Selectivity coefficients for ion-selective electrodes: Recommended methods for reporting KA,Bpot values (Technical Report)

Umezawa, Yoshio; Umezawa, Keitaro; Sato, Hitoshi

doi:10.1351/pac199567030507

Cited by 1,184 publications

(504 citation statements)

References 1 publication

(1 reference statement)

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“…Calibration curves were constructed by plotting the potential vs the logarithm of the concentration of the anion present in the tested solution. Potentiometric selectivity coefficients ( log K I /J Pot ) were then determined by the separate solution method (SSM) [43], with the primary (I) and interfering (J) ion concentrations being 10 −2 M. In those membranes where no theoretical potentiometric response was observed, the potentiometric selectivity was estimated using the matched potential method (MPM) [43]. In the MPM, a 10 −4 M concentration of sodium salicylate was used as the background.…”

Section: Electrodes and Emf Measurementsmentioning

confidence: 99%

Potentiometric response and mechanism of anionic recognition of heterocalixarene-based ion selective electrodes

Shishkanova

Sýkora

Sessler

et al. 2007

Analytica Chimica Acta

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The ion selective electrode (ISE)-based potentiometric approach is shown to be an effective means of characterizing the anion recognition sites in the molecular receptor calix[2]pyridino[2]pyrrole (CPP). In particular, potentiometric pH-measurements involving the use of experimental PVCmembranes based on CPP revealed the existence of both mono-and diprotonated forms of the receptor under readily accessible conditions. Based on these analyses, apparent surface protonation constants for this heterocalixarene were found to lie between 8.5-8.9 (pK B1 ) and 3.3-3.8 (pK B2 ). CPP was found to interact with targeted anionic analytes based on both coulombic and hydrogen bond interactions, as inferred from varying the kinds of ionic sites present within the membrane phase. Potentiometric selectivity studies revealed that CPP preferred "Y-shaped" anions (e.g. acetate, lactate, benzoate) over spherical anions (e.g. fluoride and chloride), fluoride over chloride within the set of spherical anions, and the ortho-isomer over the corresponding meta-and para-isomers in the case of hydroxybenzoate (salicylate and congeners). In the context of this study the advantages of potentiometric determinations of acetylsalicylic acid using optimized PVC-membranes based on CPP relative to more conventional PVC-membrane ISEs based on traditional anion exchanger were also demonstrated.

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Section: Electrodes and Emf Measurementsmentioning

confidence: 99%

Potentiometric response and mechanism of anionic recognition of heterocalixarene-based ion selective electrodes

Shishkanova

Sýkora

Sessler

et al. 2007

Analytica Chimica Acta

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“…30 According to this method, a specified activity (concentration) of primary ions (A, 5.0 × 10 -5 mol L -1 of zinc ions) is added to a reference solution (1.0 × 10 -6 mol L -1 of zinc ion) and the potential is measured. In a separate experiment, interfering ions (B, 1.0 × 10 -1 mol L -1 ) are successively added to an identical reference solution, until the measured potential matches the one obtained before adding primary ions.…”

Section: Selectivity Of the Sensormentioning

confidence: 99%

Zinc(II) PVC-based membrane sensor based on 5,6-benzo-4,7,13,16,21,24- hexaoxa-1,10-diazabicyclo[8,8,8]hexacos-5-ene

Zamani¹,

Ganjali²,

Pooyamanesh³

2006

J. Braz. Chem. Soc.

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A substância 5,6-benzo-4,7,13,16,21,24-hexaoxa-1,10-diazabiciclo[8,8,8]hexacos-5-eno (BHDE) foi usada como um excelente ionóforo na construção de um sensor de membrana para Zn(II ), em PVC. O melhor desempenho foi obtido para a membrana com a composição de 30% de policloreto de vinila, 64,5% de nitrobenzeno (NB), 2,5% BHDE e 3% de tetrafenilborato de sódio (NaTPB). Este sensor mostra alta seletividade e sensitividade ao íon zinco, frente a uma grande variedade de cátions, incluindo íons de metais alcalinos, alcalinos terrosos, de transição e de metais pesados. O sensor revelou um grande aumento nos coeficientes de seletividade para íons zinco, em comparação a sensores de zinco previamente relatados. O sensor proposto exibe um comportamento Nernstiniano (com inclinação de 29,1 ± 0,4 mV por década) em um grande intervalo de concentração (1,0 × 10 -6 a 1,0 × 10 -1 mol L -1 ), com limite de detecção de 6,3 × 10 -7 mol L -1 (41,2 ng mL -1 ). Mostrou, em toda faixa de concentração usada, um tempo de resposta relativamente curto (< 10s), e pode ser usado por, no mínimo, 10 semanas em um intervalo de pH de 2,8 -7,3. O sensor proposto foi usado com sucesso na determinação direta de íons zinco em águas de descarte de companhias de eletrodeposição de zinco industrial, e também como um eletrodo indicador na titulação com EDTA.The 5,6-benzo-4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo [8,8,8]hexacos-5-ene (BHDE) was used as an excellent ionophore in construction of a Zn(II) PVC-based membrane sensor. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 64.5% nitrobenzen (NB), 2.5% BHDE and 3% sodium tetraphenylborate (NaTPB). This sensor shows very good selectivity and sensitivity towards zinc ion over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a great enhancement in selectivity coefficients for zinc ions, in comparison to the previously reported zinc sensors. The proposed sensor exhibits a Nernstian behavior (with slope of 29.1 ± 0.4 mV per decade) over a wide concentration range (1.0 × 10 -6__ 1.0 × 10 -1 mol L -1 ) with a detection limit of 6.3 ×10 -7 mol L -1 (41.2 ng mL -1 ). It shows relatively fast response time, in the whole concentration range (< 10s), and can be used for at least 10 weeks in a pH range of 2.8-7.3. The proposed sensor was successfully used in direct determination of zinc ions in wastewater of industrial zinc electroplating companies, and also as an indicator electrode in titration with EDTA.

