FTIR-ATR spectroscopic analysis of bis-crown ether based PVC-membranes - II. The diffusion behaviour of K+-complexes in the system PVC/dioctylsebacate/crown ether BME-44. Ex-situ-studies on dried membranes

R. Kellner, E. Zippel, E. Pungor, K. Tóth, E. Lindner

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28 Citations (Scopus)

Abstract

In order to get more information about the complexation reaction between potassium-selective electrode membranes and aqueous solutions of KCl, KSCN, NaCl, NaSCN, NH4Cl and NH4SCN, model membranes have been analyzed by the molecular-specific surface technique Attenuated Total Reflection (ATR) in the infrared region, thus providing an information depth between 0.1 and 3 μm depending on the angle of incidence of the radiation. The membranes have been prepared by dissolving PVC, dioctylsebacate and crown ether BME-44 in differing amounts in THF and casting in a glass ring on a glass plate. It has been found that DOS is slightly enriched at the surface but the membranes are sufficiently stable. It has further been found that complex formation occurs in the surface region for SCN- as well as Cl-. Pretreated and subsequently rinsed samples have shown that Cl- is almost totally washed away. But in the case of the lipophilic SCN-1 anion, this diffuses into the bulk; rinsing results in a loss at the near-surface region only. A special diffusion experiment, in which only one side of the membrane was in contact with the solution, has shown that diffusion of KSCN through the membrane occurs at a very low rate with a diffusion constant of appr. 10-8 cm2/s. For better understanding of the transport phenomena in situ measurements will be carried out.

Original languageEnglish
Pages (from-to)464-468
Number of pages5
JournalFresenius' Zeitschrift für Analytische Chemie
Volume328
Issue number6
DOIs
Publication statusPublished - Jan 1987

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Crown Ethers
Spectroscopic analysis
Fourier Transform Infrared Spectroscopy
Polyvinyl Chloride
Membranes
Glass
DOS
Complexation
Contacts (fluid mechanics)
Anions
Potassium
Electrodes
Casting
Radiation
Infrared radiation
Incidence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Clinical Biochemistry

Cite this

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title = "FTIR-ATR spectroscopic analysis of bis-crown ether based PVC-membranes - II. The diffusion behaviour of K+-complexes in the system PVC/dioctylsebacate/crown ether BME-44. Ex-situ-studies on dried membranes",
abstract = "In order to get more information about the complexation reaction between potassium-selective electrode membranes and aqueous solutions of KCl, KSCN, NaCl, NaSCN, NH4Cl and NH4SCN, model membranes have been analyzed by the molecular-specific surface technique Attenuated Total Reflection (ATR) in the infrared region, thus providing an information depth between 0.1 and 3 μm depending on the angle of incidence of the radiation. The membranes have been prepared by dissolving PVC, dioctylsebacate and crown ether BME-44 in differing amounts in THF and casting in a glass ring on a glass plate. It has been found that DOS is slightly enriched at the surface but the membranes are sufficiently stable. It has further been found that complex formation occurs in the surface region for SCN- as well as Cl-. Pretreated and subsequently rinsed samples have shown that Cl- is almost totally washed away. But in the case of the lipophilic SCN-1 anion, this diffuses into the bulk; rinsing results in a loss at the near-surface region only. A special diffusion experiment, in which only one side of the membrane was in contact with the solution, has shown that diffusion of KSCN through the membrane occurs at a very low rate with a diffusion constant of appr. 10-8 cm2/s. For better understanding of the transport phenomena in situ measurements will be carried out.",
author = "R. Kellner and E. Zippel and E. Pungor and K. T{\'o}th and E. Lindner",
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AU - Kellner, R.

AU - Zippel, E.

AU - Pungor, E.

AU - Tóth, K.

AU - Lindner, E.

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