Electroanalysis with Membrane Electrodes and Liquid–Liquid Interfaces

Bakker, Eric

doi:10.1021/acs.analchem.5b04034

Cited by 100 publications

(81 citation statements)

References 200 publications

(317 reference statements)

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“…Monitoring with chemical sensors eliminates the restrictions resulting from the need for sampling, sample preparation, and time delays resulting from ex-situ measurements, as they are typical for many methods of analysis. In particular, the integration of ion-selective electrodes (ISEs) [3][4][5][6][7][8][9][10][11] into a process system enables in-situ real-time monitoring [12,13]. However, this introduces its own challenges.…”

Section: Introductionmentioning

confidence: 99%

Cleaning of pH Selective Electrodes with Ionophore‐doped Fluorous Membranes in NaOH Solution at 90 °C

et al. 2017

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This work demonstrates the remarkable stability of fluorous ion‐selective electrode (ISE) membranes by exposing them to cleaning‐in‐place treatments (CIP) as they are used in many industrial processes. The sensing membranes consisted of Teflon AF2400 plasticized with a linear perfluoropolyether and doped with ionic sites and a H+ ionophore (i. e., tris[3‐(perfluorooctyl)propyl]amine, 1, or tris[3‐(perfluorooctyl)pentyl]amine, 2). To mimic a typical CIP treatment, the electrodes were repeatedly exposed for 30 min to a 3.0 % NaOH solution at 90 °C (pH 12.7). ISE membranes doped with the less strongly H+ binding ionophore 1 started to show reduced potentiometric response slopes and increased resistances after one exposure for 30 min to hot 3.0 % NaOH solution. No decomposition of the ionic sites and ionophore 1 at 90 °C was evident by 1H NMR spectroscopy, suggesting that the performance of membranes doped with 1 was compromised primarily by leaching of the negatively charged ionic sites along with H+ into the hot caustic solution. In contrast, even after ten exposures to hot 3.0 % NaOH for a cumulative 5 h at 90 °C, the fluorous sensing membranes doped with the more strongly H+ binding ionophore 2 still showed the ability to respond with a theoretical (Nernstian) slope up to pH 12. Addition of the fluorophilic electrolyte salt methyltris[3‐(perfluorooctyl)propyl]ammonium tetrakis[3, 5‐bis(perfluorohexyl)phenyl]borate reduced the membrane resistance by an order of magnitude.

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Section: Introductionmentioning

confidence: 99%

Cleaning of pH Selective Electrodes with Ionophore‐doped Fluorous Membranes in NaOH Solution at 90 °C

et al. 2017

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“…One piece of Whatman filter paper with a diameter 110 mm and pore size of 2.0 m (blue ribbon) was dipped into 0.01 M Fe 2 (SO 4 ) 3 solution for 1 h in order for iron(III) to absorb into the paper substrate. Then the Fe 3+ -impregnated filter papers were washed with distilled water for 3 times to remove the excess (weakly adsorbed) iron(III), which was followed by drying the paper substrate in air at room temperature.…”

Section: Functionalization Of Filter Papermentioning

confidence: 99%

“…With the introduction of better molecular receptors, new membrane materials and novel sensing concepts, the performance of ISEs has been dramatically improved during the past two decades [3,4]. A number of ISEs are available with high enough selectivity towards the target analyte to be applied in clinical-, process-and environmental analysis.…”

Section: Introductionmentioning

confidence: 99%

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Ding

Lisak

et al. 2017

Sensors and Actuators B: Chemical

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a b s t r a c tThis work demonstrates a paper-based microfluidic sampling and separation platform that allows potentiometric sensing of chloride ions in presence of strongly interfering salicylate ions using a solid-contact ion-selective electrode as a detector. The device was composed of two pieces of paper with different shapes and pore sizes. A "T" shaped filter paper with a pore size of 12-25 m was used as the detection zone. A filter paper with a pore size of 2.0 m was modified with a complexing agent (Fe 3+ ) and served as the separation zone. The two pieces of the paper were joined together just like a jigsaw. A solid-contact Cl − −selective electrode and a reference electrode were gently pressed onto the detection zone to create a direct contact between the electrodes and the solution absorbed in the paper. Utilizing the possibility to form stable complexes between Fe 3+ and salicylate, the proposed platform enables the separation of salicylate and detection of chloride. This system offers a convenient platform for both sampling and separation of ions, in which sample pretreatment procedures can be simplified or avoided.

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“…43 Stability was defined as the ability of the reference electrode to maintain at a constant potential within a certain time period. 44 The reference electrodes were immersed in two types of solutions: 10 −3 M potassium chloride (KCl) solution and buffer solution with pH 7 for a continuous measurement of 60 h. Figure 5 shows potential response measurement of reference electrodes versus time.…”

Section: Drift Studymentioning

confidence: 99%

Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

Alva¹,

Aziz²,

Syono³

et al. 2017

JPS

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Electroanalysis with Membrane Electrodes and Liquid–Liquid Interfaces

Cited by 100 publications

References 200 publications

Cleaning of pH Selective Electrodes with Ionophore‐doped Fluorous Membranes in NaOH Solution at 90 °C

Cleaning of pH Selective Electrodes with Ionophore‐doped Fluorous Membranes in NaOH Solution at 90 °C

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

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