Effects of particle size on the metal extraction with citrate in contaminated soils
- Effects of particle size on the metal extraction with citrate in contaminated soils
- 양중석; 이승학; 권만재
- Issue Date
- ACS National Meeting
- The contamination of toxic metals in soil has been a serious
environmental problem due to their toxicity and environmental
risk. Among various remediation technologies for metal
contaminated soils, soil washing is considered as a more powerful
and convenience technology because of easy operation and
permanent removal of metals from soil. To find optimum
extraction conditions for target metals such as Cu, Cr, Pb, and Zn in
soil washing process, we investigated the metal extraction
potential of citrate according to soil particle size, solution pH, and
concentrations of citrate using liquid-solid partitioning as a
function of extractant pH with parallel batch extraction procedures.
The extraction kinetics was also tested with three different particle
sizes of soil. The metal extraction was significantly affected by the
extractant pH and the soil particle sizes. The metal fractionation in
soil was analyzed using sequential extraction procedure before and
after citrate extractions. The extracted fraction of metals was
varied by the characteristics of each metal. These results imply
both the physical-chemical characteristics of soils and the
fractionation and speciation of metals in soils and extract solutions
should be considered in soil washing process.
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