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 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.

All-solid-state blood calcium sensors based on screen-printed poly(3,4-ethylenedioxythiophene) as the solid contact

2012 ◽  
Vol 173 ◽  
pp. 630-635 ◽  
Author(s):  
You Wang ◽  
Hui Xu ◽  
Xiaoxi Yang ◽  
Zhiyuan Luo ◽  
Jianming Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Solid Contact ◽  
Blood Calcium ◽  
Calcium Sensors ◽  
Screen Printed

Amperometric sensor for L-ascorbic acid determination based on MnO 2 bulk modified screen printed electrode

2000 ◽  
Vol 368 (5) ◽  
pp. 466-470 ◽  
Author(s):  
E. Turkusic ◽  
V. Milicevic ◽  
H. Tahmiscija ◽  
M. Vehabovic ◽  
S. Basic ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Amperometric Sensor ◽  
Screen Printed Electrode ◽  
Ascorbic Acid Determination ◽  
Acid Determination ◽  
Screen Printed

New solvent system for the improved electrochemical performance of screen-printed polyurethane membrane-based solid-state sensors

1996 ◽  
Vol 33 (1-3) ◽  
pp. 168-172 ◽  
Author(s):  
R.W. Hower ◽  
J.H. Shin ◽  
G.S. Cha ◽  
R.K. Meruva ◽  
M.E. Meyerhoff ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Solvent System ◽  
Polyurethane Membrane ◽  
Screen Printed
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