Biodegradation of Herbicide Propanil and Its Subproduct 3,4‐Dichloroaniline in Water |
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| Authors: | Rafael Roehrs Miguel Roehrs Sérgio L de O Machado Renato Zanella |
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| Institution: | 1. Laboratory of Pesticide Residues Analysis, Chemistry Department, Federal University of Santa Maria ‐ UFSM, Santa Maria ‐ RS, Brazil;2. Present address: Laboratory of Physicochemical and Natural Products Studies, Federal University of Pampa ‐ UNIPAMPA, Urugauaiana ‐ RS, Brazil;3. Weed Science Department, Federal University of Santa Maria ‐ UFSM, 97105‐900 Santa Maria ‐ RS, Brazil |
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| Abstract: | The rational use of pesticides generates an impact which is normally reversed and eliminated by the environment itself. However, the indiscriminate use of pesticides makes its natural degradation rhythm difficult, prolonging their presence in the soil for a great deal of time. Aiming towards a decrease in the environmental impact of pesticides, soil microorganisms capable of degrading pesticides, such as propanil, were investigated. An Enterobacter cloacae strain, isolated from rice field soil, was exposed to the herbicide propanil alone and in a mixture containing also bentazone, clomazone, quinclorac, and 2,4‐D. This bacterium was able to eliminate 100% of the applied propanil in 28 days. Propanil degradation in the 5‐herbicide mixture was much lower than that of individual pesticide degradation. The aeration of the system helped to degrade propanil and its subproduct 3,4‐dichloroaniline much faster. LC with UV detection was used to determine the remaining concentrations of the herbicides and their subproducts. |
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| Keywords: | Bioremediation Environmental pollution Enzyme activity Microorganism Pesticide |
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