Response time of ion-selective electrodes

Maccà, Carlo

doi:10.1016/j.aca.2004.03.010

Cited by 102 publications

(38 citation statements)

References 65 publications

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“…Therefore, the average time required for the DXM membrane sensors to reach a steady potential response within ±1 mV of the final equilibrium value after successive immersion in a series of DXM solutions, each having a 10-fold difference from low-to-high concentrations was measured. 33 It was found that the response times of the four sensors were as fast as 10 s, at higher concentrations ≥1.0 ¥ 10 -4 M DXM and within 30 s for the lower concentrations. This is most probably due to the rapid exchange kinetics of DXM + ions with the ionpair complexes at the test solution-membrane interface.…”

Section: Optimization Of Potentiometric Response Of the Sensorsmentioning

confidence: 99%

Polymeric Membrane Sensors for the Selective Determination of Dextromethorphan in Pharmaceutical Preparations

El-Naby

2008

ANAL. SCI.

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The construction and electrochemical response characteristics of poly(vinyl chloride) matrix ion-selective electrodes (ISEs) for dextromethorphan (DXM) hydrobromide are described. The membranes incorporate ion-association complexes of DXM with reineckate salt {[Cr(NH3)2(SCN)4]NH4} or phosphomolybdic acid [H3(PMo12O40)], as electroactive materials and dioctylphthalate or dibutylsebacate as a plasticizing solvent mediator. The sensors display a fast, stable and linear response with slopes of 54.4 to 59.5 mV/decade at pH 2.5 -6.5 and a detection limit of 1.0 ¥ 10 -6 M. Moreover, the sensors exhibit very good selectivity for DXM over opiate alkaloids, as well as organic and inorganic cations. The sensors proved to be useful for the determination of 5.0 ¥ 10 -5 -1.0 ¥ 10 -3 M DXM hydrobromide in pure as well as in dosage forms by direct potentiometry and standard addition methods. Determination of 5.0 ¥ 10 -4 M DXM using the standard addition method and a sensor based on phosphomolybdate and dioctylphthalate shows an average recovery of 99.8% and a relative standard deviation (RSD) of 0.4%.

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Section: Optimization Of Potentiometric Response Of the Sensorsmentioning

confidence: 99%

Polymeric Membrane Sensors for the Selective Determination of Dextromethorphan in Pharmaceutical Preparations

El-Naby

2008

ANAL. SCI.

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“…In line with his earlier critical examination of the practical determination of potentiometric sensor selectivity, Macca reviewed the current and previous IUPAC recommendations on how the response time of ion-selective electrodes (ISEs) should be reported and showed that most authors are not complying with them (72 references). 3 There have been numerous debates in the past about the exact response mechanism of ion-selective electrodes. A review summarized the applicability of the rather intuitive so-called phase boundary potential model, with many literature examples (119 references).…”

Section: Potentiometric Sensors Reviewsmentioning

confidence: 99%

Electrochemical Sensors

2006

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“…5) was investigated by dipping method [18][19][20][21] and was measured at various concentrations (1.0 × 10 −2 to 1.0 × 10 −6 M) of the test solution. The respective results are presented in Fig.…”

Section: Response Time Behavior Of the Proposed Electrodementioning

confidence: 99%

Comparative studies of praseodymium(III) selective sensors based on newly synthesized Schiff's bases

Gupta

Goyal

Pal

et al. 2009

Analytica Chimica Acta

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a b s t r a c tPraseodymium ion selective polyvinyl chloride (PVC) membrane sensors, based on two new Schiff's bases 1,3-diphenylpropane-1,3-diylidenebis(azan-1-ylidene)diphenol (M 1 ) and N,Nbis(pyridoxylideneiminato) ethylene (M 2 ) have been developed and studied. The sensor having membrane composition of PVC: o-NPOE: ionophore (M 1 ): NaTPB (w/w; mg) of 150: 300: 8: 5 showed best performances in comparison to M 2 based membranes. The sensor based on (M 1 ) exhibits the working concentration range 1.0 × 10 −8 to 1.0 × 10 −2 M with a detection limit of 5.0 × 10 −9 M and a Nernstian slope 20.0 ± 0.3 mV decade −1 of activity. It exhibited a quick response time as <8 s and its potential responses were pH independent across the range of 3.5-8.5.The influence of the membrane composition and possible interfering ions have also been investigated on the response properties of the electrode. The sensor has been found to work satisfactorily in partially non-aqueous media up to 15% (v/v) content of methanol, ethanol or acetonitrile and could be used for a period of 3 months. The selectivity coefficients determined by using fixed interference method (FIM) indicate high selectivity for praseodymium(III) ions over wide variety of other cations. To asses its analytical applicability the prepared sensor was successfully applied for determination of praseodymium(III) in spiked water samples.

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Response time of ion-selective electrodes

Cited by 102 publications

References 65 publications

Polymeric Membrane Sensors for the Selective Determination of Dextromethorphan in Pharmaceutical Preparations

Polymeric Membrane Sensors for the Selective Determination of Dextromethorphan in Pharmaceutical Preparations

Electrochemical Sensors

Comparative studies of praseodymium(III) selective sensors based on newly synthesized Schiff's bases

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