Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry

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Abstract

Disposal of pesticides into the environment by photo degradation: Case of Atrazine

Author(s): Elhabib ELazzouzi, Hind ElBouzaidi Oussama Benabbi, Abdellah Benzaoauak and Mohammed Fekhaoui

Atrazine is an active substance which belongs to the chemical family of triazine representing an effects of an herbicide, Atrazine is one of the herbicides used in the world according to the United States environmental protection agency(EPA), while it was banned in the European Union, Atrazine is used in a large number of countries including Morocco, it uses for the elimination of undesirable in many cultures annual or perennial plants. Its physicochemical characteristics influence the risk of transfer of this active substance into the water as a water pollutant, this research has enabled us to record different channels of elimination of Atrazine by photochemical degradation of Atrazine in absence and in the presence of Humic acids in the soil. This study synthesizes some of the work that we have carried out on the behavior of herbicide Atrazine and, with the aim of understanding and predicting the fate of the plant protection product. For the photodegradation of Atrazine in the absence of Humic acids at different pH values, wavelengths and oxygen concentrations, results showed that: - The pH affects the photochemical behavior of Atrazine in solution. - The ionic form of the carboxylic acid function photo degradation faster than the molecular form and in the absence of oxygen. - The Concentration of Atrazine has an effect on the kinetics of photochemical degradation, which is explained by a bimolecular process with formation of photoproducts. - A Keto-enol equilibrium was noticed after the calculation of the quantum yields at different wavelengths of radiation. So that in the presence of the Humic acids, It is clear from these results that these Humic acids that were tested have played a dual role: inhibitory and generator of active species. To below 340 nm wavelengths, it certifies a competitive absorption of light radiation between Atrazine and Humic acids which play a role of screen


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