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Correlation Between Dynamic Leach Test Results and Geochemical Observations

Published online by Cambridge University Press:  21 February 2011

Aaron Barkatt,
Pedro B. Macedo,
William Sousanpour,
Alisa Barkatt,
Morad A. Boroomand,
Peter Szoke and
Victor L. Rogers
Aaron Barkatt
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Pedro B. Macedo
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
William Sousanpour
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Alisa Barkatt
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Morad A. Boroomand
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Peter Szoke
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Victor L. Rogers
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
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Abstract

A test method based on partial leachant exchange at constant intervals until leachate concentrations become stabilized has been used to obtain a data-base in evaluating long-term leaching patterns. Applied to basalt and granite specimens and compared with ground-water analyses, correlations which can be used in long-term leachability extrapolations have been established. They are based on the following principles: (i) Control of solubilities of major components by combined aluminosilicate species; (ii) Continued increase in levels of soluble species, e.g. Na+ and Cl−, with time; (iii) Initial rapid leaching of SO4 2−, along with Ca2+ and K+, followed by slowing down, probably due to the presence of selectively leachable phases; (iv) Initial retardation of Mg and Fe leaching followed by regrowth as sorption sites become saturated.

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References

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