Accuracy in the precise coulometric titration of ammonia and ammonium ion with electrogenerated hypobromite

Hioki, Akiharu

doi:10.1016/0039-9140(91)80077-d

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…Hypobromite 12-15 and hydroxide ions 14 have been used as a titrant for the coulometric titration of ammonia or ammonium ion. In this work, hypobromite ion was adopted as the coulometric titrant because it is generated electrolytically with 100% current efficiency in a weakly basic solution.…”

Section: Coulometric Titration Of Ammonium Ionmentioning

confidence: 99%

Coulometric Titration of Urea with Electrogenerated Hypobromite

et al. 2013

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Section: Coulometric Titration Of Ammonium Ionmentioning

confidence: 99%

Coulometric Titration of Urea with Electrogenerated Hypobromite

et al. 2013

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“…In other cases, coulometric titration and/or gravimetry were utilized to determine the main constituent. Hypobromite was electrically generated to determine ammonium ions in ammonium chloride [10] used as the raw material for an ammonium ion standard solution. Coulometric titration with electrogenerated iodine was applied to antimony(III) and arsenic(III) in the raw materials for antimony and arsenic standard solutions, respectively [11].…”

Section: Standard Solulionsmentioning

confidence: 99%

Development and supply system of reference materials based on the Measurement Law in Japan

Kubota

Kato

Hioki

et al. 1997

Accreditation and Quality Assurance

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Analytical instruments used for measurements of air and water pollution are calibrated by using reference materials such as standard gases and standard solutions. In Japan, since the middle of the 1970s, those reference materials which are traceable to the national standards maintained at national research institutes have been supplied to users by reference material producers. In order to establish the primary standards and to secure the traceability from the working standards to the national ones, various analytical methods such as coulometric, titrimetric and gravimetric analyses for purity determination and highly sensitive atomic spectrometry for trace analysis have been developed as the primary methods and reference methods. The Japanese Measurement Law, revised in 1992, has introduced a new traceability system in which a public organization, a "designated calibration body", can also prepare and maintain the national standards under the advice and instruction of national research institutes. The designated calibration body can provide calibration services to reference material producers (accredited calibration bodies) by using the national standards. The reference materials supplied in conformity with the traceability system include standard gases, pH standard solutions, metal standard solutions and non-metal ion standard solutions.

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“…1−30 Reviews of coulometric titrations illustrate a broad scope of its analytical applications. 7,13,18 A variety of substances have been analyzed by coulometric titrations, including porphyrins, 24 mercury complexes, 25 thiols, 26 cations and anions, 2,27,29 complexes of nickel, 21 biodiesels, 12 and reference standards. 5,6 Coulometric Karl–Fischer analysis was applied to characterize microemulsions 19 and porphyrin assemblies.…”

Section: Introductionmentioning

confidence: 99%

“…Reagents that are unstable to use because of volatility or reactivity can be employed as coulometric titrants and dilution effects do not occur during the titration. Over several decades, numerous reports presented coulometric titrations applied to a wide field of applications. − Reviews of coulometric titrations illustrate a broad scope of its analytical applications. ,, A variety of substances have been analyzed by coulometric titrations, including porphyrins, mercury complexes, thiols, cations and anions, ,, complexes of nickel, biodiesels, and reference standards. , Coulometric Karl–Fischer analysis was applied to characterize microemulsions and porphyrin assemblies . Laboratory experiments of an academic interest present coulometric analysis of common household products. , Several innovative methods demonstrate coulometric devices for inexpensive, rapid, and sensitive analysis.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell

et al. 2019

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Feasibility of performing multiple coulometric titrations in a single course of electrolysis is presented. In these titrations, three pairs of cathode and anode compartments were connected with a network of electrodes and salt bridges. Passage of current through the cell caused concurrent electrolysis in cathode and anode compartments. Electrogenerated reagents produced in these compartments were used as titrants for quantifying the analyte samples. Endpoints of the titrations were determined from the visual color change of an indicator. The charge passing through the cell was monitored and Faraday’s laws of electrolysis were applied to assess the quantitative relation between the charge and analyte concentration. Experimentally determined coulombs required to titrate aqueous potassium hydrogen phthalate, MnO 4 – , OH – , and S 2 O 3 2– were 0.100, 0.466, 0.103, and 0.0934 C, respectively. These results matched with estimated values of 0.0965, 0.482, 0.0965, and 0.0965 C, respectively. Agreement between the coulombs determined from experimental results and reaction stoichiometry suggests a feasible application of concurrent coulometric titrations. Efficacy of the method was tested for determining the active ingredients in household vinegar and vitamin C dietary supplement tablets. Quantities of acetic acid and ascorbic acid in these products were 5.1% and 980 mg, respectively, agreeing with the quantities determined from volumetric titrations (5.1% and 990 mg) and manufacturer’s label (5.0% and 1000 mg).

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Accuracy in the precise coulometric titration of ammonia and ammonium ion with electrogenerated hypobromite

Cited by 12 publications

References 20 publications

Coulometric Titration of Urea with Electrogenerated Hypobromite

Coulometric Titration of Urea with Electrogenerated Hypobromite

Development and supply system of reference materials based on the Measurement Law in Japan

Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell

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