Triangular-wave controlled amplitude-modulated flow analysis for extending dynamic range to saturated signals

Triangular-wave controlled amplitude-modulated flow analysis for extending dynamic range to saturated signals

We have applied our amplitude-modulated flow analysis concept to extend the dynamic range to saturated analytical signals. Sample solution, the flow rate F S of which is periodically varied with a triangular control signal V c , is merged with a reagent solution delivered at a constant flow rate F R...

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Bibliographic Details
Published in:Analytical sciences Vol. 38; no. 5; pp. 795 - 802
Main Authors: Tanaka, Hideji, Wada, Riona, Yanase, Masatoshi, Tomiyama, Erina, Ohbuchi, Akira, Higuchi, Keiro, Takeuchi, Masaki
Format: Journal Article
Language:English
Published: Singapore Springer Nature Singapore 01-05-2022
Subjects:
Analytical Chemistry
Calibration
Chemistry
Chemistry and Materials Science
Fourier Analysis
Indicators and Reagents
Original Paper
Spectrophotometry
Amplitude modulated flow analysis
Triangular-wave control
Flow rate modulation
Fast Fourier transform
Saturated signal
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Summary:We have applied our amplitude-modulated flow analysis concept to extend the dynamic range to saturated analytical signals. Sample solution, the flow rate F S of which is periodically varied with a triangular control signal V c , is merged with a reagent solution delivered at a constant flow rate F R . While the total flow rate F T is kept constant, a diluent with F T –( F S  +  F R ) flow rate is aspirated from the third channel. The analytical signal V d obtained downstream is processed by fast Fourier transform to obtain the amplitudes of the wave components in V d . When the sample concentration C S is low, V d shows a triangular profile like V c ; the sum of the amplitudes Σ A is proportional to C S . When C S is high, V d shows a trapezoidal profile because of the V d saturation. A linear calibration curve can also be obtained for such saturated signals by plotting C S Σ A against C S . The proof of the concept is validated by applying it to spectrophotometric determinations of a dye (Methylene Blue) and colored complexes of Fe 2+  − phenanthroline and Fe 3+  − Tiron. Graphical abstract
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ISSN:0910-6340
1348-2246
DOI:10.1007/s44211-022-00097-4