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Dissertations / Theses on the topic 'Potentiometry'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Smith, K. "Liquid junction effects in potentiometry." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381526.

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2

Richards, Timothy James. "Internal potentiometry of polymer field effect transistors." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613272.

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3

David, Parra Diego Noé [UNESP]. "Estudo da dopagem no óxido de manganês tipo espinélio nanoestruturado no desempenho de um sensor potenciométrico para íons lítio." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/97769.

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Made available in DSpace on 2014-06-11T19:29:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-05-11Bitstream added on 2014-06-13T20:18:53Z : No. of bitstreams: 1 davidparra_dn_me_sjrp.pdf: 1063590 bytes, checksum: b725dfdebce47d644726e872ef4e99d1 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>No presente trabalho estudo0se o desempenho eletroquímico de sensores a base de óxido de manganês (IV) do tipo espinélio dopado, para determinação potenciométrica de íons lítio. A matriz porosa de óxido de manganês é formada por unidades de blocos de MnO6 octaéd

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4

Danish, Ekram Yousif. "Determination of ionized magnesium with ion-selective electrodes." Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/833.

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The role of magnesium is acknowledged in human physiology even though it is incompletely understood,a nd measuremenot f ionized magnesium by ion-selective electrode analysers is becoming commoner as recent research has alerted clinicians to its importance. Standardisation of ionized magnesium in blood samples in the form of a reference method is required. A prototype reference cell, which was developed for the reference method for ionized calcium, has been tested and found to perform well for magnesium. Selectivity coefficients, and the effects of pH and of proteins on various magnesium select

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5

Pereira, Angelo W. D. "A floating-gate delta-sigma modulator." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180136/unrestricted/pereira%5Fangelo%5Fw%5F200312%5Fms.pdf.

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6

David, Parra Diego Noé. "Estudo da dopagem no óxido de manganês tipo espinélio nanoestruturado no desempenho de um sensor potenciométrico para íons lítio /." São José do Rio Preto : [s.n.], 2012. http://hdl.handle.net/11449/97769.

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Orientador: Marcos Fernando de Souza Teixeira<br>Banca: Silvio Rainho Teixeira<br>Banca: Éder Tadeu Gomes Cavalheiro<br>Resumo: No presente trabalho estudo0se o desempenho eletroquímico de sensores a base de óxido de manganês (IV) do tipo espinélio dopado, para determinação potenciométrica de íons lítio. A matriz porosa de óxido de manganês é formada por unidades de blocos de MnO6 octaédricos que podem formar diferentes estruturas cristalinas. O óxido de manganês tipo espinélio apresenta uma estrutura tridimensional com túneis estruturais próprios e adequados para a inserção do íon lítio. Entr

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7

O'Connell, Gregory Raymond. "Detector cell hydrodynamics and electrode selectivity in flow-injection potentiometry." Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290935.

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8

Sabri, Shadi Saleem. "Surface potentiometry with graphene field effect transistors for sensing applications." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121120.

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In this thesis, we establish the foundations on which graphene based chemical sensors can be developed. Graphene combines several ideal characteristics for potentiometry and charge probing at surfaces which are essential for chemical sensing applications. Hitherto, graphene/substrate interactions have masked the response of graphene based chemical sensors. We demonstrate the use of hydrophobic polymers as a substrate for graphene field effect transistors (FETs) as a means to eliminate undesired graphene/substrate interactions. Parylene gated devices exhibit stable neutrality point gate voltage

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9

Wong, Lai Chun Caleb. "A study of multichannel open circuit potentiometry in biosensor applications." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761002.

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The specificity of biosensors is achieved by the use of biological probes with affinity to the targets to be detected. The electrochemical transducer converts the biological recognition process into an electrical signal. The resulting electrical signal is the response of the recognition from the biolayer. Potentiometric, amperometric and voltammetric detection are the fundamental electrochemical measurement techniques. In this thesis, direct open circuit potentiometry (OCP) is studied with several types of electrochemical systems. The biological interaction between the probes and the targets a

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10

FELIX, GISELE R. "Implantacao da tecnica potenciometrica para medidas in situ da solubilidade de oxidos em meio de sais fundidos .Eletrodos indicados de zirconia estabilizada." reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10482.

