Author(s): Langenbach T, Correia FV, Macrae A, Vargas EA Jr, Campos TM
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Abstract The fate of (14)C atrazine was investigated using microcosms and an undisturbed Red-Yellow Latossol (Oxisol) under simulated rainfall conditions of 200 mm water month(-1). Experiments were carried out using microcosm cores, the first with an uncovered surface soil; the second set with uncovered subsurface soil; the third with subsurface soil covered with 3 cm of cow manure and the last with subsurface soil covered with 5 cm of grass straw. Average values for the amount of atrazine leached after 60 days were as follows: surface soil 1.6\%; subsurface 47.3\%; subsurface plus manure 17.3\% and subsurface plus straw 24.8\%. In the surface soil, 53\% of the (14)C atrazine remained within the upper 1 cm, while in the subsurface microcosms the atrazine was more evenly distributed. The authors report that surface soil was retained atrazine and its metabolites for 60 days. The addition of a straw or manure covering to exposed subsoil helped to retard atrazine leaching.
This article was published in J Environ Sci Health B
and referenced in Journal of Bioremediation & Biodegradation