<i>Ammonium Ion Selective Electrode Response in Swine Urine Solutions</i>

2018 ◽  
Author(s):  
Alison V. Deviney ◽  
John J. Classen ◽  
J. Mark Rice ◽  
Dean L. Hesterberg
Keyword(s):  
Ion Selective Electrode ◽  
Ammonium Ion ◽  
Selective Electrode ◽  
Electrode Response ◽  
Swine Urine

Reagentless determination of L-asparagine and L-arginine via the combined use of immobilized enzymes and an ion-selective electrode

1976 ◽  
Vol 54 (1) ◽  
pp. 62-65 ◽  
Author(s):  
That Tjien Ngo
Keyword(s):  
Immobilized Enzymes ◽  
Ion Selective Electrode ◽  
Ammonium Ion ◽  
Selective Electrode ◽  
New Methods ◽  
Potentiometric Response ◽  
Electrode Response ◽  
Combined Use ◽  
Hydrolysis Of

New methods for the determination of L-asparagine and arginine are described. Solutions containing L-asparagine were pumped through an asparaginase tube, which catalyzed the hydrolysis of L-asparagine to L-aspartic acid and ammonium ion. For L-arginine determination, solutions containing L-arginine were pumped through an arginase–urease tube. This dual enzyme tube catalyzed the conversion of L-arginine to L-ornithine, carbon dioxide, and ammonium ion. The ammonium ion concentrations in the effluent of the enzyme tubes were determined quantitatively by an ammonium-ion-selective electrode. The potentiometric response of the electrode was directly proportional to the logarithm of the concentration of L-asparagine and L-arginine in the range of 0.1–50 mM. An equation relating the electrode response and the substrate concentration is derived.

A Solid Ammonium Ion Selective Electrode

1970 ◽  
Vol 3 (9) ◽  
pp. 457-464 ◽  
Author(s):  
R. E. Cosgrove ◽  
C. A. Mask ◽  
I. H. Krull
Keyword(s):  
Ion Selective Electrode ◽  
Ammonium Ion ◽  
Selective Electrode

scholarly journals Simultaneous Analysis of Ammonium and Nitrate Ions Levels with Potentiometric Multi-commutation Flow System Method

2021 ◽  
Vol 22 (1) ◽  
pp. 69
Author(s):  
Fajrin Nurul Hikmah ◽  
Tri Mulyono ◽  
Zulfikar Zulfikar
Keyword(s):  
Detection Limit ◽  
Flow System ◽  
Ion Selective Electrode ◽  
Ammonium Ion ◽  
Selective Electrode ◽  
Nitrate Ion ◽  
Nitrate Ions ◽  
Limit Value ◽  
System Method ◽  
Recovery Percentage

This study aims to develop a multi-commutation flow system method for simultaneous determination of ammonium ion and nitrate ion using two detectors, namely ammonium ion selective electrode and nitrate ion selective electrode. The multi-commutation flow system method uses two three way selenoide valves to adjust the sample flow and ISA solution. The selenoid valve alternately flows the sample and ISA solution to the ion selective electrode. Flow control by three way selenoid valves is controlled by LabView which is programmed in the computer. The computer is connected with Arduino and a relay that functions as an on-off switch on the three way valve selenoid. This method is then applied to measure the levels of ammonium ions and nitrate ions in well water samples. The performance of the multi-commutation flow system determined includes linearity, limit detection, sensitivity, repeatability, and recovery test. Ammonium analysis results show good performance with several criteria. Ammonium linearity value is 0,9991, ammonium detection limit value is 2,23 × 10-5 M, sensitivity of ion selective electrode ammonium is 45,39 mV per decade, the repeability value is less than 2% and the recovery percentage of ammonium is 115%. While the results of the nitrate analysis showed a linearity value of 0,9937, a nitrate detection limit value of 1,31 × 10-5 M, sensitivity of the ion selective electrode nitrate of -110,58 mV per decade, a repeatability value of less than 2% and a recovery percentage of 87% nitrate. Keywords: Flow Analysis, multi-commutation, ammonium, nitrat, simultaneous.

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