scholarly journals All Solid-State Poly (Vinyl Chloride) Membrane Potentiometric Sensor Integrated with Nano-Beads Imprinted Polymers for Sensitive and Rapid Detection of Bispyribac Herbicide as Organic Pollutant

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 712 ◽  
Author(s):  
Nashwa Abdalla ◽  
Maha Youssef ◽  
H. Algarni ◽  
Nasser Awwad ◽  
Ayman Kamel
Keyword(s):  
Solid State ◽  
Electrochemical Impedance ◽  
Organic Pollutant ◽  
Solid Substrate ◽  
Hplc Method ◽  
Potentiometric Sensors ◽  
Pvc Membrane ◽  
Aliquat 336 ◽  
Solid Contact ◽  
Selective Membrane

All-solid-state potentiometric sensors were prepared by using polyaniline (PANI) as the solid contact material. A film of PANI (thickness approximately being 0.25 µm) was deposited on a solid substrate (carbon screen printed platform). The PANI layer was subsequently coated with an ion-selective membrane (ISM) containing uniform-sized molecularly imprinted nanoparticles to produce a solid-contact ion-selective electrode (SC/ISE) for bispyribac herbicide (sensor I). In addition, aliquat 336 was also used as an ion exchanger in plasticized PVC membrane (sensor II). The proposed sensors revealed a remarkably improved sensitivity towards bispyribac ions with anionic slopes of −47.8 ± 1.1 (r2 = 0.9995) and −44.4 ± 1.4 (r2 = 0.9997) mV/decade over a linear range 1.0 × 10−2–8.6 × 10−6 M, 1.0 × 10−2–9.0 × 10−6 M and detection limits of 1.33 and 1.81 µg/mL for sensors I and II, respectively.Selectivity of both sensors is significantly high for different common pesticides and inorganic anions. The potential stability of the SC/ISEs was studied using chronopotentiometry. Electrochemical impedance spectrometry was used to understand the charge-transfer mechanisms of the different types of ion-selective electrodes studied. The impedance response of the electrodes was modelled by using equivalent electrical circuits. The sensors were used for a direct measurement of the bispyribac content in commercial herbicide formulations and soil samples collected from agricultural lands planted with rice and sprayed with bispyribac herbicide. The results agree fairly well with data obtained using HPLC method.

scholarly journals Screen-printed Microsensors Using Polyoctyl-thiophene (POT) Conducting Polymer As Solid Transducer for Ultratrace Determination of Azides

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1392 ◽  
Author(s):  
Ahmed Galal Eldin ◽  
Abd El-Galil E. Amr ◽  
Ayman H. Kamel ◽  
Saad S. M. Hassan
Keyword(s):  
Electrochemical Impedance ◽  
Measurement Techniques ◽  
Potentiometric Sensors ◽  
Constant Current ◽  
Pvc Membrane ◽  
Contact Material ◽  
Solid Contact ◽  
Azide Ion ◽  
Screen Printed

Two novel all-solid-state potentiometric sensors for the determination of azide ion are prepared and described here for the first time. The sensors are based on the use of iron II-phthalocyanine (Fe-PC) neutral carrier complex and nitron-azide ion-pair complex (Nit-N3−) as active recognition selective receptors, tetradodecylammonium tetrakis(4-chlorophenyl) borate (ETH 500) as lipophilic cationic additives and poly(octylthiophene) (POT) as the solid contact material on carbon screen-printed devices made from a ceramic substrate. The solid-contact material (POT) is placed on a carbon substrate (2 mm diameter) by drop-casting, followed, after drying, by coating with a plasticized PVC membrane containing the recognition sensing complexes. Over the pH range 6-9, the sensors display fast (< 10 s), linear potentiometric response for 1.0 × 10−2–1.0 × 10−7 M azide with low detection limit of 1.0 × 10−7 and 7.7 × 10−8 M (i.e., 6.2–4.8 ng/ml) for Fe-PC/POT/and Nit-N3−/POT based sensors, respectively. The high potential stability and sensitivity of the proposed sensors are confirmed by electrochemical impedance spectroscopy (EIS) and constant-current chronopotentiometry measurement techniques. Strong membrane adhesion and absence of delamination of the membrane, due to possible formation of a water film between the recognition membranes and the electron conductor are also verified. The proposed sensors are successfully applied for azide quantification in synthetic primer mixture samples. Advantages offered by these sensors are the robustness, ease of fabrication, simple operation, stable potential response, high selectivity, good sensitivity and low cost.

