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Langenbach, T.* ; Schroll, R. ; Paim, S.*

Fate and distribution of 14C-atrazine in a tropical oxisol.

Chemosphere 40, 449-455 (2000)

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Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.

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The herbicide atrazine is the most commonly detected pesticide in groundwater world-wide. A new microcosm test-system was used to determine the fate of ¹⁴C-atrazine in a Brazilian oxisol. ¹⁴C Ring-labelled atrazine was applied in a mixture with the commercial product Gesaprim 500 (Novartis) at a rate of 3 kg ha⁻¹. During two months, about 1% of the initially applied amount was lost by volatilization. The mineralization of the pesticide, measured directly using ¹⁴CO₂ evolved from the applied pesticide, was between 0.09% and 0.16%, whereas less than 0.2% was leached. The distribution of radioactivity in the soil profile showed that most of the radioactivity remained in the top soil down to a 3 cm depth. The radioactivity in the upper 3 cm of the column was adsorbed perferably in fulvic acid (FA) and humin fractions.

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