A conductance study of the association of alkali cations with 1,13-dibenzo-24-crown-8 in acetonitrile

Tawarah, Khalid M.; Mizyed, Shehadeh

doi:10.1007/bf00656776

Cited by 71 publications

(28 citation statements)

References 23 publications

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“…Under the dilute conditions we used, the activity coefficient of the unchanged ligand f(L) can be reasonably assumed to be unity. 24 The use of Debye-Hückel limiting law of 1:1 electrolytes 25 leads to the conclusion that f(M n+ ) ≈ f(ML n+ ), so the activity coefficient in Eq. (2) is canceled out, and therefore the complex formation constant in term of the molar conductance can be expressed as:…”

Section: Procedures Of Conductance Studymentioning

confidence: 99%

Synthesis of N′-(1-Pyridin-2-ylmethylene)-2-furohydrazide and Its Application in Construction of a Highly Selective PVC-Based Membrane Sensor for La(III) Ions

et al. 2006

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Section: Procedures Of Conductance Studymentioning

confidence: 99%

Synthesis of N′-(1-Pyridin-2-ylmethylene)-2-furohydrazide and Its Application in Construction of a Highly Selective PVC-Based Membrane Sensor for La(III) Ions

et al. 2006

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“…Under the dilute condition we used, the activity coefficient of the uncharged ligand, f (L) can be reasonably assumed as unity. 24 The use of Debye-Hückel limiting law of 1:1 electrolytes, 25 lead to the conclusion that f (M n+ ) ≈ f (ML n+ ) , so the activity coefficient in equation (2) is canceled out. Thus, the complex formation constant in term of the molar conductance, Λ, can be expressed as: 26 (3) Where (4) 151 Zinc(II) PVC-Based Membrane Sensor Vol.…”

Section: Procedures Of Complexation Studymentioning

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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“…Under the dilute condition we used, the activity coefficient of the uncharged ligand, f (L) can be reasonably assumed as unity. 26 The use of Debye-Hückel limiting law of 1:1 electrolytes, 27 lead to the conclusion that f (M n+ ) ≈ f (ML n+ ) , so the activity coefficient in equation (2) is canceled out. Thus, the complex formation constant in term of the molar conductance, Λ, can be expressed as: 28 (3) Where (4) Here, Λ M is the molar conductance of the cation before addition of AMTOT, Λ ML the molar conductance of the complexed, Λ obs the molar conductance of the solution during titration, C L the analytical concentration of the AMTOT added, and C M the analytical concentration of the cation salt.…”

Section: Procedures Of Complexation Studymentioning

confidence: 99%

Synthesis of 4-amino-6-methyl-1,2,4-triazin-5-one-3-thione and its application in construction of a highly copper(II) ion-selective electrochemical sensor

Zamani¹,

Rajabzadeh²,

Firouz³

et al. 2005

J. Braz. Chem. Soc.

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Um sensor altamente seletivo para Cu(II) usando 4-amino-6-metil-1,2,4-triazina-5-ona-3-tiona (AMTOT) como material seletivo, foi desenvolvido utilizando uma membrana de PVC. O eletrodo exibe um intervalo dinâmico linear entre 1,0×10 -1 e 1,0×10 -6 mol L -1 , com resposta Nernsteniana de 29,3 ± 0,6 mV por década e um limite de detecção de 6,2×10 -7 mol L -1 . A resposta do eletrodo é independente do pH, no intervalo entre 2,5 e 7,0. O sensor possui a vantagem de apresentar um tempo de condicionamento pequeno, uma rápida velocidade de resposta (< 20 s) e especialmente, uma boa seletividade frente a metais pesados e de transição, e a alguns cátions mono, di e trivalentes. O eletrodo pode ser usado por até 9 semanas sem consideráveis divergências de potencial. O eletrodo proposto foi aplicado com sucesso na determinação de cobre em águas de descarte, oriundas de plantas eletroquímicas de cobre e como eletrodo indicador na titulação potenciométrica de íons Ca(II) com EDTA.A highly Cu(II) ion-selective PVC membrane sensor based on 4-Amino-6-methyl-1,2,4-triazin-5-one-3-thione (AMTOT) as an excellent sensing material was developed. The electrode exhibits a linear dynamic range between 1.0×10 -1 and 1.0×10 -6 mol L -1 , with a near Nernstian slope of 29.3 ± 0.6 mV per decade and a detection limit of 6.2×10 -7 mol L -1 . The sensor response is independent of the pH of the solution in the pH range of 2.5 -7.0. The sensor possesses the advantages of short conditioning time, fast response time (<20 s), and especially, very good selectivity towards transition and heavy metal, and some mono, di and trivalent cations. The electrode can be used for at least 9 weeks without any considerable divergence in the potentials. The proposed electrode was successfully applied to the determination of copper in wastewater of copper electroplating samples and as an indicator electrode in potentiometric titration of Ca(II) ions with EDTA.Keywords: potentiometry, copper sensor, PVC membrane, 4-amino-6-methyl-1,2,4-triazin-5-one-3-thione IntroductionDuring the last decade, there has been a renewed resurgence in developing potentiometric membrane electrodes as devices for rapid, accurate, low cost and non destructive analysis of different samples with small volume samples.Due to the necessary need for selective copper measurements in many copmplex biological systems, 1,2 geochemical, 3 environmental, medicinal and industrial samples, 4 the search for new selective and sensitive PVCmembrane electrodes for its quick measurement is still a challenging goal. We have recently reported a number of highly selective and sensitive membrane sensors for various metal ions. [23][24][25] In this paper, we wish to introduce a highly copper(II)-selective sensor based on 4-Amino-6-methyl-1,2,4-triazin-5-one-3-thione (AMTOT), as a novel neutral ionophore for monitoring of copper in industrial samples (Figure 1). Experimental ReagentsReagent grade 2-nitrophenyl octyl ether (NPOE), dibutyl phthalate (DBP), benzyl acetate (BA), nitrobenzene (NB), sodium tetraphen...

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A conductance study of the association of alkali cations with 1,13-dibenzo-24-crown-8 in acetonitrile

Cited by 71 publications

References 23 publications

Synthesis of N′-(1-Pyridin-2-ylmethylene)-2-furohydrazide and Its Application in Construction of a Highly Selective PVC-Based Membrane Sensor for La(III) Ions

Synthesis of N′-(1-Pyridin-2-ylmethylene)-2-furohydrazide and Its Application in Construction of a Highly Selective PVC-Based Membrane Sensor for La(III) Ions

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

Synthesis of 4-amino-6-methyl-1,2,4-triazin-5-one-3-thione and its application in construction of a highly copper(II) ion-selective electrochemical sensor

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