Association of benflurone in aqueous solutions studied by measuring the activity of chloride ions

1986 ◽  
Vol 51 (11) ◽  
pp. 2437-2443
Author(s):  
František Kopecký ◽  
Mária Vojteková ◽  
Milan Pešák
Keyword(s):  
Aqueous Solutions ◽  
Chloride Ions ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Measured Range

The conventional activity of chloride ions was measured by an ion-selective electrode at 25 °C in aqueous solutions of benflurone, i.e. 5-(2-(N,N-dimethylamino)ethoxy)-7-oxo-7H-benzo(c)fluorene hydrochloride, without or with additions of KCl. These results suggest a gradual association of benflurone; the formation of a hetero-associate, (BH+)2Cl-, followed by higher associates was evaluated in the measured range up to 0.1 mol l-1.

scholarly journals Electrochemical Detection of Electrolytes Using a Solid-State Ion-Selective Electrode of Single-Piece Type Membrane

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 109
Author(s):  
Li-Da Chen ◽  
Wei-Jhen Wang ◽  
Gou-Jen Wang
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Human Serum ◽  
Gold Electrode ◽  
Chloride Ions ◽  
Ion Selective Electrode ◽  
Potassium Ions ◽  
Selective Electrode ◽  
Single Piece ◽  
Sodium And Potassium

This study aimed to develop simple electrochemical electrodes for the fast detection of chloride, sodium and potassium ions in human serum. A flat thin-film gold electrode was used as the detection electrode for chloride ions; a single-piece type membrane based solid-state ion-selective electrode (ISE), which was formed by covering a flat thin-film gold electrode with a mixture of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and ion-selective membrane (ISM), was developed for sodium and potassium ions detection. Through cyclic voltammetry (CV) and square-wave voltammetry (SWV), the detection data can be obtained within two minutes. The linear detection ranges in the standard samples of chloride, sodium, and potassium ions were 25–200 mM, 50–200 mM, and 2–10 mM, with the average relative standard deviation (RSD) of 0.79%, 1.65%, and 0.47% and the average recovery rates of 101%, 100% and 96%, respectively. Interference experiments with Na+, K+, Cl−, Ca2+, and Mg2+ ions demonstrated that the proposed detection electrodes have good selectivity. Moreover, the proposed detection electrodes have characteristics such as the ability to be prepared under relatively simple process conditions, excellent detection sensitivity, and low RSD, and the detection linear range is suitable for the Cl−, Na+ and K+ concentrations in human serum.

Effect of chloride ions on the behaviour of the orion copper(II) ion-selective electrode

Talanta ◽  
1974 ◽  
Vol 21 (10) ◽  
pp. 1094-1098 ◽  
Author(s):  
D.J. Crombie ◽  
G.J. Moody ◽  
J.D.R. Thomas
Keyword(s):  
Chloride Ions ◽  
Ion Selective Electrode ◽  
Selective Electrode

Detection of Electrolytes Based on Solid-State Ion-Selective Electrode

2021 ◽  
Author(s):  
Li-Da Chen ◽  
Gou-Jen Wang
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Human Serum ◽  
Gold Electrode ◽  
Chloride Ions ◽  
Ion Selective Electrode ◽  
Detection Sensitivity ◽  
Potassium Ions ◽  
Selective Electrode ◽  
Sodium And Potassium

Abstract This study aimed to develop simple electrochemical electrodes for the fast detection of chlorine, sodium, and potassium ions in human serum. A flat thin-film gold electrode was used as the detection electrode for chloride ions; a solid-state ion-selective electrode (ISE), which was formed by covering a flat thin-film gold electrode with a mixture of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and ion-selective membrane (ISM), was developed for sodium and potassium ions detection. Through cyclic voltammetry (CV) and square-wave voltammetry (SWV), the detection data can be obtained within two minutes. The linear detection ranges in the standard samples of chlorine, sodium, and potassium ions were 25–200 mM, 50–200 mM, and 2–10 mM, with the average relative standard deviation (RSD) of 0.79%, 1.65%, and 0.47% and the average recovery rates of 101%, 100%, and 96% respectively. Interference experiments using normal concentrations of Na+, K+, Cl−, Ca2+, and Mg2+ in human blood demonstrated that the proposed detection electrodes have good selectivity. Moreover, the proposed detection electrodes have characteristics such as the ability to be prepared under relatively simple process conditions, excellent detection sensitivity, and low RSD, and the detection linear range is suitable for the Cl−, Na+, and K+ concentrations in human serum.

Potentiometric Investigation of the Weak Association of Sodium and Oxalate Ions in Aqueous Solutions at 25°C

2005 ◽  
Vol 58 (3) ◽  
pp. 213 ◽  
Author(s):  
Andrew Tromans ◽  
Glenn Hefter ◽  
Peter M. May
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Infinite Dilution ◽  
Formation Constant ◽  
Ion Pair ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Weak Association ◽  
Tetramethylammonium Chloride ◽  
Good Agreement

The formation constant β(NaOx−) of the extremely weak ion pair formed between sodium (Na+) and oxalate (Ox2−) ions in aqueous solutions has been determined at 25°C as a function of ionic strength in tetramethylammonium chloride by Na+ ion-selective electrode potentiometry. The effects of trace Na+ impurities from all reagents were accounted for. An extrapolated value for β o of 6.6 ± 0.5 M−1 was obtained at infinite dilution, which is in good agreement with literature values. Attempts to measure this constant in 1 M CsCl media gave a β(NaOx−) value of 0.00 ± 0.06 M−1, probably because of competition between Cs+ and Na+ for Ox2−.

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