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Analysis of kaolin by sedimentation field-flow fractionation and electrothermal atomic absorption spectrometry detection

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Summary

Electrothermal (graphite furnace) atomic absorption spectrometry (ETAAS), as off-line detector for sedimentation field-flow fractionation (SedFFF) is exploited in clay analysis.

Quantitation limits of coupled SedFFF-ETAAS for the determination of a submicron kaolin sample, considered a representative model of natural water suspended particulate, are theoretically established and experimentally validated with reference to Al and Si determination by ETAAS.

Complete sample recovery for a 4 µg injected kaolin sample was obtained by keeping adsorption in the SedFFF apparatus to a minimum under control. The best experimental conditions, ensuring sample integrity, were low ionic strength (Na2CO3, 10−5 M), pH 8 and a Teflon covered accumulation wall. Several different runs, revealing the various experimental parameters affecting quantitative recovery, are reported and the different physico-chemical processes affecting such recovery are discussed. The advantages and drawbacks of SedFFF-ETAAS coupling compared with inductively coupled plasma-mass spectrometry (ICP-MS) technique are also discussed.

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Authors and Affiliations

  1. Department of Chemistry, University of Ferrara, Via L. Borsari 46, 44100, Ferrara, Italy

    G. Blo, C. Contado, F. Fagioli & F. Dondi

  2. Department of Analytical Chemistry, Faculty of Chemistry, 15706, Santiago de Compostela, Spain

    M. H. Bollain Rodriguez

Authors
  1. G. Blo
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  2. C. Contado
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  3. F. Fagioli
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  4. M. H. Bollain Rodriguez
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  5. F. Dondi
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Blo, G., Contado, C., Fagioli, F. et al. Analysis of kaolin by sedimentation field-flow fractionation and electrothermal atomic absorption spectrometry detection. Chromatographia 41, 715–721 (1995). https://doi.org/10.1007/BF02688113

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  • DOI: https://doi.org/10.1007/BF02688113

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