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“…In this work, the potential responses of the proposed Ag + membrane sensor to a wide variety of cations were investigated through the matched potential (MPM) 37 and separation solution method (SSM). 38 The resulting selectivity coefficient values obtained for the Ag + membrane electrode are summarized in Table 4.…”

Section: Evaluation Of Selectivity Coefficientsmentioning

confidence: 99%

Ion recognition: synthesis of 2-methyl-2,4-di (2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine and its application in construction of a highly selective and sensitive Ag+ membrane sensors

Ganjali¹,

Norouzi²,

Alizadeh³

et al. 2006

J. Braz. Chem. Soc.

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Uma membrana carregadora plastificada foi preparada a partir de 2-metil-2,4-di(2-tienil)-2,3-diidro-1H-1,5-benzodiazepina (MTHB). Esta membrana é altamente sensível e seletiva a íons Ag + . O sensor mostra um intervalo dinâmico linear de 1,0 × 10 -6 -1,0 × 10 -1 mol L -1 , com inclinação Nernstiniana de (58,5±0,3) mV per década, e limite de detecção 5,0 × 10 -7 mol L -1 (~54 ppb). Apresenta rápido tempo de resposta, 10s, e pode ser usado por 8 semanas no mínimo, sem alterações consideráveis no seu potencial. O sensor proposto pode ser usado no intervalo de pH entre 4,0 e 8,0 e foi utilizado com sucesso, como eletrodo indicador, na titulação potenciométrica de Ag + com NaCl.A highly selective and sensitive plasticized membrane sensor for Ag + ions based on 2-methyl-2,4-di(2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine (MTHB) as membrane carrier was prepared. The sensor shows a linear dynamic range of 1.0 × 10 -6 -1.0 × 10 -1 mol L -1 , with a Nernstian slope of (58.5±0.3) mV decade -1 , and a detection limit of 5.0 × 10 -7 mol L -1 (~54 ppb). It has a fast response time of 10 s and can be used for at least eight weeks without any considerable divergences in its potentials. The proposed sensor revealed very good selectivities with respect to the most of common metal ions. The proposed sensor could be used in a pH range of 4.0-8.0. It was successfully used as an indicator electrode in potentiometric titration of Ag + with NaCl.Keywords: potentiometric sensor, Ag + sensor, PVC membrane, 2-methyl-2,4-di(2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine (MTHB) IntroductionSilver plays no known natural biological role in humans, and possible health effects of silver are subject of dispute. Silver itself is not toxic but most of its salts are, and some may be carcinogenic. The toxicity of silver is characterized by a severe pulmonary edema, hemorrhage and necrosis of bone marrow, liver, and kidney. Long-term human exposure to silver salts or colloidal silver may cause argyria. Repeated exposure of animals to silver may produce anemia, cardiac enlargement, growth retardation and degenerative changes in the liver. Silver compounds were used successfully to prevent infection in World War I before the advent of antibiotics, and Silver compounds are still widely used externally today to accelerate healing in burn victims. Very low concentrations of silver are present in various complex samples like drinking water (5 μg L -1 , soil, rock, coal fly ash, air, cigarettes, alloys, plants, sea water etcetera). 1,2 Some techniques such as atomic absorption spectroscopy, 3 inductively coupled plasma, 4 spectroscopy with complexation agents 5 and Rayleigh light-scattering 6 have been used to determine amount of silver.Because of the increasing use of silver compounds in industry and medicine the quick determination of trace quantities of Ag + ion by simple methods is important in chemical, clinical and environmental analysis.Potentiometer monitoring based on ion-selective membrane sensor, as a simple method, offers several advantages such a...

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Selectivity coefficients for ion-selective electrodes: Recommended methods for reporting KA,Bpot values (Technical Report)

Abstract: Abstract

Cited by 1,184 publications

References 1 publication

Potentiometric response and mechanism of anionic recognition of heterocalixarene-based ion selective electrodes

Potentiometric response and mechanism of anionic recognition of heterocalixarene-based ion selective electrodes

Zinc(II) PVC-based membrane sensor based on 5,6-benzo-4,7,13,16,21,24- hexaoxa-1,10-diazabicyclo[8,8,8]hexacos-5-ene

Ion recognition: synthesis of 2-methyl-2,4-di (2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine and its application in construction of a highly selective and sensitive Ag+ membrane sensors

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