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5636375 
Journal Article 
Flushing of a Pb(II) contaminated soil using HCl, EDTA, and CaCl sub(2) 
Reed, BE; Carriere, PC; Moore, R 
1996 
Yes 
Journal of Environmental Engineering
ISSN: 0733-9372
EISSN: 1943-7870 
122 
1 
48-50 
WOS:A1996TL83200009 
Flushing of a Pb(II) synthetically contaminated sandy loam using 0.1 N HCl, 0.01 M EDTA, and 1 M CaCl sub(2) was investigated in the continuous-flow (column) mode. Initial Pb soil concentrations ranged from 500 to 600 mg/kg. Pb-removal efficiencies (and final soil Pb concentrations) for HCl, EDTA, and CaCl sub(2) were 85% (77 mg/kg Pb), 100% ( approximately 0 mg/kg Pb), and 78% (135 mg/kg Pb), respectively. Given that HCl and CaCl sub(2) could not reduce the soil Pb to background levels ( approximately 25 mg/kg) for a synthetically contaminated soil brings into doubt their effectiveness in remediating actual contaminated soils where metal retention would be much stronger. While EDTA removed all lead (indigenous and "artificial"), its treatment and reuse and possible adverse health effects makes its use difficult. The final soil pH for HCl was near 1, raising the concern of increased contaminant mobility, decreased soil productivity, and adverse changes in the soil's chemical and physical structure due to mineral dissolution. Final soil pHs for EDTA and CaCl sub(2) ranged between 4.85 and 5.2. 
hydrogen chloride; calcium chloride; Pollution Abstracts; cleaning process; heavy metals; chemical treatment; soil remediation; pollution clean-up; P 5000:LAND POLLUTION