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.

Determination of choline and derivatives with a solid-contact ion-selective electrode based on octaamide cavitand and carbon nanotubes

2009 ◽  
Vol 25 (2) ◽  
pp. 344-349 ◽  
Author(s):  
Jordi Ampurdanés ◽  
Gastón A. Crespo ◽  
Alicia Maroto ◽  
M. Angeles Sarmentero ◽  
Pablo Ballester ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ion Selective Electrode ◽  
Solid Contact ◽  
Selective Electrode

Development of a Graphene Paper-Based Flexible Solid-Contact Lead Ion-Selective Electrode and its Application in Water

2019 ◽  
Vol 62 (2) ◽  
pp. 245-252 ◽  
Author(s):  
Yao Yao ◽  
Yibin Ying ◽  
Jianfeng Ping
Keyword(s):  
Metal Ion ◽  
Water Layer ◽  
Potentiometric Sensor ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Solid Contact ◽  
Selective Electrode ◽  
Filtration Method ◽  
Selective Membrane ◽  
Graphene Paper

Abstract. A graphene paper-based flexible solid-contact ion-selective electrode (SC-ISE) was developed to detect lead ion sensitively. Graphene paper obtained via a simple vacuum filtration method was used as the electrode substrate for direct coating of an ion-selective membrane. The Nernstian slope of the prepared paper-based potentiometric sensor toward lead ion detection was demonstrated as 29.4 mV per decade. A detection limit as low as 2.5 × 10-7 mol L-1 was achieved. Reversed chronopotentiometry and water layer test revealed that the graphene paper-based SC-ISE possessed excellent potential stability because of the hydrophobicity of graphene paper. Furthermore, reliable data were obtained from the detection of lead ion levels in real water samples using the graphene paper-based potentiometric sensor, which shows great potential in practical application. Keywords: Graphene paper, Heavy metal, Ion-selective electrode, Potentiometry, Water sample.

scholarly journals DIANTIPYRYLPROPYLMETHANE AS ELECTRODE-ACTIVE COMPONENTS OF MEMBRANE OF LEAD SELECTIVE ELECTRODE

2018 ◽  
Vol 61 (2) ◽  
pp. 23
Author(s):  
Sarizhat D. Tataeva ◽  
Arsen Sh. Ramazanov ◽  
Victoriya S. Magomedova ◽  
Kurban E. Magomedov ◽  
Ruslan Z. Zeynalov
Keyword(s):  
Copper Ions ◽  
Ion Selective Electrode ◽  
Membrane Composition ◽  
Active Components ◽  
Selective Electrode ◽  
Zinc Cadmium ◽  
Potentiometric Analysis ◽  
The Stability ◽  
Membrane Components

The possibility of approbation of an ion-selective electrode based on diantipyrylpropylmethane for determination of lead is considered in the work. Optimization of the membrane composition of an ion-selective electrode was carried out with the change of weight ratios of membrane components. The best results were obtained with the addition of potassium tetraphenylborate by weight of 1.35%. According to the obtained experimental steepness, a membrane of composition (wt.%) was chosen: PVC (32.62), o-PFOE (65.25), DAPPM (1.35), NaTPB (0.78). The linearity interval of the electrode with an optimized composition of the membrane was observed in the concentration range of 10-6 -10-1 M, with a response of 10 s. The slope of the Pb-SE function is 27.4 ± 0.5 mV / pC. The influence of the acidity of the medium on the Pb-SE response was studied. At the pH=3-5 a potential of the Pb-SE for the compositions remains stable with a drift not more than 2 mV. For a given electrode, the selectivity coefficients were determined by the method of bionic potentials with respect to some d-elements, as well as alkaline and alkaline-earth metals. The influence of zinc, cadmium, mercury and copper ions on the membrane response is significant, which requires the use of various masking reagents in potentiometric analysis in the presence of these ions. To increase the selectivity of the membrane to lead ions, 0.1 M NH4SCN was introduced into the solution under analysis to bind Cu (II), Zn (II), Hg (II) and Cd (II) ions to stronger ammonium complexes. The proposed electrode favorably differs by the interval of the determined concentrations (M) - 10-6 - 10-1; high selectivity, and also increases in the stability of the membrane due to high lipophilicity relative to diantipyrylmethane.Forcitation:Tataeva S.D., Ramazanov A.Sh., Magomedova V.S., Magomedov K.E., Zeynalov R.Z. Diantipyrylpropylmethane as electrode-active components of membrane of lead selective electrode. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 2. P. 23-28

scholarly journals A miniaturized solid-contact potentiometric multisensor platform for determination of ionic profiles in human saliva