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11

Koort, Eve. "Uncertainty estimation of potentiometrically measured pH and pK[subscript a] values /." Online version, 2006. http://dspace.utlib.ee/dspace/bitstream/10062/599/5/koorteve.pdf.

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12

Sahara, Emmy. "Stripping potentiometric determination of trace metals in environmental materials /." View thesis, 1996. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030822.171402/index.html.

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13

Sahara, Emmy. "Stripping potentiometric determination of trace metals in environmental materials." Thesis, View thesis, 1996. http://handle.uws.edu.au:8081/1959.7/29143.

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This thesis describes the development and application of stripping potentiometric methods for reliable determination of some trace metals in natural waters on a glassy carbon mercury film electrode (GCMFE). The development of these methods involved investigation of factors influencing the stripping potentiometric measurement, such as selection of adequate supporting electrolyte, choice of pH and/or concentration of supporting electrolyte, oxidant concentration, deposition potential, deposition time, stirring or sample rotation rate and equilibrium period. Moreover, the influence of complexing

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14

Duquette, Martin. "Surface charge evaluation of soils, clays and oxides." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39270.

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Two objectives are achieved in this thesis: (1) to develop a new method to measure the pH-dependent net surface charge of soils and (2) to determine if, by a combination of the surface charge evaluated by potentiometric titration and ion adsorption, we can separate the permanent charge, generated by the isomorphous substitution, from the variable charge. First, a laboratory procedure, using backtitration, was developed for the measurement of the pH-dependent net surface charge. This method was tested on ten soil horizons from Gleysols and Podzols. It appears that the pH-dependent net surface c

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15

Kelly, Patricia McGilvray. "Proposed reference method for the measurement of ionized calcium in blood." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332246.

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16

Holo, Luxolo. "Enantioselective, potentiometric membrane electrodes for enantioanalysis of amino acids of clinical and pharmaceutical importance." Diss., Pretoria: [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-03082010-172629/.

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17

Rossi, Maura Vincenza. "Método alternativo para a determinação complexométrica de magnésio. Influência do volume nas titulações potenciométricas." Universidade de São Paulo, 1986. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-10092018-153423/.

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No presente trabalho comprova-se o efeito prejudicial do oxalato, utilizado para a separação prévia de cálcio e magnésio, na determinação complexométrica deste último com EDTA em águas, usando-se em titulação visual o indicador Negro de Eriocromo T e, em titulação potenciométrica, o sistema indicador Hg/Hg-EDTA. Comprovou-se, também, a viabilidade de se usar como titulante uma solução de EDTA \"tetraneutralizado\", em titulações potenciométricas com medidas de pH através de eletrodo de vidro combinado. Neste caso o ponto final é obtido através da hidrólise da espécie Y4-, após o ponto de equiv

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18

Манжос, Олексій Павлович, Алексей Павлович Манжос, Oleksii Pavlovych Manzhos та И. А. Рой. "Применение анионселективных злектродов для анализа природных вод и степени разложения хлорорганических пестицидов". Thesis, Издательство СумГУ, 2007. http://essuir.sumdu.edu.ua/handle/123456789/19010.

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Разработана методика определения степени дехлорирования пестицидов в почве и воде. Она заключается в том, что после инкубирования образцов с пестицидом сравнивают содержание хлор-ионов в опыте и контроле. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/19010

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19

Stevens, Anthony Clark 1960. "CHARACTERIZATION OF ION-SELECTIVE ELECTRODES BY ELECTROCHEMICAL STUDIES OF ION TRANSFER AT THE LIQUID/LIQUID INTERFACE." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276364.

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20

Tasana, Nomalanga Gloria. "Optimisation and evaluation of boron analysis for pressurized Water reactor plants." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2328.

