By : S. G. de Bussctti & E. A. Ferreiro
The process of adsorption‐desorption of the dicamba herbicide (3,6‐dichloro‐2‐methoxybenzoic acid) by 10 soils southwest of Buenos Aires (Argentine) and by calcium (Ca)‐montmorillonite, bayerite, and silica gel, was studied as a function of the applied concentration. Only two of soils studied readily adsorbed dicamba. The most important parameters in the soil with greater adsorption are low pH (5.15) and high organic matter content (5.6%). The remaining soils show negative adsorption and hydrophility of the soil colloids could account for this by preferential adsorption of water. The Ca‐montmorillonite, aluminum oxide, bayerite, and silica gel adsorbed dicamba. The extent of adsorption is small and the quantity adsorbed was characterized by Freundlich adsorption constants, which were used as an index to compare adsorbents and treatments. The analysis of the adsorption constants (k) and (1/n) shows that the reaction is irreversible and the adsorption is in the following order: bayerite > silica gel > Ca‐montmorillonite.
The process of adsorption‐desorption of the dicamba herbicide (3,6‐dichloro‐2‐methoxybenzoic acid) by 10 soils southwest of Buenos Aires (Argentine) and by calcium (Ca)‐montmorillonite, bayerite, and silica gel, was studied as a function of the applied concentration. Only two of soils studied readily adsorbed dicamba. The most important parameters in the soil with greater adsorption are low pH (5.15) and high organic matter content (5.6%). The remaining soils show negative adsorption and hydrophility of the soil colloids could account for this by preferential adsorption of water. The Ca‐montmorillonite, aluminum oxide, bayerite, and silica gel adsorbed dicamba. The extent of adsorption is small and the quantity adsorbed was characterized by Freundlich adsorption constants, which were used as an index to compare adsorbents and treatments. The analysis of the adsorption constants (k) and (1/n) shows that the reaction is irreversible and the adsorption is in the following order: bayerite > silica gel > Ca‐montmorillonite.
Yangzhou pioneer chemical CO.,LTD
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