Lead-selective electrodes based on liquid ion-exchangers

Didina, S. E.; Mitnik, L.L.; Koshmina, N. V.; Grekovich, Alexander L.; Mikhelson, Konstantin N.

doi:10.1016/0925-4005(93)01009-s

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…Diphenylmethyl- N -phenylhydroxamic acid ( Pb 2+ -8 ), reported to be a charged carrier, was shown to give a quite high selectivity for Pb 2+ and a response slope of 28 mV/decade ( (SSM): Cu 2+ , −4.5; Cd 2+ , −2.9; Ca 2+ , −4.0; Ag + , −2.6; Hg 2+ , −1.8; DOS; sample solution: nitrate salts, pH 5−6) …”

Section: Pb2+/pba+ Sensorsmentioning

confidence: 99%

“…Diphenylmethyl-N-phenylhydroxamic acid (Pb 2+ -8), reported to be a charged carrier, was shown to give a quite high selectivity for Pb 2+ and a response slope of 28 mV/decade (K Pb,J pot (SSM): Cu 2+ , -4.5; Cd 2+ , -2.9; Ca 2+ , -4.0; Ag + , -2.6; Hg 2+ , -1.8; DOS; sample solution: nitrate salts, pH 5-6). 708 Particularly interesting seems to be the high discrimination of Ag + and Hg 2+ . ISEs based on chelates of Nbenzoyl-N-phenylhydroxylamine derivatives, on the other hand, showed substantial interference from Cu 2+ and Hg 2+ 639 Indeed similar ionophores were reported for Cu 2+ electrodes (e. g. Cu 2+ -10, section II.15).…”

Section: Bi 3+ Sensorsmentioning

confidence: 99%

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Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

1998

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and 1991, respectively. He has been working in the field of chemical sensors since 1970. Further topics of his interest are spectroscopic databases, automatic spectra interpretation, and modeling of structure−property relationships. He has published over 180 papers and 7 books. Current activities in the fields of chemical sensors and computer-aided analytical chemistry are documented on the web page http://www/ceac.ethz.ch/pretsch/. His e-mail address is pretsch@ org.chem.ethz.ch.

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Section: Pb2+/pba+ Sensorsmentioning

confidence: 99%

Section: Bi 3+ Sensorsmentioning

confidence: 99%

Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

1998

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“…After the solvent evaporation, the fabricated electrodes were conditioned in 10 −5 mol·L −1 Pb 2+ solution for 2 days and then 10 −10 mol·L −1 Pb 2+ solution for 1 day before measurements. All the Pb(NO 3 ) 2 solutions had the same background of 10 −4 mol·L −1 HNO 3 (pH = 3.8) in which Pb 2+ is the predominating form of lead [37].…”

Section: Methodsmentioning

confidence: 99%

Disposable Multi-Walled Carbon Nanotubes-Based Plasticizer-Free Solid-Contact Pb2+-Selective Electrodes with a Sub-PPB Detection Limit †

Liu

Gao

Yan

et al. 2019

Sensors

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Potentiometric plasticizer-free solid-contact Pb2+-selective electrodes based on copolymer methyl methacrylate-n-butyl acrylate (MMA-BA) as membrane matrix and multi-walled carbon nanotubes (MWCNTs) as intermediate ion-to-electron transducing layer have been developed. The disposable electrodes were prepared by drop-casting the copolymer membrane onto a layer of MWCNTs, which deposited on golden disk electrodes. The obtained electrodes exhibited a sub-ppb level detection limit of 10−10 mol·L−1. The proposed electrodes demonstrated a Nernstian slope of 29.1 ± 0.5 mV/decade in the linear range from 2.0 × 10−10 to 1.5 × 10−3 mol·L−1. No interference from gases (O2 and CO2) or water films was observed. The electrochemical impedance spectroscopy of the fabricated electrodes was compared to that of plasticizer-free Pb2+-selective electrodes without MWCNTs as intermediated layers. The plasticizer-free MWCNTs-based Pb2+-selective electrodes can provide a promising platform for Pb(II) detection in environmental and clinical application.

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Contribution of the Diffusion Potential to the Membrane Potential and to the Ion-Selective Electrode Response

Mikhelson¹,

Lewenstam

Didina

1999

Electroanalysis

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A generalized quasi‐thermodynamic theory of the solvent polymeric ion‐selective membranes containing ion‐exchanging sites (charged carrier) and a co‐exchanger (ionic additives) and in contact with two mixed aqueous solutions of electrolytes IX2 and JX is developed. To account for diffusion potential it is proposed to assume various profiles of species in the diffusion layer. A computer simulation of the potentiometric signal and of its selectivity is fulfilled. A surprising result of the simulations is that though the value of diffusion potential achieves sometimes several tens of mV, it is almost the same for different profiles assumed. If being profile‐independent, the diffusion potential occurs also time‐independent. Therefore the usually fast response of ISEs actually does not mean that only boundary potentials matter. The variability of selectivity coefficients to a large extent is also caused by diffusion potential. Artificial elimination of the diffusion potential with ionic additives to membranes based on calcium dioctylphenylphosphate allows one to eliminate the peculiarities like Ca/pH potential dips and also to stabilize selectivity coefficients.

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Lead-selective electrodes based on liquid ion-exchangers

Cited by 10 publications

References 4 publications

Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

Disposable Multi-Walled Carbon Nanotubes-Based Plasticizer-Free Solid-Contact Pb2+-Selective Electrodes with a Sub-PPB Detection Limit †

Contribution of the Diffusion Potential to the Membrane Potential and to the Ion-Selective Electrode Response

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