Amperometry with two polarisable electrodes. I. Chelometric determination of iron(III) with Pt-Pt electrode system indication

1965 ◽  
Vol 30 (12) ◽  
pp. 4272-4279 ◽  
Author(s):  
J. Vorlíček ◽  
F. Vydra
Keyword(s):  
Electrode System ◽  
Pt Electrode

scholarly journals Conductimetric Biosensor for the Detection of Uric Acid by Immobilization Uricase on Nata de Coco Membrane—Pt Electrode

2011 ◽  
Vol 6 ◽  
pp. ACI.S7346 ◽  
Author(s):  
Ani Mulyasuryani ◽  
Arie Srihardiastutie
Keyword(s):  
Uric Acid ◽  
Human Serum ◽  
Candida Utilis ◽  
Medical Laboratory ◽  
Membrane Thickness ◽  
Serum Samples ◽  
Ph Change ◽  
Pt Electrode ◽  
Enzyme Biosensor

A conductimetric enzyme biosensor for uric acid detection has been developed. The uricase, as enzyme, is isolated from Candida utilis and immobilized on a nata de coco membrane-Pt electrode. The biosensor demonstrates a linear response to urate over the concentration range 1-6 ppm and has good selectivity properties. The response is affected by the membrane thickness and pH change in the range 7.5-9.5. The response time is three minutes in aqueous solutions and in human serum samples. Application of the biosensor to the determination of uric acid in human serum gave results that compared favourably with those obtained by medical laboratory. The operational stability of the biosensor was not less than three days and the relative error is smaller than 10%.

NaCl and CaCl2 activity coefficients in mixed aqueous solutions

1965 ◽  
Vol 20 (6) ◽  
pp. 1332-1336 ◽  
Author(s):  
Edward W. Moore ◽  
James W. Ross
Keyword(s):  
Ionic Strength ◽  
Activity Coefficients ◽  
Technical Assistance ◽  
Osmotic Coefficients ◽  
Electrode System ◽  
Glass Electrode ◽  
Concentration Data ◽  
Harned's Rule ◽  
Potentiometric Measurement

In the investigation of numerous physiological phenomena it is the activity of an ion species which is desired, rather than stoichiometric concentration. The calculation of mean ionic activity from known concentration data requires accurate activity coefficients (ggr). This report concerns the determination of ggrNaCl and ggrCaCl2 in mixed NaCl-CaCl2 solutions by potentiometric measurement with a sodium-selective glass electrode-Ag/AgCl electrode system over the ionic strength range 0.05–0.5 m. Log ggrNaCl varied linearly, at constant total ionic strength, with the ionic strength of CaCl2 in the mixture, in accordance with Harned's rule. From data thus obtained, ggrCaCl2 coefficients in such mixed solutions have been calculated and compared with values calculated from published osmotic data. Resulting activity coefficient curves for ggrCaCl2 are presented over the concentration range encountered in serum and other extracellular fluids. Note: (With the Technical Assistance of Leonard Kaye and Leonard L. Anderson) glass electrodes; ion interaction; electrolyte metabolism; Harned's rule; membrane transport; osmotic coefficients Submitted on March 11, 1965

Electrochemical Conversion of Methanol and Carbon Dioxide to Dimethyl Carbonate at Graphite-Pt Electrode System

2012 ◽  
Vol 159 (12) ◽  
pp. E183-E186 ◽  
Author(s):  
Xin Yuan ◽  
Bin Lu ◽  
Jiazhe Liu ◽  
Xuelin You ◽  
Jingxiang Zhao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Dimethyl Carbonate ◽  
Electrode System ◽  
Pt Electrode ◽  
Electrochemical Conversion

scholarly journals Determination of L-Ascorbic Acid in Green Tea with an Enzyme Reactor Electrode System.

1996 ◽  
Vol 43 (6) ◽  
pp. 668-673
Author(s):  
Hirokazu OKUMA ◽  
Hitoshi TAKAHASHI ◽  
Seiichi YAZAWA ◽  
Shizuko HORIKE ◽  
Ryoichi AKAHOSHI
Keyword(s):  
Ascorbic Acid ◽  
Green Tea ◽  
Electrode System ◽  
Enzyme Reactor

Conductometric determination of the uncompensated resistance in a three-electrode system

1980 ◽  
Vol 52 (6) ◽  
pp. 998-999 ◽  
Author(s):  
Naphtali. Klein ◽  
Chaim. Yarnitzky
Keyword(s):  
Electrode System

scholarly journals Determination of Fish Freshness with an Enzyme Reactor Electrode System.

1991 ◽  
Vol 38 (11) ◽  
pp. 1019-1024 ◽  
Author(s):  
Hirokazu OKUMA ◽  
Hitoshi TAKAHASHI ◽  
Shuichi SEKIMUKAI ◽  
Etsuo WATANABE
Keyword(s):  
Electrode System ◽  
Enzyme Reactor

Lab-on-a-Chip Device for Hydrogen Sulfide Sensing in Biomedical and Environmental Applications Using Electrochemical Approach

2015 ◽  
Author(s):  
A. Baniya ◽  
S. Thapa ◽  
E. Borquist ◽  
D. Bailey ◽  
D. Wood ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Direct Detection ◽  
Sulfide Oxidation ◽  
Lab On A Chip ◽  
Electrode System ◽  
Sulfide Concentration ◽  
Pt Electrodes ◽  
Electrochemical Approach ◽  
And Performance

Hydrogen sulfide (H2S) is rapidly emerging as a biologically significant signaling molecule. In recent studies, sulfide level in blood or plasma has been reported to be in the concentration between 10 and 300 μM suggesting it acts in various diseases. This work reports progress on a new Lab-on-a-Chip (LOC) device for these applications. The uniquely designed, hand-held device uses advanced liberation chemistry that releases H2S from liquid sample and an electrochemical approach to detect sulfide concentration from the aqueous solution. The device itself consists of three distinct layers of Polydimethylsiloxane (PDMS) structures and a three electrode system for direct and rapid H2S concentration measurement. In this work specifically, the oxidation of sulfide at the gold (Au) and platinum (Pt.) electrodes has been examined. This is the first known application of electrochemical H2S sensing in an LOC application. The analytical utility and performance of the device has been assessed through direct detection using chronoamperometry (CA) scan and cyclic voltammetry (CV). An electrocatalytic sulfide oxidation signal has been recorded for sulfide concentration range vs, Ag/AgCl at different pH buffers at the trapping chamber. The calibration curve in the range 1 μM to 1 M was obtained using this electrode setup. The detection limit was found to be 0.1 μM. This device shows promise for providing fast and inexpensive determination of H2S concentration in aqueous samples.

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