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Extractable atrazine and its metabolites in agricultural soils from the temperate humid zone.
|Authors:||Mahía, J.; Martín, A.; Díaz-Raviña, M.|
|Keywords:||Atrazine • Agricultural soils • Degradation producís • Extraclable residues|
|Citation:||Environmental Geochemistry and Health|
|Abstract:||Extractable atrazine and its metabolites (hydroxyatrazine, deethylatrazine and deisopropylatrazine) were evaluated in agricultural soils from the températe humid zone (Galicia, NW Spain) under laboratory conditions. The experiment was performcd with five soils with different properties (organic C, soil texture and atrazine application history), both unamended and treated with atrazine at field application rate. Measurements ot" the atrazine compounds were made at different time intervals (1, 3, 6, 9 and 12weeks) during a 3-month incubation period. Results showed that only hydroxyatrazine was detected in the extractable fraction ot" the unamended soils, with valúes remaining relatively constant throughout the incubation period. Atrazine addition notably increased the concentration of the parent compound and its degradation producís; deisopropylatrazine and hydroxyatrazine were the main metabolites detected in the extractable fraction of the treated soils, whereas deethylatrazine was not detected. After 7 days incubation, valúes of total extractable residues, expressed as percentage ot" initially added atrazine, ranged from 75 to 86% (25-68% of atrazine, 7-11% of hydroxyatrazine and 9-57% of deisopropylatrazine). The valúes decreased rapidly during the first 3 weeks of incubation, showing valúes of 2-8% in soils with higher atrazine application and from 28 to 30% in soils with lower application history. At the end of the incubation, 2-8% ot" total extractable residues were still detected (0-4% of atrazine, 2-3% of hydroxyatrazine and 0-2% of deisopropylatrazine), indicating a residual eft'ect of atrazine addition. These variations in the extractable fraction indicated that most added atrazine was rapidly degraded, especially in soils with higher application history.|
|Appears in Collections:||(IIAG) Artículos|