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

• Main Authors: Chen, Guan-Yu, Lin, Yueh-Hsin, Fu, Cheng-Hsin, Lin, Cheng-Huang, Muthiah, Balaganesh, Espulgar, Wilfred V., Santos, Gil Nonato C., Yu, Derrick Ethelbhert C., Kasai, Toshio
• Format: text
• Published: Animo Repository 2024
• Subjects: Peracetic acid; Acetic acid; Solvation; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/13219
• Institution: De La Salle University

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, infuenced by its presence in a complex quaternary equilibrium mixture with hydrogen peroxide (H2O2), acetic acid, and water, lacks discernible peaks. This inher- ent complexity challenges conventional analytical techniques like Beer's law, which rely on absorption intensity as a foun- dation. 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 signifcantly enhances the precision of calibration curves for both diluted PAA and H2O2, unveiling an exponential correlation between wavelength and the logarithm of concentra- tion for both components. Signifcantly, 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), signifcantly reduces the errors in both methods, a fnding 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 feld of chemical analysis and spectroscopy. Keywords Peracetic acid (PAA) · UV/Vis spectrum · Wavelength shift analysis for PAA+ H2O2 mixture · New analytical methodology of UV/Vis absorption · Wavelength at fxed absorbance value · Solvatochromism efect · Hypsochromic efect · Blue shift by solvation