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Photodecomposition of DDA

G W Ware, D G Crosby, J W Giles

    Archives of Environmental Contamination and Toxicology
    |January 1, 1980
    PubMed
    Summary

    Photodecomposition of 2,2-bis (p-chlorophenyl) acetic acid (DDA) in water yields various products, including p,p'-dichlorobenzophenone (DCB). High-pressure liquid chromatography (HPLC) effectively analyzes these DDT-related compounds and their environmental degradation pathways.

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    Area of Science:

    • Environmental Chemistry
    • Photochemistry
    • Analytical Chemistry

    Background:

    • DDT and its derivatives are persistent organic pollutants.
    • Understanding the environmental fate of these compounds is crucial for risk assessment.
    • Photodegradation is a significant environmental transformation process.

    Purpose of the Study:

    • To investigate the photodecomposition pathways of 2,2-bis (p-chlorophenyl) acetic acid (DDA) in aqueous solutions.
    • To identify the photoproducts formed during DDA degradation.
    • To evaluate the suitability of HPLC for analyzing these compounds.

    Main Methods:

    • Photolysis of aqueous DDA solutions under laboratory and sunlight conditions.
    • Identification and quantification of parent compounds and photoproducts using High-Pressure Liquid Chromatography (HPLC).
    • Analysis of related compounds like p,p'-Dichlorobenzilic acid, p,p'-dichlorobenzhydrol, bis-(p-chlorophenyl) methane (DDM), and chlorogenzilate.

    Main Results:

    • DDA photodecomposition produced p,p'-dichlorobenzophenone (DCB), p-chlorobenzaldehyde, p-chlorophenol, and other polar products.
    • DCB and p-chlorobenzaldehyde were resistant to photodegradation but slowly formed p-chlorobenzoic acid.
    • HPLC proved effective for separating and quantifying DDA and its photoproducts in aqueous samples.

    Conclusions:

    • DDA undergoes photodecomposition in water, yielding various transformation products.
    • The study elucidates a potential environmental degradation pathway for DDT-related compounds.
    • HPLC is a valuable analytical tool for monitoring these pollutants and their degradation.

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