Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/4257 |
Resumo: | Single sensitive sequential AdSV methods were developed and optimized for the determination of trace zirconium, vanadium, titanium and molybdenum in river, estuary and seawater, independent of the salinity and content of organic matter in the sample. The methods are based on the accumulation of Zr(IV)-and V(V)-cupferron-oxalic acid-1,3-diphenylguanidine complexes and the accumulation of Ti(IV)-and Mo(VI)-mandelic acid at the hanging mercury drop electrode (HMDE). Differential pulse, adsorption potential of -0.6, -0.2, -0.1 and -0.1 V (vs. Ag/AgCl), adsorption time of 400, 20, 120 and 1 s and scan rates of 0.01, 0.06, 0.02 and 0.02 V s-1 for Zr(IV), V(V), Ti(IV) and Mo(VI), respectively, were used as instrumental parameters. The reduction peak for the complexes of Zr(IV), V(V), Ti(IV) and Mo(VI) appeared nearly -0.95, -0.65, -0.85 and -0.4 V, respectively. The variations of the peak current as well as the peak potential of each metal complexes were plotted against the apparent ionic strengths. The proposed voltammetric methods were applied in German and Brazilian rivers and estuaries as well as in seawater from the North Sea collected at the north of Germany and the Atlantic Ocean, collected during scientific cruise between Chile and Germany, as interesting and very simple alternatives to very laborious and time-consuming pre-existent methods, based on outline pre-concentration and separation from the matrix and subject to external contamination. The limits of detection and determination were in the range of ppt-levels and the methods accuracy were evaluated by recoveries tests and by measuring V(V) and Mo(VI) in two NRCC reference materials. Estuarine mixtures experiments were also carried out with the aim to get more insight on the distribution of Ti(IV), Zr(IV), Mo(VI) and V(V) along the estuaries of the rivers Rhine, Weser and Elbe with the North Sea. In this context, natural fresh waters were mixed with seawater at different ratios. |
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Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturaisAdsorptive voltammetry in the determination of traces and ultra-traces of Zr(IV), V(V), Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) in natural watersVoltametria adsortiva de redissoluçãoTitânioZircônioMolibdênioVanádioÁguas naturaisAdsorptive stripping voltammetryZirconiumVanadiumTitaniumMolybdenumNatural watersCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICASingle sensitive sequential AdSV methods were developed and optimized for the determination of trace zirconium, vanadium, titanium and molybdenum in river, estuary and seawater, independent of the salinity and content of organic matter in the sample. The methods are based on the accumulation of Zr(IV)-and V(V)-cupferron-oxalic acid-1,3-diphenylguanidine complexes and the accumulation of Ti(IV)-and Mo(VI)-mandelic acid at the hanging mercury drop electrode (HMDE). Differential pulse, adsorption potential of -0.6, -0.2, -0.1 and -0.1 V (vs. Ag/AgCl), adsorption time of 400, 20, 120 and 1 s and scan rates of 0.01, 0.06, 0.02 and 0.02 V s-1 for Zr(IV), V(V), Ti(IV) and Mo(VI), respectively, were used as instrumental parameters. The reduction peak for the complexes of Zr(IV), V(V), Ti(IV) and Mo(VI) appeared nearly -0.95, -0.65, -0.85 and -0.4 V, respectively. The variations of the peak current as well as the peak potential of each metal complexes were plotted against the apparent ionic strengths. The proposed voltammetric methods were applied in German and Brazilian rivers and estuaries as well as in seawater from the North Sea collected at the north of Germany and the Atlantic Ocean, collected during scientific cruise between Chile and Germany, as interesting and very simple alternatives to very laborious and time-consuming pre-existent methods, based on outline pre-concentration and separation from the matrix and subject to external contamination. The limits of detection and determination were in the range of ppt-levels and the methods accuracy were evaluated by recoveries tests and by measuring V(V) and Mo(VI) in two NRCC reference materials. Estuarine mixtures experiments were also carried out with the aim to get more insight on the distribution of Ti(IV), Zr(IV), Mo(VI) and V(V) along the estuaries of the rivers Rhine, Weser and Elbe with the North Sea. In this context, natural fresh waters were mixed with seawater at different ratios.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMétodos sensíveis e sequenciais de voltametria adsortiva de redissolução foram desenvolvidos e otimizados para a determinação de traços e ultra-traços de zircônio, vanádio, titânio e molibdênio em águas de rio, estuário e mar, independentemente da salinidade e conteúdo de matéria orgânica na amostra. Os métodos são baseados na acumulação de complexos de Zr(IV) e V(V) com cupferron-ácido oxálico-1,3-difenilguanidina e de complexos de Ti(IV) e Mo(VI) com ácido mandélico no eletrodo de mercúrio de gota pendente (HMDE). Pulso diferencial, potenciais de adsorção de -0,6; -0,2; -0,1 e -0,1 V (vs Ag/AgCl), tempos de adsorção de 400, 20, 120 e 1 s e velocidades de varredura de 0,01; 0,06; 0,02 e 0,02 V s-1, para Zr(IV), V(V), Ti(IV) e Mo(VI), respectivamente, foram usados como parâmetros instrumentais. Os picos de redução para os complexos de Zr(IV), V(V), Ti(IV) e Mo(VI) surgiram próximos de -0,95; -0,65; -0,85 e -0,4 V, respectivamente. As variações de corrente de pico assim como de potencial de pico de cada complexo dos metais foram plotados contra as forças-iônicas aparentes das amostras. Os métodos voltamétricos propostos foram aplicados em águas de rio e estuário coletadas na Alemanha e no Brasil e em amostras de água do mar do Mar do Norte coletadas no norte da Alemanha e Oceano Atlântico, coletadas durante expedição científica entre o Chile e Alemanha. Estes métodos se mostraram ser alternativas simples a métodos bastante complexos e demorados, baseados em pré-concentração outline e separação da matriz, sujeitos a contaminação externa. Os limites de detecção e quantificação estavam na ordem de partes por trilhão e a exatidão dos métodos foi avaliada através de teste de recuperação de amostras adicionadas com os analitos em estudo e em 2 materiais de referência certificados. Também foram realizados experimentos