Air-Segmented Amplitude-Modulated Multiplexed Flow Analysis

Inui, Koji; Uemura, Takeshi; Ogusu, Takeshi; Takeuchi, Masaki; Tanaka, Hideji

doi:10.2116/analsci.27.305

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…An in-house program written in Excel VBA was used for the acquisition, analysis and graphical display of the data. The previous program 3 was improved so that it could remove noise from air bubbles that were accidentally introduced to the flow cell.…”

Section: Notesmentioning

confidence: 99%

“…That is, the effect of air-segmentation is more pronounced when the control period becomes shorter. 3 The difference in the slopes for the total and nitrite concentration can also be attributed to that in the control period; amplitude damping is more significant when the control period becomes shorter.…”

Section: Analytical Performancementioning

confidence: 99%

“…We have applied AMMFA to the determinations of food dyes, 1 ferrous ion, 1 chloride ion 2 and nitrite ion. 3 The segmentation of a liquid stream with air bubbles is effective to increase the sensitivity, because the bubbles act as barriers against the axial dispersion of analytes. 3 The applications of AMMFA remained, however, a single analyte per sample.…”

Section: Introductionmentioning

confidence: 99%

“…3 The segmentation of a liquid stream with air bubbles is effective to increase the sensitivity, because the bubbles act as barriers against the axial dispersion of analytes. 3 The applications of AMMFA remained, however, a single analyte per sample. The purpose of the present study is, therefore, to extend the concept of AMMFA to the simultaneous determination of multiple analytes in a sample.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simultaneous Determination of Nitrite and Nitrate Ions by Air-Segmented Amplitude-Modulated Multiplexed Flow Analysis

et al. 2012

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Section: Notesmentioning

confidence: 99%

Section: Analytical Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous Determination of Nitrite and Nitrate Ions by Air-Segmented Amplitude-Modulated Multiplexed Flow Analysis

et al. 2012

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“…The concentrations of analytes in the samples are simultaneously determined from the amplitudes of corresponding wave components. We have applied the concept to the determinations of food dyes, 1 ferrous ion, 1 chloride ion, 2 nitrite ion, 3 phosphate ion 3,4 and ammonium ion 5 in multiple samples, and to the simultaneous determinations of nitrite and nitrate ions 6 in a sample. AMMFA is less susceptible to baseline drift because the quantification is not based on the values of analytical signals, but on the amplitudes of analytical signals.…”

Section: Introductionmentioning

confidence: 99%

Internal Standard-Amplitude Modulated Multiplexed Flow Analysis

et al. 2017

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A new concept of flow analysis, internal standard-amplitude modulated multiplexed flow analysis, is proposed. A proof of concept was verified by applying it to the determination of ferrous ion (Fe 2+ ) by 1,10-phenanthroline (o-Phen) spectrophotometry. The flow rates of sample solutions containing Methylene Blue (MB) as an internal standard substance were sinusoidally varied at different frequencies. The solutions were merged with a color reagent (o-Phen) solution, while the total flow rate was held constant. Downstream, analytical signals were monitored at the maximum absorption wavelengths of Fe 2+ -o-Phen complex and of MB (510 and 644 nm, respectively). The signals were respectively analyzed by fast Fourier transform. The concentrations of the analytes in respective samples were simultaneously determined from the amplitudes of the corresponding wave components. The precision, linearity of the calibration curve, limit of detection and robustness against deliberate fluctuation in flow rate were greatly improved by introducing the internal standard method. Good recoveries of around 100% were obtained for Fe 2+ spiked into real water samples.

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