Electroanalytical, dynamic, and transport properties of nonionic surfactant-selective membranes

Kulapina, E. G.; Chernova, R. K.; Apukhtina, L. V.; Mitrokhina, S. A.; Materova, E. A.

doi:10.1007/bf02757327

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…The electrode, dynamic, and transport properties of the membranes and the results of radiochemical studies demonstrated that the membrane potential of NS-selective electrodes was due to the transfer of alkaline-earth ions, the formation of [Ba-NS] 2+ complex cations, and their extraction into the membrane phase [22].…”

Section: Resultsmentioning

confidence: 99%

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

2005

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Surfactants are the major components of highly toxic substances affecting the ecological state of the hydrosphere; concentrations of surfactants are regulated by MPCs. The ability of surfactants to adsorb on surfaces determines their biological activity, which consists in disturbing the function of biological membranes.The control over the concentration of these toxicants in the presence of organic and inorganic substances is complicated by both the variety of surfactant types and wide ranges of their concentrations, namely, from traces in domestic sewage water to tens of per cent in industrial waste water.At present, chromatographic and extraction-spectrophotometric methods are mainly used for determining surfactants. These methods involve the stage of preliminary separation, which makes the analysis longer and demands for toxic solvents [1][2][3][4][5].Selective electrodes with liquid filling [6-8] were proposed for determining surfactants, but in virtue of their construction features, they were inapplicable to the determination of surfactants without preliminary sampling. The replacement of ISE internal solutions with a solid contact between the current lead and the membrane afforded some advantages to solid-contact electrodes (SCEs): they are convenient in service and can be used in any spatial orientation for monitoring technological processes and environmental samples. Some publications were devoted to the application of solid-contact electrodes of the coated-wire type to the potentiometric titration of surfactants [9][10][11]. The main drawbacks of these electrodes are their instability and poor reproducibility of potentials in time.The choice of electronic conductors and the elucidation of the factors responsible for the stability of the electrochemical and operational characteristics of such sensors are important for designing solid-contact, membrane, surfactant-selective electrodes.In this work, some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors with the given electroanalytical and operational characteristics are considered. EXPERIMENTALThe formulae and percentages of the major substances of the surfactant samples under study (anionic (ASs), cationic (CSs), and nonionic (NSs) surfactants) are summarized in Table 1.Solutions of surfactants (1 × 10 -2 -5 × 10 -4 M) were prepared by dissolving their weighed portions in water under slight heating; solutions with concentrations of 1 × 10 -3 to 1 × 10 -6 M were prepared by successive dilution. A 0.01 M solution of sodium tetraphenylborate (Chemapol Co.) with the concentration of the major substance 98.5% was used throughout.Ion pairs of dodecylsulfate and alkylpyridinium cations ( n = 10-18), those of cetylpyridinium with alkylsulfates ( n = 10-16) and tetraphenylborate, as well as compounds of nonylphenol (NP-10, NP-12) or alcohol (Sintanol DS-10) polyethoxylates with ions of barium(II) and tetraphenylborate (NS-Ba-TPB) were used as ionophores. The synthesis of active components of membranes, the preparation...

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Section: Resultsmentioning

confidence: 99%

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

2005

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“…The appearance of a membrane potential of nonionic surfactant sensors is associated with dissociation of the complex cations [Me-NP-m] 2þ inside the membrane, transfer of metal ions through the membrane -solution interface with subsequent complex formation in the solution phase and extraction in dibutylphthalate. The electrodes used provide detecting either individual nonionic surfactants or the total content of them [39,54,55]. The potentiometric selectivity coefficients calculated by the mixed solution method to different homologous nonylphenols are close to unity.…”

Section: Resultsmentioning

confidence: 96%

“…The procedure decreased the detection limit to 3 Â 10 À6 M [36]. The potentiometric titration was used to separate qualification nonionic surfactants and poly(ethylene glycols) in commercial technical polyethoxylated alkylphenol samples [38,39].…”

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Quantification of Binary and Ternary Mixtures of Homologous Nonylphenol Polyethoxylates Using the Potentiometric Sensor Array

Макарова

Kulapina

2009

Electroanalysis

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The electronic tongue system based on the potentiometric sensor array for the determination of nonionic surfactants was developed. Multivariate statistical analysis techniques as partial least squares (PLS) method and backpropagation artificial neural networks (ANN) were used for data processing. The proposed system was applied for the quantitative analysis of homologous polyoxyethylated nonylphenols in complex multicomponent model mixtures and natural water samples. The least relative errors of detection were obtained for artificial neural network. Proposed approach could be applied to further analyze of sewage waters and commercial technical samples.

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“…On the basis of electrode, dynamic, transport properties of researched membranes, results of radiochemical research it has been shown, that the appearance of membrane potential in non-ionic surfactant sensors is due to dissociation of complex cations [non-ionic surfactant-Ba] 2þ in the membrane and transfer of metal ions through the membranesolution interface with subsequent complex formation in the solution phase and extraction into dibutyl phthalate [25]. This is confirmed by appropriate values of the electrode function slopes characteristic of the theoretical Nernst ones for univalent and bivalent ions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Multisensor Systems for Separate Determination of Homologous Anionic and Non‐Ionic Surfactants

Mikhaleva

Kulapina

2006

Electroanalysis

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The electrode, transport, selective properties and cross sensitivity of surfactant sensors based on various electrodeactive substances speak for their applicability in multisensor analysis. Permeability and ion flows of surfactants for ion-exchange membranes are estimated. Influence of the nature and concentration of electrode-active substances and the contacting solutions, membrane thickness on quantitative characteristics membrane transport is shown. The electrode, transport, and selective properties of surfactant membranes based on alkylpyridinium alkylsulfates and tetraphenylborate salts of complex cations of barium-polyethoxylate enable their usage in multisensor systems (electronic tongue). Arrays of solid-contact potentiometric sensors with a high cross sensitivity for separate detection of anionic and non-ionic surfactant homologues in multicomponent systems are designed. With the usage of multisensor surfactant systems and mathematical methods the ability of separate detection of homologous anionic and non-ionic surfactants in multicomponent model mixtures, natural waters and technical drugs is shown.

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Electroanalytical, dynamic, and transport properties of nonionic surfactant-selective membranes

Cited by 7 publications

References 9 publications

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

Quantification of Binary and Ternary Mixtures of Homologous Nonylphenol Polyethoxylates Using the Potentiometric Sensor Array

Multisensor Systems for Separate Determination of Homologous Anionic and Non‐Ionic Surfactants

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