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Thesis (MTech (Chemistry))--Cape Peninsula University of Technology, 2016.<br>Boron concentration analysis is an important and critical analysis performed by the Analytical Chemistry Laboratory at Koeberg Nuclear Power Station (KNPS), because boron controls reactivity and the concentration determination is a Technical Specification Parameter (safety parameter). Hence accurate, precise results for boron concentration produced by laboratories and on-line analysers are important because of their operational implications associated with reactivity control and also for nuclear safety. T

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21

Bertotti, Mauro. "Estudos potenciométricos sobre a formção de complexos entre índio (III) e azoteto, em meio aquoso." Universidade de São Paulo, 1986. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-16052008-092501/.

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O presente estudo procura dar continuidade a um dos ramos de pesquisa desenvolvidos na área de Analítica do Instituto de Química da USP, onde se procura estudar a química de complexos formados entre diferentes metais e o ânion azoteto, N-3. O cátion índio(III), à semelhança do que ocorre com o ferro (III), complexa com o ânion azoteto em meio aquoso. Este poder de complexação foi constatado em estudos polarográficos do sistema In N3+ / N-3 ora em desenvolvimento. A obtenção das constantes de estabilidade dos complexos formados entre o In3+ e o ligante azoteto, por via potenciométrica, baseia-

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22

Lüpke, Felix [Verfasser], Bert [Akademischer Betreuer] Voigtländer, and Markus [Akademischer Betreuer] Morgenstern. "Scanning tunneling potentiometry at nanoscale defects in thin films / Felix Lüpke ; Bert Voigtländer, Markus Morgenstern." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1162629592/34.

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23

Rozler, Michael. "Development of a scanning tunneling potentiometry system for measurement of electronic transport at short length scales /." May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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24

Lima, Arlesson Freire de. "Determinação de lansoprazol em cápsulas utilizando metodologia baseada em imagens digitais." Universidade Federal do Amazonas, 2015. http://tede.ufam.edu.br/handle/tede/4736.

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25

Holo, Luxolo. "Enantioselective, potentiometric membrane electrodes for enantioanalysis of amino acids of clinical and pharmaceutical importance /." [S.l. : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-03082010-172629/.

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26

Crespo, Paravano Gastón Adrián. "Solid contact ion selective electrodes based on carbon nanotubes." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9050.

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The aim of this thesis is the development of solid contact ion selective electrodes, ISEs, where the transducer layer is made of a network of carbon nanotubes.<br/><br/>Potentiometric classical ion selective electrodes (ISEs) have been used for analytical applications since the beginning of 1900's. Determination of pH by a glass membrane ion selective electrode emerged at the beginning, being the first ISEs developed. pH glass electrode is still one the most useful and robust sensors for routine measurements both in laboratories and industries.<br/><br/>Throughout the years, new technologies,

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27

Toresson, Caroline. "Påverkan på blodgassprutor som transporterats i rörtransportsystemet MC-2000." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85818.

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Blodgassprutor beställs för att undersöka en patients syra-bas-status, laktatkoncentration och elektrolytkoncentration. Några orsaker till balansrubbningar kan vara trauma, syrebrist, infektion, intoxikation eller svält. År 2018 installerades ett nytt rörtransportsystem på Västerviks sjukhus och syftet med studien var att undersöka om det är möjligt att transportera blodgassprutor i det nya rörsystemet utan att provresultat påverkas. Analyser som studerades var pH (power of hydrogen), syretryck, koldioxidtryck, syrgasmättnad, natriumjoner, kaliumjoner, fria kalciumjoner, standardbikarbonat, ba

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28

Freeman, Christopher J. "Biosensing and Catalysis Applications of Nanoporous Gold (NPG) and Platinum-Speckled Nanoporous Gold (NPG-Pt) Electrodes." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5473.

