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Ion selective membrane and preparation thereof

An ion-selective membrane and selective technology, which can be used in measurement devices, material analysis by electromagnetic means, instruments, etc., and can solve the problems of unstable electrochemical properties of electrodes.

Pending Publication Date: 2021-04-02
RADIOMETER AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause problems for subsequent measurements where the rinse composition is assumed to be constant
[0007] 2) The electrochemical properties of the electrode are unstable due to the changing composition of the membrane, thus requiring frequent calibration to meet performance requirements

Method used

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  • Ion selective membrane and preparation thereof
  • Ion selective membrane and preparation thereof
  • Ion selective membrane and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0263] Embodiment 1: the preparation of ion-selective membrane

[0264] A stock solution of hemimagnesium bis[4-octylphenyl]phosphate (MgOPP) was prepared by mixing MgOPP and cyclohexanone (>99.8%) at a ratio of 48.28 grams of cyclohexanone per gram of MgOPP. The compounds were mixed at room temperature and then stirred for a minimum of 8 hours at room temperature or a minimum of 4 hours at 37°C in the dark.

[0265] A membrane dispensing solution is prepared by mixing the following components:

[0266]

[0267] The compounds were mixed in vials filled with argon or nitrogen at room temperature and then stirred at room temperature for a minimum of 40 hours or at 37°C for a minimum of 16 hours in the dark. The resulting solution was used to dispense the membrane onto a poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)-(PEDOT-) covered gold electrode on a ceramic support. The solvent is then allowed to evaporate to obtain a plasticized ion-selective membrane.

Embodiment 2

[0268] Example 2: Comparison of membranes with various lipophilic salt compositions

[0269] The following three membranes with various lipophilic salt compositions were prepared essentially as described in Example 1:

[0270] 1. Membrane Mg899 contains bis[4-octylphenyl] hemicalcium phosphate but not bis[4-octylphenyl] hemimagnesium phosphate

[0271] 2. Membrane Mg900 contains bis[4-octylphenyl] hemimagnesium phosphate but not bis[4-octylphenyl] hemicalcium phosphate

[0272] 3. Membrane Mg901 contains 50% bis[4-octylphenyl] hemicalcium phosphate and 50% bis[4-octylphenyl]

[0273] Hemimagnesium Phosphate

[0274] Distribute each film onto two to three individual electrodes of an electrode array that also includes Ca 2+ ion selective electrode. The films were dispensed as described in Example 1. Each electrode array is placed into a measurement chamber in the test analyzer. The measurement chamber is in fluid contact with a reference electrode. The test analyzer is prog...

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Abstract

Processes for preparing ion selective membranes are presented, which have selectivity for a primary analyte (in particular magnesium) as well as another ion (in particular calcium), wherein a processcomprises addition of a) an ionophore (in particular 1,10- phenanthroline), b) a lipophilic salt containing said primary analyte (in particular hemi-magnesium bis[4-octylphenyl]phosphate) and c) a lipophilic salt containing said other ion (in partricular hemi-calcium bis[4-octylphenyl]phosphate). Also, ion selective membranes are presented which are prepared using said processes, in particular tomembranes selective for magnesium ions. In further aspects, electrodes and potentiometric sensors are presented comprising such membranes and the use thereof for determining ion concentrations in samples.

Description

technical field [0001] The invention relates to an ion-selective membrane and its preparation process, in particular to a membrane with selectivity for magnesium ions and its preparation. In a further aspect, the invention relates to electrodes and potentiometric sensors comprising such membranes and their use for determining ion concentrations in a sample. Background technique [0002] Ion-selective electrodes are electrodes that, when used in a potentiometric sensor, allow the determination of the activity of analyte ions in the presence of other interfering ions. A wide range of electrodes and sensors are available with selectivity for various anions and cations. However, obtaining absolute selectivity for a specific ion is challenging and sometimes impossible. Therefore, the ion selective membranes used in some electrodes do not sufficiently distinguish between the primary analyte and other ions. This is generally true, for example, of divalent ion selective electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
CPCG01N27/3335G01N27/414
Inventor T.S.汉森T.P.奈加德P.J.尼尔森K.M.汉森P.施奈德
Owner RADIOMETER AS