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Type: Artigo de periódico
Title: Use And Recycling Of Silica Gel Impregnated With Silver Nitrate [utilização E Recuperação De Sílica Gel Impregnada Com Nitrato De Prata]
Author: Andreao P.S.S.
Giacomini R.A.
Stumbo A.M.
Waldman W.R.
Braz filho R.
Ligiero C.B.P.
Miranda P.C.M.L.
Abstract: Argentation chromatography is used to increase the selectivity of the chromatographic process, chiefly in the resolution of complex mixtures of nonpolar substances. Although efficient, this technique generates residues containing heavy metal which makes its discarding through common procedures impracticable. In the present work a simple method for recycling of silica, and also silver, from argentation chromatography is described. This procedure uses initially a treatment of H2O2/HNO3, with subsequent treatment with H2O2/H2SO4, allowing an efficient recycling of both components. This methodology is simple, costless, removes impurities efficiently, and does not modify retention parameters nor specific surface in a significant way.
Rights: aberto
Identifier DOI: 
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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