• OZONE RESIDUAL DETERMINATION OR TOTAL OXIDANT DETERMINATION BY IODOMETRIC TITRATION-ASSISTED SPECTROPHOTOMETRY

    Author(s):
    Lawrence K Wang (see profile) , Mu-Hao Sung Wang
    Editor(s):
    Yuriy I. Pankivskyi
    Date:
    2022
    Group(s):
    Science, Technology, Engineering and Mathematics
    Subject(s):
    Ozone, Spectrophotometry, Analytical chemistry, Environmental chemistry
    Item Type:
    Book chapter
    Tag(s):
    ozone analysis, titration, colorimetry, total oxidant, standard methods
    Permanent URL:
    https://doi.org/10.17613/z0sy-ys27
    Abstract:
    Wang, LK and Wang, MHS (2022). Ozone residual determination or total oxidant determination by iodometric titration-assisted spectrophotometry. In: "Environmental Science, Technology, Engineering, and Mathematics (STEM)", Wang, LK, Wang, MHS, and Pankivskyi, YI (editors). Volume 2022, Number 9, September 2022; pp.56. Lenox Institute Press, MA, USA............... ABSTRACT: This publication introduces: (a) ozone residual determination by iodometric titration-assisted spectrophotometry; (b) total oxidant determination by iodometric titration-assisted spectrophotometry; (c) traditional ozone residual determination by iodometric titration method; (d) ozone residual determination by iodometric titration-assisted indigo colorimetric method. The new methods use identical chemical reagents required for ozone residue analysis by a historical standard iodometric titration method, but need no titration step once a set of ozone calibration curves is established for subsequent spectrophotometric analysis. The basic principle involves the liberation of iodine from a potassium iodide solution in the presence of ozone residue (and other oxidants if the interferences are purposely not eliminated ). After an acidification step for fixation of the ozone content (or total oxidant content, if intended for total oxidant analysis) in solution the liberated iodine by ozone (and other oxidant, if included) produces a yellow color. The degree of color intensity is proportional to the original ozone concentration in water, and can be measured spectrophotometrically or colorimetrically. The range of ozone concentration measurable is from 0.03 to 6.0 mg/L. The new method has a precision of ± 1% for ozone concentrations of 3 mg/L or greater. For total oxidant determination, the oxidant interferences are not eliminated. The authors recommend that the traditional iodometric titration method be restored to be one of the Standard Methods for ozone residual analysis.
    Notes:
    Ozone Residual, Total Oxidant Concentration, Iodometric Titration Method , Spectrophotometry, Colorimetry, Mobile Laboratory, Standard Methods, Iodometric Titration-Assisted Spectrophotometry, Iodometric Titration-Assisted Indigo Colorimetric Method, Dedication, Aimee E. Thayer, Lenox Institute of Water Technology
    Metadata:
    Published as:
    Book chapter    
    Status:
    Published
    Last Updated:
    3 months ago
    License:
    All Rights Reserved
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