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Type: Artigo de periódico
Title: Employ Of Silica Gel Organically Modified And Ionically Imprinted For Selective On-line Preconcentration Of Copperions [emprego De Sílica Gel Organicamente Modificada E Impressa Iónicamente Para Préconcentração Seletiva On-line De íons Cobre]
Author: De Avila T.C.
Segatelli M.G.
Beijo L.A.
Tarley C.R.T.
Abstract: The present work purposes the preparation of a silica gel sorbent organically modified with 2-aminoethyl-3-aminobutylmethyldimethoxysilane (AAMDMS) and imprinted with Cu2+ ions by means surface imprinting technique and its use for selective on-line sorbent preconcentration of Cu 2+ ions with further UV-VIS spectrophotometric determination by flow injection analysis. The Cu2+-imprinted silica gel, when compared with non imprinted silica gel and silica gel, showed from the biliary mixture of Cu2+/Ni2+ relative selectivity coefficient (k') of 6.84 and 5.43 and 6.64 and 19.83 for the mixture Cu2+/Pb2+, thus demonstrating higher selectivity of Cu2+-imprinted silica gel towards Cu2+ ions. Under optimized, condition, the on-line preconcentration method provided detection limit of 3.4 μg L-1 and linear range ranging from 30.0 up to 300.0 ug L-1 (r = 0.995). The accuracy of method was successfully assessed by analyzing different kind of spiked water samples with, recovery values ranging from 92.2 up to 1.03.0%.
Rights: aberto
Identifier DOI: 
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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