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The importance of porous materials has risen substantially in the last few decades due to their ability to reduce the size and cost of bioanalytical devices and fuel cells. First, this work aims to describe the fabrication of nanoporous gold (NPG) electrodes that are resistant to electrode passivation due to fibrinogen biofouling in redox solutions. The effect on potentiometric and voltammetric experiments was seen as a deviation from ideal behavior on planar gold electrodes, whereas NPG electrodes were consistently behaving in a Nernstian fashion at low concentrations of ferri-ferrocyanide (£

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29

Jardim, Wolney de Jesus. "Construção e avaliação de eletrodos de Nióbio/Óxido de Nióbio para determinações potenciométricas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/97/97136/tde-22082013-104314/.

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A construção de sensor potenciométrico, utilizando Nióbio acoplado a eletrodo de referência de prata/cloreto de prata num mesmo instrumento, possibilita o acompanhamento da variação de potencial que ocorre durante uma reação ácido-base em meio aquoso. Foi utilizado eletrodo de vidro combinado, cuja membrana de vidro foi danificada fisicamente, porém com sua referência interna em pleno funcionamento. O eletrodo de Nióbio foi confeccionado com metal polido ou então com a superfície modificada com óxido eletrodepositado. O crescimento de óxido sobre o Nióbio foi obtido por eletrólise em meio a H3

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30

Guo, Xuefei. "Development of Electrochemical Sensors for Biodegradable Metallic Implants and Development of a Label-free Biosensor for Bacteria." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342106824.

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31

Novell, Recasens Marta. "Paper-based potentiometric platforms for decentralised chemical analysis." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/313994.

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En les darreres dècades, el món ha experimentat profunds canvis socials i tecnològics. Entre aquests, són destacables les tendències emergents d’anàlisis descentralitzats i de xarxes de sensors, que estan tenint un gran impacte en moltes àrees, especialment en el sistema sanitari. El desenvolupament d’eines per a realitzar anàlisis fora del laboratori de forma robusta, simple i econòmica, serà de gran ajuda per generar, per exemple, eines de diagnòstic assequibles. Per complementar aquestes tendències, aquesta tesis presenta el desenvolupament d’una eina analítica nova per anàlisis descentrali

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32

Messadi, Ahmed. "Synthèse de ligands et liquides ioniques dérivés de molécules naturelles : Application à la complexation des cations métalliques - Application à l’extraction liquide-liquide de métaux." Thesis, Reims, 2013. http://www.theses.fr/2013REIMS002/document.

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Ces travaux abordent, d'une part l'étude de la coordination du cuivre(II) et nickel(II) avec un ligand heptadenté tripode, et d'autre part la synthèse et la caractérisation de liquides ioniques dérivés de la bétaïne.Tout d'abord, le ligand heptadenté, le tris[(L)-alanyl-2-carboxamidoéthyl]amine (H3trenala), a été synthétisé sous forme de sel de chlorure ; ses constantes de protonation ainsi que les constantes de stabilité des complexes de Cu(II) et de Ni(II) ont été déterminées par potentiométrie. Des espèces complexes mononucléaires dans lesquels le ligand est protonné ([Cu(H5trenala)]4+, [M(

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33

Calvo, López Antonio. "Diseño, construcción y evaluación de analizadores miniaturizados para su aplicación aeroespacial, medioambiental, alimentaria, biomédica e industrial." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/458561.

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La gran demanda de información en tiempo real, in situ y de calidad, para llevar a cabo el control y la monitorización de múltiples parámetros (bio)químicos en ámbitos como el aeroespacial, medioambiental, industrial, alimentario o biomédico, ha fomentado en los últimos años el desarrollo de instrumentación analítica con un alto nivel de integración, miniaturización y automatización. De esta manera, han aparecido los denominados microsistemas de análisis total (µTAS) o Lab-on-a-Chip (LOC). Así, el trabajo realizado en esta tesis tiene como objetivo principal el desarrollo de microanalizadores

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34

Santos, Fabrício Aparecido dos. "Processamento de grafeno oxidado na forma de filmes ultrafinos e aplicações em sensores." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14042015-090739/.

