Polymeric Membrane-modified Voltammetric Sensors for Lipophilic Analytes with Nanomolar Detection Limit: Key Parameters Influencing the Response Characteristics

2021 ◽  
pp. 338642
Author(s):  
Marcin Guzinski ◽  
Ernő Lindner ◽  
Bradford Pendley ◽  
Edward Chaum
Keyword(s):  
Detection Limit ◽  
Polymeric Membrane ◽  
Response Characteristics ◽  
Voltammetric Sensors ◽  
Nanomolar Detection

scholarly journals Potentiometric Carboxylate Sensors Based on Carbazole-Derived Acyclic and Macrocyclic Ionophores

Chemosensors ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 4
Author(s):  
Ville Yrjänä ◽  
Indrek Saar ◽  
Mihkel Ilisson ◽  
Sandip A. Kadam ◽  
Ivo Leito ◽  
...  
Keyword(s):  
Detection Limit ◽  
Vinyl Chloride ◽  
Anion Exchanger ◽  
Linear Range ◽  
Ph Sensitivity ◽  
Ion Selective Electrodes ◽  
Solid Contact ◽  
Response Characteristics ◽  
Potentiometric Response ◽  
Poly Vinyl Chloride

Solid-contact ion-selective electrodes with carbazole-derived ionophores were prepared. They were characterized as acetate sensors, but can be used to determine a number of carboxylates. The potentiometric response characteristics (slope, detection limit, selectivity, and pH sensitivity) of sensors prepared with different membrane compositions (ionophore, ionophore concentration, anion exchanger concentration, and plasticizer) were evaluated. The results show that for the macrocyclic ionophores, a larger cavity provided better selectivity. The sensors exhibited modest selectivity for acetate but good selectivity for benzoate. The carbazole-derived ionophores effectively decreased the interference from lipophilic anions, such as bromide, nitrate, iodide, and thiocyanate. The selectivity, detection limit, and linear range were improved by choosing a suitable plasticizer and by reducing the ionophore and anion exchanger concentrations. The influence of the electrode body’s material upon the composition of the plasticized poly(vinyl chloride) membrane, and thus also upon the sensor characteristics, was also studied. The choice of materials for the electrode body significantly affected the characteristics of the sensors.

Detection limit of polymeric membrane potentiometric ion sensors: how can we go down to trace levels?

1999 ◽  
Vol 397 (1-3) ◽  
pp. 103-111 ◽  
Author(s):  
Yanming Mi ◽  
Sally Mathison ◽  
Roderick Goines ◽  
Alicia Logue ◽  
Eric Bakker
Keyword(s):  
Detection Limit ◽  
Polymeric Membrane ◽  
Ion Sensors ◽  
Potentiometric Ion Sensors

scholarly journals Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium

2018 ◽  
Author(s):  
Divya Singhal ◽  
Neha Gupta ◽  
Ashok Kumar Singh
Keyword(s):  
Detection Limit ◽  
Aqueous Medium ◽  
1H Nmr ◽  
Binding Constant ◽  
High Selectivity ◽  
Good Sensitivity ◽  
Dft Studies ◽  
Nmr Titration ◽  
1H Nmr Titration ◽  
Nanomolar Detection

4-(thiazol-2-yldiazenyl)phenol (L1) and 2-((4-hydroxyphenyl) diazenyl)-5-nitrophenol (L2) based on azo phenol were synthesised and used as selective colorimetric sensor for CN- and AcO− ion in DMSO/H2O-HEPES (v/v; 1:1, pH–7.3 ± 0.2) and showed good sensitivity with large red shifts and nanomolar detection limit for CN- and AcO- ion. The stoichiometry of L1 with CN−/AcO− ion was found to be 1:1 and L2 with CN−/AcO− ion was found to be 1:2. Binding constant for L1+ CN−, L1 + AcO−, L2 + CN− and L2 + AcO− were calculated by B-H plot as 1.6 × 103, 8.0 × 102, 8.4 × 103 and 1.7 × 102 respectively. L2 showed high selectivity towards CN− ion with low detection limit of 81 nM and large binding constant. In addition, 1H NMR titration and DFT studies also supported the deprotonation mechanism of receptors in the presence of selective anions.

Improving the Detection Limit of Anion-Selective Electrodes:  An Iodide-Selective Membrane with a Nanomolar Detection Limit

2003 ◽  
Vol 75 (15) ◽  
pp. 3865-3871 ◽  
Author(s):  
Adam Malon ◽  
Aleksandar Radu ◽  
Wei Qin ◽  
Yu Qin ◽  
Alan Ceresa ◽  
...  
Keyword(s):  
Detection Limit ◽  
Nanomolar Detection ◽  
Selective Membrane

Kinetic study and characterization of a platinum electrode/sensitive membrane for malachite green detection

Sensor Review ◽  
2018 ◽  
Vol 38 (3) ◽  
pp. 335-344 ◽  
Author(s):  
Ilhem Ghodbane ◽  
Rochdi Kherrrat ◽  
Saida Zougar ◽  
Rim Lamari ◽  
Redouane Haddadji ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Kinetic Study ◽  
Linear Relationship ◽  
Correlation Coefficient ◽  
Malachite Green ◽  
Platinum Electrode ◽  
Electrochemical Impedance ◽  
Polymeric Membrane ◽  
Content Type

PurposeThe purpose of this work is to explore electrical properties of an electrochemical sensor designed for the detection of malachite green (MG) present in an aqueous solution.Design/methodology/approachThe present sensor consists in the spatial coupling of a polymeric membrane and an ion-sensitive electrode (platinum electrode). The preparation of the polymeric membrane involves the incorporation of an ionophore (D2HPA), a polymer (polyvinylchloride [PVC]) and a plasticizer (dioctyl phthalate [DOP]). Several techniques have been used to characterize this sensor: the cyclic voltammetry, the electrochemical impedance spectroscopy and the optical microscopy. The sensibility, the selectivity and the kinetic study of a modified platinum electrode have been evaluated by cyclic voltammetry.FindingsThe obtained results reveal the possibility of a linear relationship between the current of reduction peaks and MG concentration. A linear response was obtained in a wide-concentration range that stretches from 10−5to 10−13mol L−1, with a good correlation coefficient (0.976) and a good detection limit of 5.74 × 10−14mol L−1(a signal-to-noise ratio of 3). In addition, the voltammetric response of modified electrode can be enhanced by adding a layer of Nafion membrane. Under this optimal condition, a linear relationship was obtained, with a correlation coefficient of 0.986 and a detection limit of 1.92 × 10−18mol L−1.Originality/valueIn the present research, a convenient, inexpensive and reproducible method for the detection of MG was developed. The developed sensor is capable of competing against the conventional techniques in terms of speed, stability and economy.

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