An experimental approach to the photolysis of pesticides adsorbed on soil: Thidiazuron |
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Authors: | Meinolf Klehr Jrg Iwan Jürgen Riemann |
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Institution: | Meinolf Klehr,Jörg Iwan,Jürgen Riemann |
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Abstract: | An experimental procedure has been developed for conducting photolysis studies with pesticides adsorbed by soil surfaces. In these experiments, solutions of thidiazuron were sprayed on segments of a 0.5-mm layer of soil covering a glass plate. The soil surface was irradiated using simulated sunlight. The light source was a xenon arc in combination with glass filters that absorbed light of wavelength <290 nm. During irradiation, one half of the sprayed areas was covered to obtain nonirradiated samples. After various time intervals, groups of three irradiated and three non-irradiated segments of the soil were scraped off and extracted; the extracts were analysed. Information was obtained on the photoproducts formed and on the kinetics of photodegradation of thidiazuron. |
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