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Dentre as formas alotrópicas do carbono, o grafeno merece destaque. Este material consiste de uma monocamada atômica de carbono sp2 disposta em uma rede bidimensional cristalina hexagonal tipo favo de mel. Uma das formas de se obter o grafeno é pela esfoliação química, que consiste da oxigenação do grafite policristalino em um ambiente altamente oxigenado, formando um produto intermediário chamado de grafeno oxidado (GO). Por este método, gera-se um produto altamente estável e solúvel em água, podendo ser utilizado na construção de filmes ultrafinos. Uma das aplicações possíveis do grafeno oxi

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35

Zelada, Guillén Gustavo Adolfo. "Ultrasensitive detection of pathogens in real-time. Potentiometric biosensors based on single-walled carbon nanotubes and aptamers." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/51768.

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Un gran nombre de plataformes de detecció biològica han incorporat materials nanoestructurats com una estratègia per a millorar diversos paràmetres operacionals i de qualitat tals com reduir els temps d'anàlisis i els límits de detecció. Les tècniques electroquímiques de detecció es prefereixen sobre altres tècniques ja que presenten una sèrie d'avantatges com a rapidesa, facilitat de maneig, cost reduït i la reduïda mida dels detectors comercials. Entre les tècniques electroquímiques, les metodologies més simples, comunes i més fàcils de transportar són aquelles basades en la potenciome

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36

Moya, Horacio Dorigan. "Estudo potenciométrico dos equilíbrios no sistema manganês (II) / azoteto." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-30072008-072805/.

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Foram estudados os equilíbrios dos complexos de Mn (II) com íons azoteto, em meio aquoso, por método potenciométrico indireto, através de medidas de pH, em meio de azoteto 0 a 1,8 M, e a 25,0 ºC, utilizando força iônica 2,00 M mantida com perclorato de sódio. Nas diferentes concentrações de íon metálico empregadas, 20, 40, 60, 80 e 100 mM, obteve-se uma mesma curva de formação de número médio de ligantes vs. concentração de ligante livre, o que configura a inexistência de complexos polinucleares nessas condições experimentais. Os valores de número médio de ligantes n¯, e de concentração d

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37

Silva, Larissa Santos. "Construção e otimização de um eletrodo de pasta de carbono modificado com óxido de manganês tipo espinélio dopado com cobalto (III) para determinação potenciométrica de íons lítio." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-02022015-113733/.

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Os efeitos terapêuticos dos sais de lítio são comprovados no tratamento de pacientes com depressão, certos tipos de câncer e transtornos bipolares de humor. A dosagem de lítio deve ser cuidadosamente controlada em cada paciente já que excessos na dosagem podem conduzir a danos irreversíveis no sistema nervoso e nos rins. Sendo assim é interessante produzir métodos de baixo custo, simples e rápidos que permitam o monitoramento desse íon. Portanto no presente trabalho foi estudado o desempenho potenciométrico de um eletrodo compósito de pasta de carbono modificado com óxido de manganês tipo espi

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38

Selling, Anna. "Equilibrium and structure studies of aqueous vanadophosphates and molybdovanadophosphates." Doctoral thesis, Umeå universitet, Kemiska institutionen, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-111109.

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39

Walmsley, Ryan Steven. "An investigation into the antidiabetic and catalytic properties of oxovanadium(IV) complexes." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1004978.

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In part 1 of this thesis, the antidiabetic activity of a series of novel oxovanadium(IV) complexes was investigated. A range of bidentate N,O-donor ligands, which partially mimic naturally occurring bioligands, were prepared and reacted with the vanadyl ion to form the corresponding bis-coordinated complexes. Initially, 2-(2ˊ-hydroxyphenyl)-1R-imidazoline (where R = H, ethyl and ethanol) ligands were prepared. The aqueous pH-metric chemical speciation was investigated using glass electrode potentiometry which allowed for the determination of protonation and stability constants of the ligands a

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Düzgün, Ali. "Carbon nanotube based potentiometric aptasensors for protein detection." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/111166.

