Quantification of peracetic acid (PAA) in the H < sub > 2 < /sub > O < sub > 2 < /sub >  + acetic acid reaction by the wavelength shift analysis in near-UV/visible absorption region

Anal Sci. 2024 Jan 2. doi: 10.1007/s44211-023-00481-8. Online ahead of print.ABSTRACTIn 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 ex...

Source: Anal Sci - January 2, 2024 Category: Chemistry Authors: 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 Source Type: research