2019 ◽  
Vol 23 (12) ◽  
pp. 3299-3308 ◽  
Author(s):  
Marcin Urbanowicz ◽  
Dorota G. Pijanowska ◽  
Artur Jasiński ◽  
Marcin Ekman ◽  
Maria K. Bocheńska
Keyword(s):  
Biomedical Research ◽  
Electrode Surface ◽  
Intermediate Layer ◽  
Gold Electrode ◽  
Human Saliva ◽  
Ion Selective Electrodes ◽  
Solid Contact ◽  
Selective Membrane ◽  
Metrological Parameters

Abstract This paper describes a miniaturized multisensor platform (MP-ISES) consisting of electrodes: a reference one (RE) and ion-selective electrodes (ISEs) for monitoring Na+, K+, Ca2+, Mg2+, Cl−, and SCN− ions and pH in human saliva. Gold electrode surface was modified by deposition of two layers: electrosynthesized PEDOT:PSS forming an intermediate layer, and ion-selective membrane. The developed ISEs were characterized by a wide linear range and sensitivity consistent with the Nernst model. The entire MP-ISEs are characterized by satisfactory metrological parameters demonstrating their applicability in biomedical research, in particular in measurements concerning determination of ionic profiles of saliva. Saliva samples of 18 volunteers aged from 20 to 26 participating in a month experiment had been daily collected and investigated using the MP-ISEs assigned individually to each person. Personalized profiles of ions (ionograms) in saliva, such as Na+, K+, Ca2+, Mg2+, Cl−, SCN−, and H+, were obtained.

scholarly journals Rapid determination of trace level copper in tea infusion samples by solid contact ion selective electrode

2016 ◽  
Vol 24 (3) ◽  
pp. 485-492 ◽  
Author(s):  
Aysenur Birinci ◽  
Hilal Eren ◽  
Fatih Coldur ◽  
Emine Coskun ◽  
Muberra Andac
Keyword(s):  
Rapid Determination ◽  
Ion Selective Electrode ◽  
Solid Contact ◽  
Selective Electrode ◽  
Trace Level ◽  
Tea Infusion

Titration of sulphates and lead using lead ion selective electrode

1981 ◽  
Vol 46 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Josef Veselý
Keyword(s):  
Ionic Strength ◽  
Electrode Surface ◽  
Salt Content ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Selective Electrode ◽  
Limit Of Determination ◽  
Total Salt Content ◽  
Automatic Titration

Titration of sulphates with lead perchlorate employing lead ion selective electrode indication was studied using additions of various organic solvents at different pH' and ionic strength values. As the optimum emerged systems with 60-70% 1,4-dioxane, pH' 5.3-5.6. After dehydration with sodium hydroxide, dioxane must be freed from the electrode surface-oxidizing impurities by their reduction with sodium metal and subsequent distillation. The method was applied to determination of sulphates in mountain spring waters. Units of ppm can be determined; the limit of determination, however, depends considerably on the content of dioxane, total salt content in the sample, and speed of the semi-automatic titration. Lead can be determined with EDTA in concentrations down to c(Pb2+) = 5 . 10-6 mol l-1.

scholarly journals Using MoS2/Fe3O4 as Ion-Electron Transduction Layer to Manufacture All-Solid-State Ion-Selective Electrode for Determination of Serum Potassium

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 155
Author(s):  
Yan Su ◽  
Ting Liu ◽  
Caiqiao Song ◽  
Aiqiao Fan ◽  
Nan Zhu ◽  
...  
Keyword(s):  
High Performance ◽  
Accurate Determination ◽  
Water Layer ◽  
Ion Selective Electrode ◽  
Potential Response ◽  
Selective Electrode ◽  
Response Measurement ◽  
Long Term Stability

As an essential electrolyte for the human body, the potassium ion (K+) plays many physiological roles in living cells, so the rapid and accurate determination of serum K+ is of great significance. In this work, we developed a solid-contact ion-selective electrode (SC-ISE) using MoS2/Fe3O4 composites as the ion-to-electron transducer to determine serum K+. The potential response measurement of MoS2/Fe3O4/K+-ISE shows a Nernst response by a slope of 55.2 ± 0.1 mV/decade and a low detection limit of 6.3 × 10−6 M. The proposed electrode exhibits outstanding resistance to the interference of O2, CO2, light, and water layer formation. Remarkably, it also presents a high performance in potential reproducibility and long-term stability.

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