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El diagnóstico rápido de la mayoría de las enfermedades tiene una importancia vital para proporcionar el remedio adecuado y, por lo tanto, el control de problemas de salud. La detección rápida y selectiva de biomoléculas grandes, específicamente proteínas, es uno de los objetivos importantes en este campo. Las técnicas basadas en inmunoensayos son las más comúnmente utilizadas, aunque requieren un marcaje específico. Por lo general, estos métodos también requieren personal altamente capacitado y equipos complejos que se traduce en una metodología relativamente cara y lenta. En la presente t

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Taube, Fabian. "Characterization of Aqueous Peroxomolybdates with Catalytic Applicability." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-45.

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Abstract This thesis is a summary of five papers, containing equilibrium and structure studies of aqueous molybdate and peroxomolybdate species. Some of the peroxomolybdate species have also been studied in terms of their dynamic and catalytic properties. The primary objective was to characterize species with potential catalytic activity, with emphasis on thebleach process of kraft pulp. For this, potentiometry, EXAFS and 17O, 31P, 1H and 95 Mo NMR have been used. The molybdate speciation in 0.300 M Na2(SO4) medium was found to differ from that in 0.600 M Na(Cl) medium, in that the uncharged m

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Guinovart, Pavón Tomàs de Aquino. "Addressing emerging paradigms in chemical analysis: new platforms for wearable and decentralized sensors." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/401830.

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L’objectiu principal d’aquesta tesi és l’exploració de noves fronteres en l’àrea de sensors químics. Primerament, a través del desenvolupament de nous enfocs per construir sensors químics vestibles. Seguidament, a través de la generació de noves maneres de sensar electròlits en mostres reals. La potenciometria i la detecció òptica seran les tècniques utilitzades. L’ús de la potenciometria cap al 1900, amb els elèctrodes selectius de ions (ESI), ha anat canviant i la revolució va començar amb la miniaturització d’aquests ESI amb l’aparició de la necessitat de sensors per monitoritzar el nostr

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Bengtsson, Åsa. "Solubility and Surface Complexation Studies of Apatites." Doctoral thesis, Umeå universitet, Kemi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1408.

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Apatites are a diverse class of phosphate minerals that are important in a great variety of natural and industrial processes. They are, for example, used as raw material in fertiliser production and in the remediation of metal-contaminated soils. Hydroxyapatite Ca5(PO4)3OH, (HAP) and fluorapatite Ca5(PO4)3F, (FAP) are similar to the biological apatite that is the main constituent of mammalian bone and teeth, and they are therefore promising materials for artificial bone and tooth implants. This thesis is a summary of four papers with focus on dissolution and surface complexation reactions of H

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Kučera, Vojtěch. "Pracoviště pro měření elektrochemických článků pomocí cyklické voltametrie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217923.

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The thesis deals with observation of cells parameters. One of the potential solutions for observing the characteristics of cells are utilization the electrochemical analyse called voltametry. Its fundamental consists of loading variable voltage in between two electrodes dipped in electrolytic solution and monitoring flowing current. The point of the thesis is to build up the measuring workplace, which can provide this measurement. We suggest utilization of modern laboratory technique and connection the measuring instruments with PC. The first part of the thesis deals with theoretical knowledge

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Parrilla, Pons Marc. "New Electrochemical Sensors for Decentralized Analysis." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/396297.

