Quantification of peracetic acid (PAA) in the H2O2 + acetic acid reaction by the wavelength shift analysis in near-UV/visible absorption region

Guan Yu Chen, Yueh Hsin Lin, Cheng Hsin Fu, Cheng Huang Lin*, Balaganesh Muthiah, Wilfred V. Espulgar*, Gil Nonato Santos, Derrick Ethelbhert Yu, Toshio Kasai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In our study, we present an innovative method for the analysis and real-time monitoring of peracetic acid (PAA) formation within the near-UV/Vis (visible) wavelength region. PAA's absorption spectrum, influenced by its presence in a complex quaternary equilibrium mixture with hydrogen peroxide (H2O2), acetic acid, and water, lacks discernible peaks. This inherent complexity challenges conventional analytical techniques like Beer's law, which rely on absorption intensity as a foundation. To address this challenge, we introduce a novel approach that centers on the analysis of blue shifts in absorption wavelengths, particularly at an absorbance of 0.8 a.u. This method significantly enhances the precision of calibration curves for both diluted PAA and H2O2, unveiling an exponential correlation between wavelength and the logarithm of concentration for both components. Significantly, our approach allows for real-time and accurate measurements, especially during the dynamic PAA formation reaction. Our results exhibit excellent agreement with data obtained from Fourier-transform infrared (FT-IR) spectroscopy, validating the reliability of our method. It's noteworthy that under stable PAA concentration conditions (after 12 h of solution interaction), both traditional absorption method and our approach closely align with the FT-IR method. However, in dynamic scenarios (0−12 h), the absorption method exhibits higher error rates compared to our approach. Additionally, the increased concentration of a catalyst, sulfuric acid (H2SO4), significantly reduces the errors in both methods, a finding that warrants further exploration. In summary, our study not only advances our understanding of PAA and its spectral behavior but also introduces innovative and precise methods for determining PAA concentration in complex solutions. These advancements hold the potential to revolutionize the field of chemical analysis and spectroscopy. Graphical abstract: (Figure presented.)

Original languageEnglish
Pages (from-to)489-499
Number of pages11
JournalAnalytical Sciences
Issue number3
Publication statusPublished - 2024 Mar


  • Blue shift by solvation
  • Hypsochromic effect
  • New analytical methodology of UV/Vis absorption
  • Peracetic acid (PAA)
  • Solvatochromism effect
  • UV/Vis spectrum
  • Wavelength at fixed absorbance value
  • Wavelength shift analysis for PAA + HO mixture

ASJC Scopus subject areas

  • Analytical Chemistry


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