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Internal Standard-Amplitude Modulated Multiplexed Flow Analysis.

Takuya Sumitomo1, Mari Osaki1, Takeshi Ogusu2

  • 1Faculty of Pharmaceutical Sciences, Tokushima University.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|December 12, 2017
PubMed
Summary
This summary is machine-generated.

A novel flow analysis method uses internal standard-amplitude modulation for precise ferrous ion determination. This technique significantly enhances analytical performance and accuracy in real-world water samples.

Keywords:
1,10-phenanthrolineAmplitude modulated multiplexed flow analysisFe(II) ionFourier transformamplitude modulationinternal standard method

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Area of Science:

  • Analytical Chemistry
  • Spectrophotometry
  • Flow Analysis

Background:

  • Traditional flow analysis methods can suffer from precision and accuracy limitations.
  • Internal standardization is a common technique to improve analytical measurements.
  • Multiplexed flow analysis allows for simultaneous determination of multiple analytes.

Purpose of the Study:

  • To introduce and validate a new flow analysis concept: internal standard-amplitude modulated multiplexed flow analysis (IS-AM-MFA).
  • To apply IS-AM-MFA for the spectrophotometric determination of ferrous ion (Fe2+).
  • To evaluate the method's performance regarding precision, linearity, detection limits, and robustness.

Main Methods:

  • Sinusoidally varying flow rates of sample solutions containing Methylene Blue (MB) as an internal standard.
  • Merging sample streams with a color reagent (1,10-phenanthroline) while maintaining a constant total flow rate.
  • Monitoring analytical signals at specific wavelengths (510 nm for Fe2+-o-Phen, 644 nm for MB) and analyzing them using fast Fourier transform (FFT).

Main Results:

  • Simultaneous determination of analytes from the amplitudes of corresponding wave components obtained via FFT.
  • Significant improvements in precision, calibration curve linearity, and limit of detection compared to conventional methods.
  • Enhanced robustness against flow rate fluctuations.
  • Accurate Fe2+ quantification with recoveries around 100% in spiked real water samples.

Conclusions:

  • Internal standard-amplitude modulated multiplexed flow analysis is a viable and effective technique for sensitive and precise chemical analysis.
  • The method offers superior analytical performance and robustness, making it suitable for complex sample matrices.
  • This approach represents a significant advancement in flow analysis instrumentation and methodology.