PERFORMANCE AND STABILITY OF THE ORGANOSILICONE SURFACTANT L-77 - EFFECT OF PH, CONCENTRATION, AND TEMPERATURE

被引:82
作者
KNOCHE, M [1 ]
TAMURA, H [1 ]
BUKOVAC, MJ [1 ]
机构
[1] MICHIGAN STATE UNIV,DEPT HORT,E LANSING,MI 48824
关键词
D O I
10.1021/jf00001a041
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Studies on the effect of the organosilicone surfactant Silwet L-77 (0.1% w/v) on uptake of [C-14]GA3 (0.5 mM GA3, pH 3.0) by sour cherry leaves (Prunus cerasus L. Montmorency) showed a significant decline in GA3 absorption when the treatment solution was prepared 12 h prior to application compared to a freshly prepared solution. Surface tension of a freshly prepared solution (22.4 mN m-1) increased rapidly after a 76-min lag period. Gas chromatographic analysis revealed that Silwet L-77 degraded at pH 3.0 with a half-life of 43 min. Degradation velocity was dependent on pH. Slopes of the surfactant (0.1%) degradation curves at pH 3, 4, 5, 9, and 10 were 361.9, 69.2, 12.3, 6.2, and 14.8 mN m-1 day-1, respectively. Duration of the lag phase was linearly related with concentration between 0.025 and 0.4%. No lag phase was apparent below the critical micelle concentration (cmc = 0.008%). Degradation increased significantly with an increase in temperature from 15 to 35-degrees-C. A related surfactant, Silwet L-7607, and two experimental organosilicone surfactants (0.1% and pH 3) also degraded significantly within 3 h. The significance of this degradation is discussed in relation to spray application.
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页码:202 / 206
页数:5
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