Long-term stability of KEtX/Cu(OH)(2) matrix in landfill leachates

In this study, the long-term stability of KEtX/Cu(OH)(2) matrix under early -period and late-period landfill leachates was evaluated using semi-dynamic leaching test (SDLT), X-ray diffractometer (XRD) and fourier transform inf rared (FTIR) techniques. The results of SDLT after 60-day periods of extrac tion indicated that the cumulative leaching of Cu was only 0.72% and 3.34% of the total Cu in the KEtX/Cu(OH)(2) matrix under early-period and late-pe riod landfill leachates, respectively. The investigation of crystallinity a nd functional groups between the leached KEtX/Cu(OH)(2) matrices after 1-da y and 60-day periods of extraction using XRD and FTIR indicated that the KE tX/Cu(OH)(2) matrices were perfectly unaffected by the extraction using ear ly-period and late-period landfill leachates during the 60-day leach time. Consequently, the KEtX/Cu(OH)(2) matrix had a stabilizing behavior extracte d in landfill leachates. (C) 1999 IAWQ Published by Elsevier Science Ltd. A ll rights reserved.