Micro coulometric titration in a liquid drop

Kanyanee, Tinakorn; Fuekhad, Pongwasin; Grudpan, Kate

doi:10.1016/j.talanta.2013.04.039

Cited by 11 publications

(10 citation statements)

References 30 publications

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“…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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Section: Introductionmentioning

confidence: 99%

Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell

et al. 2019

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“…However, the throughput rate remained limited due to the manual addition of titrant and samples. By using several flow-based approaches for several analytes [3,[6][7][8][9][10][11][12][13][14][15], the development of automatic and miniaturized systems for carrying out titrations solved these problems, especially for determination of acidity in edible oils [2,16,17].…”

Section: Introductionmentioning

confidence: 99%

Digital movie-based on automatic titrations

Lima

Almeida

Lyra

et al. 2016

Talanta

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“…An inclined platform on which a drop falls and moves is particularly conducive to this; Liu and Dasgupta [32] introduced transient electrokinetic injection in CE based on this principle. Recently, we have refined the ability to control drop movement by using a hydrophobic inclined path for drop movement and a suspended probe with a hydrophilic exterior in the transit path to stop the drop by adhesion, and then allow it to move down again by allowing additional drop(s) to merge whence the gravitational force overcomes adhesion forces [33]. The use of this system was then demonstrated for microcoulometric titrations of analytes in the drop.…”

Section: Introductionmentioning

confidence: 99%