Journal ArticleDOI
Analysis of Urea Nitrogen in the Presence of Ammonia Using an Ammonia Gas Sensitive Electrode
Darius S. Rogers,Karl H. Pool +1 more
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In this paper, a method for the determination of ammonia and urea in raw sewage samples using an Orion Ammonia Gas-Sensing Electrode was described, where ammonia was determined by potentiometrically measuring the ammonia produced following exhaustive hydrolysis by urease and subtracting the amount of ammonia present before enzymatic hydrolyse.Abstract:
This report describes a method for the determination of ammonia and urea in raw sewage samples using an Orion Ammonia Gas-Sensing Electrode. Urea is determined by potentiometrically measuring the ammonia produced following exhaustive hydrolysis by urease and subtracting the amount of ammonia present before enzymatic hydrolysis. The recovery of urea from raw sewage samples using the procedure herein described is shown to be nearly Quantitative.read more
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Book ChapterDOI
Applications of Ion-Selective Electrodes
G. J. Moody,J. D. R. Thomas +1 more
TL;DR: Ion-selective electrodes are commercially available for about 20 common anions and cations and have found applications in many branches of science and have been used in many applications.
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Microdetermination of ammonia using an ammonia gas-sensing electrode and a minicomputer
TL;DR: In this paper, the multiple addition method has been used in combination with Gran plots for the determination of 2×10−4M to 1 × 10−6M (28 ppm to 14 ppb) of ammonia nitrogen.
Journal ArticleDOI
[A NH(+4)-selective-enzymatic flow-through system. A method for the continuous enzymatic, electrochemical determination of urea, II (author's transl)].
TL;DR: In this article, a flow-through system for the measurement of urea concentrations is described, using soluble urease and consecutive determination of liberated ammonium ions by a selective disc-electrode.
Book ChapterDOI
CHAPTER 12 – Diuretic Drugs
TL;DR: This chapter discusses the chemical formula, chemical name, and electrodes sensitive to various diuretic drugs, such as mercury compounds, sulphonamides, and urea, which has been used intravenously in the treatment of acute increase in intracranial pressure because of cerebral oedema.
References
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Enzyme electrode for the substrate urea
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Urease catalysis. ii. inhibition of the enzyme by hydroxyurea, hydroxylamine, and acetohydroxamic acid.
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Use of ion selective electrodes in enzymic analysis. Cation electrodes for deaminase enzyme systems
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