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

Hideji Tanaka1,2, Riona Wada3, Masatoshi Yanase3

  • 1Institute of Biomedical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, 770-8505, Japan. h.tanaka@tokushima-u.ac.jp.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
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PubMed
Summary

This study introduces amplitude-modulated flow analysis to expand dynamic range for saturated analytical signals. A novel method achieves linear calibration for high concentrations by plotting the product of concentration and signal amplitude against concentration.

Keywords:
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Area of Science:

  • Analytical Chemistry
  • Spectrophotometry

Background:

  • Analytical methods often face limitations in dynamic range, especially with saturated signals.
  • Extending the measurable concentration range is crucial for comprehensive sample analysis.

Purpose of the Study:

  • To develop and validate a novel amplitude-modulated flow analysis technique.
  • To extend the dynamic range of analytical measurements to accommodate saturated signals.
  • To enable linear calibration for samples with high analyte concentrations.

Main Methods:

  • Utilized amplitude-modulated flow analysis with a periodically varied sample flow rate (FS) and constant reagent flow rate (FR).
  • Employed a diluent to maintain a constant total flow rate (FT).
  • Processed the downstream analytical signal (Vd) using fast Fourier transform (FFT) to analyze wave components.
  • Developed a calibration strategy by plotting CSΣA versus CS for saturated signals.

Main Results:

  • Demonstrated that the sum of amplitudes (ΣA) is proportional to sample concentration (CS) at low concentrations.
  • Showed that at high concentrations, Vd saturates, resulting in a trapezoidal profile.
  • Achieved linear calibration for saturated signals by plotting CSΣA against CS.
  • Validated the concept using spectrophotometric determination of Methylene Blue and iron complexes.

Conclusions:

  • Amplitude-modulated flow analysis effectively extends the dynamic range of analytical measurements.
  • The proposed method provides a linear calibration for both low and high analyte concentrations, including saturated signals.
  • This technique offers a versatile approach for spectrophotometric analysis of various analytes.