Journal
WASTE MANAGEMENT
Volume 22, Issue 7, Pages 783-789Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0956-053X(02)00039-9
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The leachability of some metals (Al, As, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Ti, Zn) from fly ashes was studied in the presence of ethylenediamine tetraacetic acid (EDTA) and naturally occurring complexing agents-humic acids (HAs). Secondary complex-forming equilibria taking place in the leachates increase significantly the leached amounts of most metals. Kinetic experiments showed that almost the whole available amounts of metals are leached from fly ash within a time period of several hours (mostly within 20 h), with exceptions of matrix constituents (typically aluminium), which are released more slowly. (C) 2002 Published by Elsevier Science Ltd.
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