Effect of zinc and copper in the disaggregation of six soils of the Federal District, Brazil
DOI:
https://doi.org/10.24849/j.geot.2016.137.03Keywords:
disaggregation, copper, zinc, lateritic soilAbstract
The disaggregation effect of leachate from waste disposal sites on the solids of clay liners, with consequent alteration of mechanical and hydraulic properties, may be significant in lateritic tropical soils, in which clay-minerals are agglomerated and cemented by iron and aluminum oxides. Aggregation is generally measured by comparison between clay content valued in laboratory tests carried out with and without a chemical and/or mechanical disaggregating agent. This paper presents the behavior to chemical disaggregation by sodium hexametaphosphate and zinc and copper solutions (50 to 800 mg/L), and to physical disaggregation of six soils of the Federal District, Brazil, representing six classes of MCT (Miniature, Compacted, Tropical) classification for tropical soils. Zinc and copper caused chemical disaggregation of the investigated soils (copper more than zinc), on the other hand they promoted resistance against the disaggregation caused by ultrasound (zinc more than copper). NA and NA’ soils were little affected by the disaggregation agents, inasmuch as their clay content is very low. NS’ was the most affected soil by chemical disaggregation, and the least sensitive to improvement of resistance against disaggregation by ultrasound. Results indicate that copper solutions may cause more damage to clay liners than zinc solutions.
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