SORPTION OF ATRAZINE AND TRIFLURALIN IN RELATION TO THE PHYSIOCHEMICAL CHARACTERISTICS OF SELECTED SOILS

被引:50
作者
FRANCIOSO, O
BAK, E
ROSSI, N
SEQUI, P
机构
[1] Institute of Agricultural Chemistry, University of Bologna, 40127 Bologna
关键词
ATRAZINE; TRIFLURALIN; SOIL SORPTION COEFFICIENT (KD); SOIL SORPTION CONSTANT (KOC);
D O I
10.1016/0048-9697(92)90172-O
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The sorption of two types of herbicide, atrazine (6-chloro-N2-ethyl-N4- isopropyl-1,3,5-triazine-2,4-diamine) and trifluralin (alpha,alpha,alpha-trifluoro-2,6-dinitro-N,N-dipropyl- p-toluidine), was studied in four different soils representative of the intensively cultivated soils of the Po Valley (northern Italy). To study the effect of the organic matter content, experiments were carried out with one of the soils after the organic matter had been removed by a sodium hypochlorite treatment. The sorption ability for atrazine and trifluralin was decreased considerably when the soil with high organic matter content was treated with sodium hypochlorite; moreover, the sorption of trifluralin also seems to be influenced by the inorganic components of the soil. In comparison to atrazine, the sorption of trifluralin by the different soils was in all cases very high. Using increasing concentrations of herbicide the sorption coefficient (K(d)) for each of the four soils was calculated together with the relative sorption constant (K(oc)) based on the organic carbon content of the soil. The values of K(f) and 1/n in the Freundlich equation for atrazine and trifluralin adsorbed by the four soils were related to the characteristics of the soils.
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页码:503 / 512
页数:10
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