de mistura estuarina com o objetivo de obter informações da distribuição de Ti(IV), Zr(IV), Mo(VI) e V(V) ao longo de estuários dos rios Reno, Weser e Elba com o Mar do Norte. Neste intuito, as águas dos rios e do mar foram misturadas em diferentes razões.Universidade Federal de Santa MariaBRQuímicaUFSMPrograma de Pós-Graduação em QuímicaNascimento, Paulo Cícero dohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788664D2Bento, Douglas Mayerhttp://lattes.cnpq.br/5088031873732562Stülp, Simonehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799529Y9Rosa, Marcelo Barcellos dahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792062P5Nascimento, Denise Bohrer dohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798557Z7Schneider, Alexandre Batista2017-05-102017-05-102014-03-13info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfSCHNEIDER, Alexandre Batista. Adsorptive voltammetry in the determination of traces and ultra-traces of Zr(IV), V(V), Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) in natural waters. 2014. 148 f. Tese (Doutorado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2014.http://repositorio.ufsm.br/handle/1/4257porinfo:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2018-01-26T04:27:20Zoai:repositorio.ufsm.br:1/4257Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2018-01-26T04:27:20Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais Adsorptive voltammetry in the determination of traces and ultra-traces of Zr(IV), V(V), Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) in natural waters |
title |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
spellingShingle |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais Schneider, Alexandre Batista Voltametria adsortiva de redissolução Titânio Zircônio Molibdênio Vanádio Águas naturais Adsorptive stripping voltammetry Zirconium Vanadium Titanium Molybdenum Natural waters CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
title_full |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
title_fullStr |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
title_full_unstemmed |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
title_sort |
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais |
author |
Schneider, Alexandre Batista |
author_facet |
Schneider, Alexandre Batista |
author_role |
author |
dc.contributor.none.fl_str_mv |
Nascimento, Paulo Cícero do http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788664D2 Bento, Douglas Mayer http://lattes.cnpq.br/5088031873732562 Stülp, Simone http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799529Y9 Rosa, Marcelo Barcellos da http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792062P5 Nascimento, Denise Bohrer do http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798557Z7 |
dc.contributor.author.fl_str_mv |
Schneider, Alexandre Batista |
dc.subject.por.fl_str_mv |
Voltametria adsortiva de redissolução Titânio Zircônio Molibdênio Vanádio Águas naturais Adsorptive stripping voltammetry Zirconium Vanadium Titanium Molybdenum Natural waters CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
topic |
Voltametria adsortiva de redissolução Titânio Zircônio Molibdênio Vanádio Águas naturais Adsorptive stripping voltammetry Zirconium Vanadium Titanium Molybdenum Natural waters CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
Single sensitive sequential AdSV methods were developed and optimized for the determination of trace zirconium, vanadium, titanium and molybdenum in river, estuary and seawater, independent of the salinity and content of organic matter in the sample. The methods are based on the accumulation of Zr(IV)-and V(V)-cupferron-oxalic acid-1,3-diphenylguanidine complexes and the accumulation of Ti(IV)-and Mo(VI)-mandelic acid at the hanging mercury drop electrode (HMDE). Differential pulse, adsorption potential of -0.6, -0.2, -0.1 and -0.1 V (vs. Ag/AgCl), adsorption time of 400, 20, 120 and 1 s and scan rates of 0.01, 0.06, 0.02 and 0.02 V s-1 for Zr(IV), V(V), Ti(IV) and Mo(VI), respectively, were used as instrumental parameters. The reduction peak for the complexes of Zr(IV), V(V), Ti(IV) and Mo(VI) appeared nearly -0.95, -0.65, -0.85 and -0.4 V, respectively. The variations of the peak current as well as the peak potential of each metal complexes were plotted against the apparent ionic strengths. The proposed voltammetric methods were applied in German and Brazilian rivers and estuaries as well as in seawater from the North Sea collected at the north of Germany and the Atlantic Ocean, collected during scientific cruise between Chile and Germany, as interesting and very simple alternatives to very laborious and time-consuming pre-existent methods, based on outline pre-concentration and separation from the matrix and subject to external contamination. The limits of detection and determination were in the range of ppt-levels and the methods accuracy were evaluated by recoveries tests and by measuring V(V) and Mo(VI) in two NRCC reference materials. Estuarine mixtures experiments were also carried out with the aim to get more insight on the distribution of Ti(IV), Zr(IV), Mo(VI) and V(V) along the estuaries of the rivers Rhine, Weser and Elbe with the North Sea. In this context, natural fresh waters were mixed with seawater at different ratios. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-03-13 2017-05-10 2017-05-10 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
SCHNEIDER, Alexandre Batista. Adsorptive voltammetry in the determination of traces and ultra-traces of Zr(IV), V(V), Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) in natural waters. 2014. 148 f. Tese (Doutorado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/4257 |
identifier_str_mv |
SCHNEIDER, Alexandre Batista. Adsorptive voltammetry in the determination of traces and ultra-traces of Zr(IV), V(V), Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) in natural waters. 2014. 148 f. Tese (Doutorado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2014. |
url |
http://repositorio.ufsm.br/handle/1/4257 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Química UFSM Programa de Pós-Graduação em Química |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Química UFSM Programa de Pós-Graduação em Química |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1805922099745783808 |