Ion‐selective electrodes – analogies and conclusions

Püngor, E.

doi:10.1002/elan.1140080409

Cited by 22 publications

(11 citation statements)

References 20 publications

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“…This result may, however, be not totally contradictory since the concentration of the ionophore on the membrane surface was probably much lower than the overall bulk concentration measured in the membrane. For membranes with thicknesses of several hundred micron, the mechanism of potentiometric response is limited by the surface reaction [32], which implies that total depletion of ionophore on the membrane surface by leaching will render nonideal behavior even though the membrane bulk may still contain an adequate concentration.…”

Section: Leaching Studies Of Crown Ethers From Membranesmentioning

confidence: 99%

Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Heng

Hall

2000

Electroanalysis

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Methacrylic-acrylic copolymers that can be externally or internally plasticized were used to fabricate potassium ion-selective electrodes (ISE) with crown ethers as the potassium selective ionophores. Copolymers which required external plasticizer have higher methacrylate content and glass transition temperatures (T g ) of approximately 30 C whereas the internally plasticized (self-plasticized) copolymer is high in acrylate with T g & À 27 C. Nonlipophilic crown ethers such as benzo-15-crown-5 and benzo-18-crown-6 could be included in the plasticized copolymers and yielded functional ISEs, but as with the plasticized PVC membranes these crown ethers tend to show some leaching which reduced the ISE lifetime; they were also incompatible with the`self-plasticized copolymer', forming opaque membranes and electrodes of no potassium selectivity. In contrast, lipophilic crown ethers such as bis-or mono-nitrobenzo-15-crown-5 were found to be compatible with the self-plasticized copolymers yielding ISEs with good potassium ion selectivity, closely resembling plasticized PVC membrane based electrodes even though these new membranes contained no added plasticizer. This work has shown that it is possible to prepare ISEs based on nonplasticized methacrylic-acrylic polymers using lipophilized crown ethers to ensure compatibility with the polymer and deter leaching.

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Section: Leaching Studies Of Crown Ethers From Membranesmentioning

confidence: 99%

Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Heng

Hall

2000

Electroanalysis

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“…1,2 Solidstate electrochemical sensors based upon chalcogenide glass membranes have been studied extensively in the past decade and were shown to be promising ion-selective membranes for the detection of heavy metals in various electrolytes. 3 -5 In fact, many solid-state ISEs possess long lifetimes, acceptable potential stability and mechanical stability; however, the superior chemical stability of chalcogenide glasses makes them highly desirable as analytical sensors.…”

Section: Introductionmentioning

confidence: 99%

Surface studies of a chalcogenide glass ferric ion‐selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics

Pejcic

Prince

2002

Surface & Interface Analysis

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“…The selectivity mechanism is mainly based on the sterospecificity and electrostatic environment, and is dependent on how much fitting is present between the locations of the lipophilicity sites in the two competing species on the bathing solution side and those present in the receptor of thei on-exchanger [25].I no ther words, thed istributiono ft he active components situated at theelectrode surfaceallow theprimary ions to reactbut do notenter the membrane phaseu nder zero-current conditions andt hise xplained thef actt hatt he electrodes urface is notc ompletelyf latb ut hasd epressions andh ills [26]. …”

Section: Selectivitymentioning

confidence: 99%

Potentiometric Flow Injection Analysis of Bromhexine Hydrochloride and its Pharmaceutical Preparation Using Conventional and Coated Wire Ion-Selective Electrodes

2006

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Bromhexine hydrochloridei on-selectivee lectrodes (conventionalt ype)b ased on bromhexinium tetraphenylb orate( I) andb romhexinium-phosphotungstate (II) were prepared.T he electrodes exhibitedm ean slopes of calibration graphs of 59.4 mV and 59.8 mV per decade of bromhexine concentrationa t2 5 Cf or electrode (I) and (II),r espectively.B oth electrodes couldb eu sed within the concentrationr ange 3.16x10-5 -1.00x10 -2 Mb romhexine within the pH range 2.0-4.5. The standard electrodes potentials were determined at different temperatures and used to calculate the isothermal coefficients of the electrodes, which were 0.00065 and 0.00050V C -1 for (I) and (II), respectively. The electrodes showed av ery good selectivity for bromhexine with respect to an umber of inorganic cations, amino acids and sugars. The electrodes were applied to the potentiometric determination of bromhexine hydrochloride and its pharmaceutical preparationu nder batch and flow injection conditions.G raphite, copper and silver coated wires were prepared, characterized and successfully applied as sensors for the drug under investigation. KeywordsIon-selectivee lectrodes, bromhexine hydrochloride, conventional andc oated wire electrodes,flowinjection analysis andconductimetry.Scientia Pharmaceutica (Sci. Pharm.) 74, 121-135

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Ion‐selective electrodes – analogies and conclusions

Cited by 22 publications

References 20 publications

Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Surface studies of a chalcogenide glass ferric ion‐selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics

Potentiometric Flow Injection Analysis of Bromhexine Hydrochloride and its Pharmaceutical Preparation Using Conventional and Coated Wire Ion-Selective Electrodes

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