A Unified Ion Chromatographic System for the Determination of Acidity and Alkalinity

Hu, Wenzhi; Hasebe, Kiyoshi; Iles, Alexander; Tanaka, Kazuhiko

doi:10.2116/analsci.17.1401

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…It is noteworthy that such a kind of proton transportation caused by the formation of R-COOH (weakly acid) was not observed when the sulfonated type of column was used as the separation column for the determination of the acidity of oxalic acid and tartaric acid samples. 4 H + ions that bound to the stationary phase in the manner of cation-exchange, namely, in the RCOO --H + (s) form, were replaced by K + ions based on cation-exchange (Eq. (3)).…”

Section: The Principlesmentioning

confidence: 99%

“…The ion chromatographic (IC) approach, i.e., to initially separate free H + ions from other ions based on cation-exchange and then to detect the isolated H + ions using conductivity [2][3][4] has been a possible solution to the low-accuracy difficulty of the traditional methods. In the IC systems developed in previous studies, 2-4 sulfonated cation-exchangers have been the entire IC stationary phase.…”

Section: Introductionmentioning

confidence: 99%

“…Weakly acidic functional groups can be blocked from the separation procedure by always maintaining a sufficiently large amount of H + ions in the eluent. 2,4 However, this has limited the meaningful IC data to only strongly acidic samples.…”

Section: Introductionmentioning

confidence: 99%

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Ion Chromatographic Determination of Total Acidity in Aqueous Solutions

Hasebe

Tanaka

2002

ANAL. SCI.

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Section: The Principlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ion Chromatographic Determination of Total Acidity in Aqueous Solutions

Hasebe

Tanaka

2002

ANAL. SCI.

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“…As such, the method is generally time consuming; the method also suffers from precise color change individuation in strongly colored vinegars. Instrumental analytical techniques, such as gas chromatography, 3 high-performance liquid chromatography, 4,5 ion chromatography, 6 capillary electrophoresis, 7 polarography, 8 electrochemical modification, 9,10 nuclear magnetic resonance, 11 have been proposed for the total acidity assay of weak acids in food samples.…”

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confidence: 99%

A Method for the Determination of Weak Acid Concentration Based on Electrochemical Reduction of Benzoquinone

Liu

Wang

et al. 2016

J. Electrochem. Soc.

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With the addition of a weak acid, a new prepeak occurs at a positive potential when quinone is reduced in an unbuffered solution. This prepeak was initially attributed to the protonation of a quinone anion radical. However, two prepeaks of the reduced quinone are detected in a solution containing dilute acetic acid and sodium dihydrogen phosphate. Evidently, the two prepeaks could not be assigned to the protonation of the quinone anion radical. In the unbuffered solution, the pH near the electrode surface increases drastically during the electrochemical reduction of p-benzoquinone (BQ). Our previous work revealed that a steep change in pH near the electrode surface produces a new voltammetric wave in a dilute buffer solution. We suggest that the new prepeaks are generated by a drastic change in pH near the electrode surface. Weak acids can release protons and suppress the increase in pH on the electrode surface. Therefore, the height of the prepeak is proportional to the concentration of the weak acid but is independent of BQ. We then establish a differential pulse voltammetric method to measure the weak acid and acetic acid contents of two kinds of vinegars. Our results agree well with those measured through potentiometric titration.

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Comprehensive two‐dimensional separation system by coupling capillary reverse‐phase liquid chromatography to capillary isoelectric focusing for peptide and protein mapping with laser‐induced fluorescence detection

Mao

Zhang

2003

Electrophoresis

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A comprehensive two-dimensional (2-D) separation system, coupling capillary reverse-phase liquid chromatography (cRPLC) to capillary isoelectric focusing (CIEF), is described for protein and peptide mapping. cRPLC, the first dimension, provided high-resolution separations for salt-free proteins. CIEF, the second dimension with an orthogonal mechanism to cRPLC afforded excellent resolution capability for proteins with efficient protein enrichment. Since all sample fractions in cRPLC effluents could be transferred to the CIEF dimensions, the combination of the two high-efficiency separations resulted in maximal separation capabilities of each dimension. Separation effectiveness of this approach was demonstrated using complex protein/peptide samples, such as yeast cytosol and a BSA tryptic digest. A peak capacity of more than 10 000 had been achieved. A laser-induced fluorescence (LIF) detector, developed for this system, allowed for high-sensitive detection, with a fmol level of peptide detection for the BSA digest. FITC and BODIPY maleimide were used to tag the proteins, and the latter was found better both for separation and detection in our 2-D system.

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A Unified Ion Chromatographic System for the Determination of Acidity and Alkalinity

Cited by 13 publications

References 10 publications

Ion Chromatographic Determination of Total Acidity in Aqueous Solutions

Ion Chromatographic Determination of Total Acidity in Aqueous Solutions

A Method for the Determination of Weak Acid Concentration Based on Electrochemical Reduction of Benzoquinone

Comprehensive two‐dimensional separation system by coupling capillary reverse‐phase liquid chromatography to capillary isoelectric focusing for peptide and protein mapping with laser‐induced fluorescence detection

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