scholarly journals Beryllium-Ion-Selective PEDOT Solid Contact Electrode Based on 9,10-Dinitrobenzo-9-Crown-3-Ether

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6375
Author(s):  
Junghwan Kim ◽  
Dae Hee Kim ◽  
Jin Cheol Yang ◽  
Jae Sang Kim ◽  
Ji Ha Lee ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Constant Current ◽  
Solid Contact ◽  
Response Characteristics ◽  
Best Response ◽  
Wide Ph Range ◽  
Selective Membrane ◽  
Nernstian Slope ◽  
Ph Range ◽  
Contact Electrode

A beryllium(II)-ion-selective poly(ethylenedioxythiophene) (PEDOT) solid contact electrode comprising 9,10-dinitrobenzo-9-crown-3-ether was successfully developed. The all-solid-state contact electrode, with an oxygen-containing cation-sensing membrane combined with an electropolymerized PEDOT layer, exhibited the best response characteristics. The performance of the constructed electrode was evaluated and optimized using potentiometry, conductance measurements, constant-current chronopotentiometry, and electrochemical impedance spectroscopy (EIS). Under optimized conditions, which were found for an ion-selective membrane (ISM) composition of 3% ionophore, 30% polyvinylchloride (PVC), 64% o-nitro phenyl octyl ether (o-NPOE), and 3% sodium tetraphenylborate (NaTPB), the fabricated electrode exhibited a good performance over a wide concentration range (10−2.5–10−7.0 M) and a wide pH range of 2.0–9.0, with a Nernstian slope of 29.5 mV/D for the beryllium (II) ion and a detection limit as low as 10−7.0 M. The developed electrode shows good selectivity for the beryllium(II) ion over alkali, alkaline earth, transition, and heavy metal ions.

scholarly journals Novel Solid-State Potentiometric Sensors Using Polyaniline (PANI) as A Solid-Contact Transducer for Flucarbazone Herbicide Assessment

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1796 ◽  
Author(s):  
Kamel ◽  
Amr ◽  
Abdalla ◽  
El-Naggar ◽  
Al-Omar ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Potentiometric Sensors ◽  
Carbon Substrate ◽  
Pani Film ◽  
Solid Contact ◽  
Ion Sensing ◽  
Glassy Carbon Substrate ◽  
Contact Transducer ◽  
Charged Carrier ◽  
Liquid Chromatographic

Novel potentiometric solid-contact ion-selective electrodes (SC/ISEs) based on molecularly imprinted polymers (MIPs) as sensory carriers (MIP/PANI/ISE) were prepared and characterized as potentiometric sensors for flucarbazone herbicide anion. However, aliquat S 336 was also studied as a charged carrier in the fabrication of Aliquat/PANI/ISEs for flucarbazone monitoring. The polyaniline (PANI) film was inserted between the ion-sensing membrane (ISM) and the electronic conductor glassy carbon substrate (GC). The sensors showed a noticeable response towards flucarbazone anions with slopes of −45.5 ± 1.3 (r2 = 0.9998) and −56.3 ± 1.5 (r2 = 0.9977) mV/decade over the range of 10−2–10−5, 10−2–10−4 M and detection limits of 5.8 × 10−6 and 8.5 × 10−6 M for MIP/PANI/ISE and Aliguat/PANI/ISE, respectively. The selectivity and long-term potential stability of all presented ISEs were investigated. The short-term potential and electrode capacitances were studied and evaluated using chronopotentiometry and electrochemical impedance spectrometry (EIS). The proposed ISEs were introduced for the direct measurement of flucarbazone herbicide in different soil samples sprayed with flucarbazone herbicide. The results agree well with the results obtained using the standard liquid chromatographic method (HPLC).

