Premium
Influence of soil characteristics on the adsorption of pirimicarb
Author(s) -
SanchezCamazano M.,
SanchezMartin M. J.
Publication year - 1988
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620070704
Subject(s) - adsorption , montmorillonite , soil water , freundlich equation , organic matter , chemistry , environmental chemistry , clay minerals , soil organic matter , pirimicarb , mineralogy , soil science , pesticide , geology , organic chemistry , agronomy , biology
A study was made of the influence of soil properties and composition on the adsorption of pirimicarb (2‐dimethylamino‐5,6‐dimethylpyrimidin‐4‐yl‐dimethyl carbamate). Twenty‐one soil samples with different characteristics were used to study the following parameters: adsorption by natural soils, correlations between adsorption and soil properties, and effect of the elimination of organic matter on adsorption. The adsorption isotherms obtained are, in general, of the L type of the Giles classification, in all cases fitting the Freundlich equation. A highly significant correlation between the distribution coefficient ( K d ) and the clay content was observed. For the soils containing montmorillonite in the clay fraction, a fairly significant correlation was seen between K d and the montmorillonite content. The maximum variability in adsorption for all the soils is explained by the multiple correlation between K d and the values of the clay plus organic matter and pH ( R 2 = 0.68). In the soils containing montmorillonite, the correlations between K d and the organic matter and smectite contents account for 80% of the variability in adsorption. Adsorption by the oxidized soils shows that organic matter can block the adsorption of the pesticide by the clay.