1887

oa Agrochemophysica - Die spesifieke adsorpsie van koper deur kleiminerale en grondfraksies

Volume 3, Issue 1
  • ISSN : 0302-7112

 

Abstract

The specific adsorption of copper by clay minerals and soil fractions. The maximum specific adsorption capacity for copper of these soil clays is much larger than that of the pure clay minerals. Soil clays adsorbed approximately 1100 ?g Cu per g of clay, as compared with 300 jxg per g for pure clay minerals. A fairly large amount of copper was also adsorbed by the silt fraction. Furthermore, copper adsorption by these materials involved at least two mechanisms or positions. The adsorption capacity of position 2 with the largest affinity for copper was much smaller than the total adsorption capacity of these samples. The affinity for copper of position 2 of the soil clay was also much larger in the presence than in the absence of the organic matter fraction. The adsorption capacity was also affected by factors such as pH and cations present. Very little copper was adsorbed at pH 4,9 by kaolinite, while montmorillonite at the same pH, could adsorb a fairly large amount of copper. A relatively large and constant amount of copper (40 per cent) could not be desorbed by 2,5 per cent acetic acid in the case of montmorillonite. For the soil clay fractions, however, a maximum of only 25 per cent was not extractable. The removal of the organic matter from the clay did not affect size of the non-exchangeable fraction. All the copper could be desorbed from the one silt sample, against 84 per cent from the other.

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/content/agro/3/1/AJA03027112_87
1971-01-01
2020-12-04

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