scholarly journals All-Solid-State Ion-Selective Electrodes Based on Graphite Paste for Determination of Calcium(II) and Nitrate

2019 ◽  
Vol 11 (2) ◽  
pp. 156
Author(s):  
Johannes Schwarz ◽  
Ute Enseleit ◽  
Kathrin Trommer ◽  
Michael Mertig
Keyword(s):  
Solid State ◽  
Reference Method ◽  
Well Water ◽  
Ion Selective Electrodes ◽  
Solid Contact ◽  
Diglycolic Acid ◽  
Nitrate N ◽  
Selective Membrane ◽  
Pvc Membranes

Robust and easy-to-handle ion-selective electrodes in all-solid-state configurations based on graphite paste have been developed for applications in environmental samples. The electrode consists of different functional layers (graphite paste, conducting polymer, ion-selective membrane). The ion-selective compounds have been incorporated in polyvinylchloride (PVC) membranes. Polypyrrole (PPy) acts as a solid contact and an intermediate layer between the ion-selective membrane and the graphite paste. As ion-complexing compounds tridodecylmethylammonium nitrate (TDMA-NO3) for nitrate, N,N,N&rsquo;,N&rsquo;-tetra[cyclohexyl]diglycolic acid diamide and N,N-dicyclohexyl-N&lsquo;,N&lsquo;-dioctadecyl-diglycolic diamide for calcium(II) determinations have been used. The electrodes have been tested in drinking and well water samples by direct potentiometric determination and by titrations. The results have been compared to ion chromatography as the reference method. Both ion selective electrodes exhibit linear response from 10-5 mol/L to 10-1 mol/L respectively. The detection limits for the target ions are below 10-6 mol/L based on the respective ion.

All-solid-state potentiometric sensors for ascorbic acid by using a screen-printed compatible solid contact

2004 ◽  
Vol 502 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Panayotis G. Veltsistas ◽  
Mamas I. Prodromidis ◽  
Constantinos E. Efstathiou
Keyword(s):  
Ascorbic Acid ◽  
Solid State ◽  
Potentiometric Sensors ◽  
Solid Contact ◽  
Screen Printed

scholarly journals Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 259
Author(s):  
Nikola Lenar ◽  
Robert Piech ◽  
Jan Wyrwa ◽  
Beata Paczosa-Bator
Keyword(s):  
Electrochemical Impedance ◽  
Light Exposure ◽  
Water Film ◽  
Water Layer ◽  
Linear Range ◽  
Solid Contact ◽  
Iridium Dioxide ◽  
Potentiometric Response ◽  
Coated Disc ◽  
Selective Membrane

This work presents new material for solid-contact layers—hydrous iridium dioxide IrO2·2H2O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remarkable electrical parameters of layers resulted in great analytical parameters of IrO2·2H2O-contacted potassium-selective electrodes. Various parameters of ion-selective electrodes were examined in the scope of this work using a potentiometry method including: linear range, repeatability, stability of potentiometric response and sensitivity to varying measurement conditions. The analytical parameters obtained for solid-contact electrodes were compared with the ones obtained for coated disc electrodes to evaluate the influence of the iridium dioxide layer. The linear range of the IrO2·2H2O-contacted K+-selective electrodes covered concentrations of K+ ions from 10−6 to 10−1 M and the potential stability was estimated at 0.097 mV/h. The IrO2·2H2O-contacted electrodes turned out to be insensitive to varying light exposure and changes in the pH values of measured solutions (in the pH range of 2 to 10.5). A water layer test proved that, contrary to the coated disc electrode, the substantial water film is not formed between the ion-selective membrane and iridium dioxide layer.

