Capillary Electrophoretic Determination of Different Classes of Organic Ions by Potentiometric Detection with Coated-Wire Ion-Selective Electrodes

Schnierle, Peter; Kappes, Thomas; Hauser, Peter C.

doi:10.1021/ac980117u

Cited by 82 publications

(57 citation statements)

References 18 publications

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“…It was, however, reported that their long-term potential stability was limited and they were, therefore, useful only in specific applications such as detectors for capillary electrophoresis [14] or in flow-injection analysis [15]. Their potential instability was attributed to lack of control of the concentrations of the species defining the redox potential at the membrane/metal interface [12,16,17] and their response characteristics were successfully improved by adding an appropriate redox-active component to the PVC membrane [18] or by using an intermediate redox-active polymer layer [19].…”

Section: Introductionmentioning

confidence: 99%

A polypyrrole-based solid-contact Pb2+-selective PVC-membrane electrode with a nanomolar detection limit

et al. 2004

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Ion-selective electrodes (ISE) based on conventional plasticized PVC membranes with solid inner contact (SC) have so far had unsatisfactory lower detection limits. Here it is shown that electropolymerization of pyrrole in the presence of potassium hexacyanoferrate(II)/(III) on Pt results in adequate inner contact for SC-ISE. The nanomolar lower detection limit achieved with the Pb 2+ -selective PVC membranes investigated is comparable with values obtained with optimized internal solutions of liquid-contact ISE.

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Section: Introductionmentioning

confidence: 99%

A polypyrrole-based solid-contact Pb2+-selective PVC-membrane electrode with a nanomolar detection limit

et al. 2004

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“…Eletrodos de membrana líquida foram inicialmente empregados [232][233][234][235][236][237][238] , mas devido à sua fragilidade e dificuldade de implementação, têm sido substituídos por eletrodos metálicos recobertos com filme seletivo 33,[239][240][241][242][243][244][245][246] . Estes possuem maior robustez, facilidade de alinhamento e fabricação, além de possuírem maior tempo de vida e nível de resposta comparável com os eletrodos de membrana líqui-da.…”

Section: Detecção Potenciométrica (Pd)unclassified

Detecção eletroquímica em eletroforese capilar

Silva¹

2003

Quím. Nova

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Recebido em 12/11/01; aceito em 11/6/02 ELECTROCHEMICAL DETECTION IN CAPILLARY ELECTROPHORESIS. This review focuses the development of electrochemical detection systems coupled to capillary electrophoresis. Conductometric, amperometric, voltametric, and potentiometric modes of detection are reviewed. The positioning of the electrodes, interferences of high electric field, and the materials employed in the fabrication and modification of the electrodes are discussed. The advantages of the use of electrochemical detection with capillary electrophoresis, regarding to the sensitivity and selectivity, is exemplified with a large number of applications. Also, the use of electrochemical detection systems in microchip technology is addressed.

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“…The improved performance characteristics of the CGE over those of PME presumably originate from the coated graphite technology, where an internal 1.0 × 10 -3 M Cu(NO3)2 solution, in the case of PME, has been replaced by a copper wire of much higher electrical conductivity, in the case of CGE. 38 Interfering ion PME CGE…”

Section: +mentioning

confidence: 99%

A 9,10-Anthraquinone Derivative Having Two Propenyl Arms as a Neutral Ionophore for Highly Selective and Sensitive Membrane Sensors for Copper(II) Ion

Shamsipur

Avanes²,

Javanbakht

et al. 2002

ANAL. SCI.

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The quick determination of trace quantities of cationic species by simple methods is of vital importance in chemical, environmental and industrial analyses. Potentiometric sensors based on solvent polymeric membranes with the incorporation of neutral ionophores have been shown to be very useful tools for these purposes, due to their ease of preparation, simple operation, relatively fast response, reasonable selectivity, wide linear dynamic range and low cost. [1][2][3][4][5] Due to the urgent need for selective copper determinations in many biological, 6,7 geochemical, 8 environmental and industrial samples, 9 the search for new sensitive and selective polymeric membrane sensors for its fast monitoring is still a challenging objective. 4 19 In recent years, we have successfully employed a number of new 9,10-anthraquinone derivatives as very suitable ion carriers in bulk liquid membrane transport 20 and the solid-phase extraction of metal ions, 21,22 in constructing of PVC-membrane ion-selective electrodes [23][24][25] and in stripping voltammetric analysis of lead ion. 26 In this paper we report on highly selective and sensitive solvent polymeric membrane (PME) and membrane-coated graphite electrodes (CGE) for Cu 2+ ion based on 1-hydroxy-2-(prop-2′-enyl)-4-(prop-2′-enyloxy)-9,10-anthraquinone (AQ), recently synthesized in our laboratories, 27 that manifest the properties of an excellent neutral ionophore for copper(II) ions. Experimental ReagentsReagent-grade 2-nitrophenyl octyl ether (NPOE), benzyl acetate (BA) sodium tetraphenylborate (NaTPB), oleic acid (OA), high relative molecular weight PVC and tetrahydrofuran (THF) were purchased from Merck chemical company and used as received. The nitrate salts of the cations used (all from Merck) were of the highest purity available, and used without any further purification, except for vacuum drying over P2O5. Anthraquinone AQ was synthesized and purified as described New polymeric membrane (PME) and coated graphite (CGE) copper(II)-selective electrodes based on 1-hydroxy-2-(prop-2′-enyl)-4-(prop-2′-enyloxy)-9,10-anthraquinone were prepared. The electrodes reveal linear emf-pCu 2+ responses over wide concentration ranges (1.0 × 10 -5 -1.0 × 10 -1 M with a slope of 27.3 mV decade -1 for PME and 8.0 × 10 -8 -5.0 × 10 -2 M with a slope of 29.1 mV decade -1 for CGE) and very low limits of detection (8.0 × 10 -6 M for PME and 5.0 × 10 -8 M for CGE). The potentiometric response is independent of the pH of the test solution in the pH range 3.0 -6.0. The proposed electrodes possess very good selectivities over a wide variety of other cations, including alkali, alkaline earth, transition and heavy metal ions, the selectivity coefficients for the CGE being much improved over those for the PME. The electrodes were used as indicator electrodes in the potentiometric titration of Cu 2+ and in the recovery of copper ions from wastewater.

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Capillary Electrophoretic Determination of Different Classes of Organic Ions by Potentiometric Detection with Coated-Wire Ion-Selective Electrodes

Cited by 82 publications

References 18 publications

A polypyrrole-based solid-contact Pb2+-selective PVC-membrane electrode with a nanomolar detection limit

A polypyrrole-based solid-contact Pb2+-selective PVC-membrane electrode with a nanomolar detection limit

Detecção eletroquímica em eletroforese capilar

A 9,10-Anthraquinone Derivative Having Two Propenyl Arms as a Neutral Ionophore for Highly Selective and Sensitive Membrane Sensors for Copper(II) Ion

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