcentration technique for the PIXE analysis of water" @default.
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- W2079787124 doi "https://doi.org/10.1016/0168-583x(94)00694-6" @default.
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