Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS
| Autor(a) principal: | |
|---|---|
| Data de Publicação: | 2004 |
| Outros Autores: | , |
| Tipo de documento: | Artigo |
| Idioma: | eng |
| Título da fonte: | Repositório Institucional da UFBA |
| Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ri/7202 |
Resumo: | p. 163-175 |
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Tarley, César Ricardo TeixeiraFerreira, Sergio Luis CostaArruda, Marco Aurélio ZezziTarley, César Ricardo TeixeiraFerreira, Sergio Luis CostaArruda, Marco Aurélio Zezzi2012-11-14T12:53:51Z20040026-265Xhttp://www.repositorio.ufba.br/ri/handle/ri/7202v. 77, n. 2p. 163-175The use of rice husks as an alternative adsorbent in an on-line preconcentration system for Cd (II) and Pb (II) determination by flame atomic absorption spectrometry (FAAS) is described. The potential of rice husks as a natural adsorbent was evaluated as a material modified with 0.75 mol l 1 NaOH solution and in the unmodified form. For this task, several techniques such as spectroscopy and thermogravimetry were used for elucidation of possible functional groups responsible for the uptake of Cd (II) and Pb (II). Furthermore, based on adsorption studies and adsorption isotherms applied to the Langmu¨ ir model, it was possible to verify that modified rice husks present a higher adsorption capacity for both metals. After establishing this material as a promising natural adsorbent, it was used for on-line preconcentration of Cd (II) and Pb (II) metals. The multivariate optimisation of chemical and flow variables was performed by using a full factorial design (24) including the following factors: preconcentration time, preconcentration flow rate, concentration and volume of eluent. The optimum pH values used for on-line preconcentration were taken from prior univariate experiments. Under optimised conditions for Cd (II) determination (4 min of preconcentration at a 6 ml min 1 preconcentration flow rate, in which comprises 24 ml of preconcentration volume, 200 Al elution volume and 1.0 mol l 1 HNO3 solution as eluent), the system achieved a detection limit of 1.14 Ag l 1 and an enrichment factor of 72.4. Similar conditions were used for Pb (II) determination (4 min of preconcentration, 6 ml min 1 preconcentration flow rate, 300 Al elution volume and 1.0 mol l 1 HNO3 solution as eluent) from which a detection limit of 14.1 Ag l 1 and enrichment factor of 46.0 were achieved. Also, rice husks have been shown to be a homogeneous and stable adsorbent in which more than 100 preconcentration/elution cycles provide a relative standard deviation (RSD) of less than 6.0% on the analytical signal. The satisfactory accuracy of the method developed was obtained by using spiked water samples (mineral water and lake water) and spiked red wine samples. These values were confirmed by electrothermal atomic absorption spectrometry (ETAAS). The acertified reference material [pig kidney (CRM 186)] and the reference material [beech leaves CRM 100)] were also used.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-11-14T12:53:51Z No. of bitstreams: 1 1-s2.0-S0026265X04000554-main.pdf: 728639 bytes, checksum: 0b72dc75d0b76be9a1520e170f1ec7ba (MD5)Made available in DSpace on 2012-11-14T12:53:51Z (GMT). No. of bitstreams: 1 1-s2.0-S0026265X04000554-main.pdf: 728639 bytes, checksum: 0b72dc75d0b76be9a1520e170f1ec7ba (MD5) Previous issue date: 2004Elsevierhttp://dx.doi.org/10.1016/j.microc.2004.02.019reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBARice husksCharacterisationOn-line preconcentration systemFlame atomic absorption spectrometryUse of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAASMicrochemical Journalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01enginfo:eu-repo/semantics/openAccessORIGINAL1-s2.0-S0026265X04000554-main.pdf1-s2.0-S0026265X04000554-main.pdfapplication/pdf728639https://repositorio.ufba.br/bitstream/ri/7202/1/1-s2.0-S0026265X04000554-main.pdf0b72dc75d0b76be9a1520e170f1ec7baMD51LICENSElicense.txtlicense.txttext/plain1809https://repositorio.ufba.br/bitstream/ri/7202/2/license.txt8bb3e3eb871f5854a9ec419f68651b60MD52TEXT1-s2.0-S0026265X04000554-main.pdf.txt1-s2.0-S0026265X04000554-main.pdf.txtExtracted texttext/plain54039https://repositorio.ufba.br/bitstream/ri/7202/3/1-s2.0-S0026265X04000554-main.pdf.txt8415dde7fd037e138d21f4588efa665aMD53ri/72022022-07-05 14:03:08.708oai:repositorio.ufba.br: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ório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:08Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
| dc.title.pt_BR.fl_str_mv |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| dc.title.alternative.pt_BR.fl_str_mv |
Microchemical Journal |
| title |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| spellingShingle |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS Tarley, César Ricardo Teixeira Rice husks Characterisation On-line preconcentration system Flame atomic absorption spectrometry |
| title_short |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| title_full |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| title_fullStr |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| title_full_unstemmed |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| title_sort |
Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development of an on-line preconcentration system for cadmium and lead determination by FAAS |
| author |
Tarley, César Ricardo Teixeira |
| author_facet |
Tarley, César Ricardo Teixeira Ferreira, Sergio Luis Costa Arruda, Marco Aurélio Zezzi |
| author_role |
author |
| author2 |
Ferreira, Sergio Luis Costa Arruda, Marco Aurélio Zezzi |
| author2_role |
author author |
| dc.contributor.author.fl_str_mv |
Tarley, César Ricardo Teixeira Ferreira, Sergio Luis Costa Arruda, Marco Aurélio Zezzi Tarley, César Ricardo Teixeira Ferreira, Sergio Luis Costa Arruda, Marco Aurélio Zezzi |
| dc.subject.por.fl_str_mv |
Rice husks Characterisation On-line preconcentration system Flame atomic absorption spectrometry |
| topic |
Rice husks Characterisation On-line preconcentration system Flame atomic absorption spectrometry |
| description |
p. 163-175 |
| publishDate |
2004 |
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2004 |
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2012-11-14T12:53:51Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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http://www.repositorio.ufba.br/ri/handle/ri/7202 |
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0026-265X |
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v. 77, n. 2 |
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0026-265X v. 77, n. 2 |
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Elsevier |
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http://dx.doi.org/10.1016/j.microc.2004.02.019 |
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reponame:Repositório Institucional da UFBA instname:Universidade Federal da Bahia (UFBA) instacron:UFBA |
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