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Aspects of the adsorption of pirimicarb by smectites and soils
Author(s) -
SánchezCamazano M.,
SánchezMartín M. J.
Publication year - 1987
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19871500404
Subject(s) - clay minerals , adsorption , montmorillonite , chemistry , silicate , soil water , freundlich equation , inorganic chemistry , environmental chemistry , mineralogy , geology , soil science , organic chemistry
A study was conducted to examine the adsorption and interaction mechanism of pirimicarb with smectites and soils. Studies were carried out in pesticide‐smectite or soil‐water systems and in pesticide‐smectite‐organic solvent systems, using homoionic samples of montmorillonite, smectites of different layer charge and soils with smectite in their clay fraction. The adsorption isotherms obtained at 30° and 45°C follow the empirical equation of Freundlich. In the adsorption of the pesticide by soils a highly significant correlation was seen between adsorption (distribution coefficient) and the content of smectite in them. In the studies in organic medium the formation of a smectite‐pirimicarb bilayer complex with a basal d 001 spacing of 18.55 Å was observed; the formation of this is also related to the nature of the interlayer cation and the layer charge of the smectite. According to the I.R. results, the interlayer cations of the silicate and the oxygen atom of the C–O group of the pesticide molecule are involved in the interaction mechanism.