scholarly journals Application of polyaniline nanofibers for the construction of nitrate all-solid-state ion-selective electrodes

2021 ◽  
Author(s):  
Karolina Pietrzak ◽  
Cecylia Wardak ◽  
Szymon Malinowski
Keyword(s):  
Electrochemical Impedance ◽  
Fast Response ◽  
Point Of View ◽  
Ion Selective Electrodes ◽  
Solid Contact ◽  
Measuring Range ◽  
Polyaniline Nanofibers ◽  
Vis Spectroscopy ◽  
Selective Membrane ◽  
Nitrate Determination

AbstractThe application of polyaniline nanofibers doped with chloride and nitrate ions (PANINFs-Cl and PANINFs-NO3) in potentiometry was described. Both kinds of nanofibers were used as an ion-to-electron transducer in ion-selective electrodes with solid contact (SCISEs). Extensive research on the properties of the nanofibers themselves (SEM, UV–Vis spectroscopy, FTIR) and the constructed electrodes (potentiometric methods, electrochemical impedance spectroscopy) has been carried out. Basic analytical parameters of electrodes containing various nanofibers contents in the ion-selective membrane and with nanofibers as an intermediate layer were determined. It was found that application of PANI nanofibers resulted in improvement of electrode performance (among others, better stability and reversibility of the electrode potential). The obtained sensors were characterized by a high slope of the calibration curve, a wide measuring range and a fast response time. Moreover, they were insensitive to change of redox potential, as well as light and the presence of oxygen in the solution, what is important from a practical point of view. They were also successfully used for nitrate determination in real environmental samples.

scholarly journals Potentiometric Solid-Contact Ion-Selective Electrode for Determination of Thiocyanate in Human Saliva

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2817
Author(s):  
Marcin Urbanowicz ◽  
Kamila Sadowska ◽  
Dorota G. Pijanowska ◽  
Radosław Pomećko ◽  
Maria Bocheńska
Keyword(s):  
Daily Basis ◽  
Human Saliva ◽  
Ion Selective Electrode ◽  
Potentiometric Sensors ◽  
Membrane Composition ◽  
Solid Contact ◽  
Selective Electrode ◽  
Selective Membrane ◽  
Selection Of

A new solid-contact potentiometric ion-selective electrode for the determination of SCN− (SCN-ISE) has been described. Synthesized phosphonium derivative of calix[4]arene was used as a charged ionophore. The research included selection of the ion-selective membrane composition, determination of the ISEs metrological parameters and SCN-ISE application for thiocyanate determination in human saliva. Preparation of the ISEs included selection of a plasticizer for the ion-selective membrane composition and type of the electrode material. The study was carried out using ISE with liquid internal electrolyte (LE-ISE) and solid-contact electrodes made of glassy carbon (GC-ISE) and gold rods (Au-ISE). The best parameters were found for GC sensors for which the ion-selective membrane contained chloroparaffin as a plasticizer (S = 59.9 mV/dec, LOD = 1.6 × 10−6 M). The study of potentiometric selectivity coefficients has shown that the thiocyanate-selective sensor could be applied in biomedical research for determination of SCN− concentration in human saliva. The accuracy of the SCN− determination was verified by testing 59 samples of volunteers’ saliva by potentiometric sensors and UV-Vis spectrophotometry as a reference technique. Moreover, SCN− concentrations in the smokers’ and non-smokers’ saliva were compared. In order to investigate the influence of various factors (sex, health status, taken medications) on the thiocyanate level in the saliva, more extensive studies on a group of 100 volunteers were carried out. Additionally, for a group of 18 volunteers, individual profiles of SCN− concentration in saliva measured on a daily basis for over a month were collected.

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