SORPTION AND DESORPTION OF IMAZETHAPYR AND 5-HYDROXYIMAZETHAPYR IN MINNESOTA SOILS

被引:27
作者
GAN, JY
WEIMER, MR
KOSKINEN, WC
BUHLER, DD
WYSE, DL
BECKER, RL
机构
[1] UNIV MINNESOTA, DEPT AGRON & PLANT GENET, ST PAUL, MN 55108 USA
[2] UNIV MINNESOTA, USDA ARS, SOIL & WATER MANAGE RES UNIT, ST PAUL, MN 55108 USA
[3] UNIV MINNESOTA, USDA ARS, PLANT SCI RES UNIT, ST PAUL, MN 55108 USA
关键词
HYSTERESIS; FREUNDLICH ISOTHERMS; BOUND PESTICIDE RESIDUES; IMAZETHAPYR;
D O I
10.1017/S0043174500084228
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Laboratory batch equilibrium studies were conducted to evaluate the sorption-desorption behavior of imazethapyr and its major plant metabolite, 5-hydroxyimazethapyr, in three Minnesota soils. Sorption of both compounds on all soils was low, and pH did not significantly influence sorption in the range of 4.8 to 7.1. Less 5-hydroxyimazethapyr was sorbed than imazethapyr on the same soil. Once sorbed, both compounds were only partially desorbable from all soils. Significant hysteresis and formation of nonextractable residues indicate that the small amount of chemical sorbed is bound to selective surfaces with strong bonds. Webster clay loam had greater irreversibility than Waukegen silt loam and Estherville sandy loam soil. The hysteresis observed in desorption may be responsible for the difference between mobility estimations made from laboratory sorption studies and the limited mobility observed in field experiments.
引用
收藏
页码:92 / 97
页数:6
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