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Nous sensors electroquímics per a analisis decentralitzats és una tesis que emmarca diferents aspectes del desenvolupament de sensors potenciomètrics, des de la seva fabricació, el diseny adequat, i finalment, la seva aplicabilitat en escenaris reals. En el context actual, l'evolució de la tecnologia, especialment l'aparició a nivell global d'internet, i la disponibilitat d'aquesta a baix cost han permès la creació d'eines que ens permeten connectar el món físic i, en el cas d'aquesta tesis, el món químic a la xarxa. Aquesta connexió aporta un nou grau dins l'escala de valor per a la societat

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Tavares, Marina Franco Maggi. "Viabilidade do uso do eletrodo de mercúrio como indicador, no estudo da formação de complexos, no sistema Hg(II)/S2O32+, em meio aquoso (OU) Viabilidade do uso do eletrodo de mercurio, no estudo da formação de complexos, no sistema Hg(II)/tiossulfato." Universidade de São Paulo, 1986. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-30092011-095813/.

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O presente trabalho procura dar continuidade a uma das linhas de pesquisa desenvolvida pelo Grupo de Química Analítica do Instituto de Química da Universidade de são Paulo: o estudo da formação de complexos. O sistema Hg(II) / S2O2-3 foi analisado potenciometricamente, com a finalidade de identificar o número de complexos formados, assim como estimar as constantes de estabilidade envolvidas no fenônemo de complexação. Tal equilíbrio foi levado a termo a 25,0 ± 0,1°C, e força iônica 2,00M, sendo detectados quatro espécies complexas. O modelo matemático que melhor se ajustou aos dados

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Baliza, Patrícia Xavier. "Estudo potenciométrico de reações oscilantes para a determinação de ácido ascórbico, por perturbação do padrão de oscilação." Universidade Federal de Viçosa, 2006. http://locus.ufv.br/handle/123456789/2105.

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Made available in DSpace on 2015-03-26T13:00:21Z (GMT). No. of bitstreams: 1 texto completo.pdf: 978957 bytes, checksum: c5b394b00dba0b937a92743bd2cfcc39 (MD5) Previous issue date: 2006-07-21<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The purpose of this investigation was to propose the determination of ascorbic acid in pharmaceutical drug samples, by means of a laboratorymade potentiometric system that allowed the study of oscillating reactions. The method is based in the effect of ascorbic acid in oscillation pattern of Belousov-Zhabotinskii reaction. The experimen

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Abate, Gilberto. "Isolamento, purificação e estudos de complexação de substâncias húmicas." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-26082008-144333/.

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No presente trabalho focalizou-se a atenção nas propriedades de substâncias húmicas, em particular a fração de ácido húmico (AH), o qual foi obtido de duas fontes, sendo uma comercial e outra isolada de sedimentos do Rio Tietê, coletados no reservatório de Barra Bonita (SP). O isolamento do AH do sedimento foi realizado segundo o procedimento proposto pela Sociedade Internacional de Substâncias Húmicas (S.I.S.H.). Ambas amostras foram caracterizadas em paralelo através de análise elementar, absorção molecular no visível (razão E4/E6) e infravermelho e teores de cinzas. As propriedades ácido-ba

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Migoney, Touze Véronique. "Fonctionnalisation de la surface interne de matériaux tubulaires : étude de l'inhibition de la thrombine par l'antithrombine III à la surface de ces matériaux." Paris 13, 1986. http://www.theses.fr/1986PA132006.

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Modification chimique de polystyrène greffé sur la surface interne de tubes en polyethylène pour rendre anticoagulante la surface interne de ces tubes employés comme catheter. Fixation de groupes fonctionnels sulfonate et sulfamide d'acide aspartique par liaison covalente en para des cycles benzeniques du polystyrène

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Missel, Josué da Rosa. "Investigação de equilíbrios através de potenciometria e voltametria com resolução multivariada de curvas." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/4224.

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The interaction between the amino acid glutathione (GSH) and zinc (II) and cadmium (II) ions was investigated using data obtained by potentiometric and voltammetric measurements. Solutions with ionic strength 0.1 M KCl with different metal-ligand ratios were titrated with standard solution of KOH and the pH profiles obtained were used to propose models of chemical equilibrium between the species. The potentiometric data treatment was performed using the Hyperquad software, which enabled that the formation constants of the differents pecies could be refined. The program HySS,belonging to the Hy

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