Resources Processing
Online ISSN : 1349-9262
Print ISSN : 1348-6012
ISSN-L : 1348-6012
Original Paper
Extraction of Lead from Contaminated Soils with EDTA and EDDS
Masakazu NIINAEKoudai NISHIGAKI
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JOURNAL FREE ACCESS

2009 Volume 56 Issue 2 Pages 64-67

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Abstract

The biodegradable chelating agents [S,S]-ethylenediaminedisuccinic acid (EDDS) and the low biodegradable chelating agent ethylenediaminetetraacetic acid (EDTA) were investigated for their removal efficiency of lead from soil by soil washing.
In the soil washing tests, the removal efficiency of lead with EDTA was high in the wide pH range and the efficiency of lead removal with EDDS increased with increasing pH. However, EDDS has no effect on the removal of lead in the acidic region below pH 5.5. Acid contribution was predominant for the removal of lead with EDDS below pH 5.5 and the complexation between EDDS and lead were negligible.
The reaction rates for extraction of lead with EDTA and EDDS were represented by the volume reaction model. The activation energies of these extraction reactions are over 55 kJ/mol and the apparent reaction rate constants are not affected by the stirring speeds, therefore it is considered that these extraction reactions are chemically controlled.

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© 2009 The Resources Processing Society of Japan
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