Electrode response of NaFeTiO4 in aqueous supercapacitor cells

Ionics ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 1709-1721
Author(s):  
Biswajit Mandal ◽  
A. K. Thakur
Keyword(s):  
Electrode Response

scholarly journals Selective Membrane Sensor for Aluminum Determination in Food Products, Real Samples and Standard Alloys

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 504
Author(s):  
Sabry Khalil ◽  
Ashraf Y. Elnaggar
Keyword(s):  
Liquid Membrane ◽  
Food Products ◽  
Ion Selective Electrodes ◽  
Real Samples ◽  
Membrane Sensor ◽  
Aluminum Ion ◽  
Electrode Response ◽  
Aluminum Ions ◽  
Selective Membrane ◽  
Ph Range

The study involves the fabrication of an aluminum liquid membrane sensor based on the association of aluminum ions with the cited reagent 2,9-dimethyl-4,11-diphenyl -1,5,8,12-tetraaza cyclote tradeca-1,4,8,11-tetraene [DDTCT]. The characteristics slope (58 mV), rapid and linear response for aluminum ion was displayed by the proposed sensor within the concentration range 2.5 × 10−7–1.5 × 10−1 M, the detection limit (1.6 × 10−7) M, the selectivity behavior toward some metal cations, the response time 10 s), lifetime (150 days), the effect of pH on the suggested electrode potential and the requisite analytical validations were examined. The suitable pH range was (5.0–8.0 ), in this range the proposed electrode response is independent of pH. The suggested electrode was applied to detect the aluminum ions concentration in food products, real samples and standard alloys. The resulting data by the suggested electrode were statistically analyzed, and compared with the previously reported aluminum ion-selective electrodes in the literature.

A method for estimation of urea using ammonia electrode and its applicability to milk samples

2008 ◽  
Vol 75 (4) ◽  
pp. 466-470 ◽  
Author(s):  
Rajan Sharma ◽  
Yudhishthir S Rajput ◽  
Sumandeep Kaur ◽  
Sudhir K Tomar
Keyword(s):  
Carbon Dioxide ◽  
Sodium Azide ◽  
Inverse Relationship ◽  
Ammonium Ion ◽  
Enzymatic Method ◽  
Alkaline Ph ◽  
Milk Samples ◽  
Electrode Response ◽  
Urease Enzyme ◽  
Ammonia Electrode

A method for the estimation of urea in milk using ammonia electrode is described. Urea is first degraded by urease enzyme into ammonium ion and carbon dioxide at neutral pH. The ammonium ion is then converted into ammonia at alkaline pH. A linear inverse relationship was observed between logarithmic concentration of ammonia or urea and electrode response. Repeatability, expressed as a coefficient of variation, was 1·77% at a level of 8·92 mm-urea in milk. The method was validated in milk samples spiked with between 2×10−3 and 10×10−3 m-urea and recovery of added urea was quantitative. Whereas, preservative sodium azide at 0·5 g/l or 2 g/l level did not affect results, lower values of urea concentration in presence of Bronopol at 0·5 g/l were observed. Urea levels in milk samples estimated by this method were comparable to standard enzymatic method. The method is simple, fast and is not prone to interference from other milk constituents.

Automated Fluoride Ion Determination

1977 ◽  
Vol 14 (1-6) ◽  
pp. 269-274 ◽  
Author(s):  
David C. Cowell
Keyword(s):  
Continuous Flow ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Automated Method ◽  
Electrode Response ◽  
Kinetics Of ◽  
Fluoride Ion Selective Electrode ◽  
Flow Techniques

An automated method is described, using standard continuous flow techniques, for the determination of urine fluoride ion concentration using a fluoride ion selective electrode. It is shown that the kinetics of the electrode response to changes in fluoride ion can be used for the accurate measurement of fluoride ion concentration in urine, and that equilibration of the electrode response is not a prerequisite for the measurement of fluoride ion. Recovery experiments are in the range 83 to 90%; in-batch precision is between 0·9 and 1·6% and carryover 2·5% or less.

Ionized calcium in human milk determined with a calcium-selective electrode.

1983 ◽  
Vol 29 (5) ◽  
pp. 858-861 ◽  
Author(s):  
J C Allen ◽  
M C Neville
Keyword(s):  
Ionic Strength ◽  
Human Milk ◽  
Blood Plasma ◽  
Calibration Curve ◽  
Calcium Ion ◽  
Ionized Calcium ◽  
Selective Electrode ◽  
Electrode Response ◽  
Glass Capillaries ◽  
Other Substances

Abstract We measured the concentration of ionized calcium in human milk with a Radiometer ionized calcium analyzer at 37 degrees C. This instrument is designed to use simultaneous outputs from a pH electrode and a calcium ion-selective electrode to obtain the true ionized calcium in blood plasma. Because both the ionic strength and the pH of human milk differ significantly from that of plasma, we used a calibration curve that corrected for these variables. No other substances in milk interfered with the electrode response to Ca2+. The Ca2+ concentration of milk decreased and the pH increased as CO2 was lost to the atmosphere. Samples collected in glass capillaries, which minimized CO2 loss, contained 2.84 (SD 0.56) mmol of Ca2+ per liter at pH 6.98. We emphasize the importance of maintaining physiological CO2 concentrations when Ca2+ is being measured in milk.

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