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Atrazine Degradation, Sorption, and Bioconcentration in Water Systems

机译：水系统中阿特拉津的降解，吸附和生物富集

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The herbicide atrazine is used extensively to control broadleaf and grass weeds in such crops as sorghum and corn. A small portion of the atrazine may be lost from the area of application by surface runoff and could enter a stream or lake. Once the atrazine enters a water system, the partitioning of atrazine between the aqueous and solid phases of the water-sediment system largely determines the impact of the herbicide on water quality and aquatic ecosystems. The results of studies on water-sediment systems indicated that sediments with lower pH values and higher organic matter levels adsorbed higher levels of atrazine than sediments with neutral pH values and lower organic matter levels. Microbial decomposition of the herbicide was slow. Addition of supplemental carbon sources in the form of glucose or peptone did not appear to influence the rate of atrazine degradation. Bioconcentration of atrazine by fungi and bacteria was demonstrated. The organic component of the suspended particulate matter in a water system may be an active adsorption site.

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