Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 24, Issue 10, Pages 1799-1805Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(11)61010-3
Keywords
Cd-contaminated soil; immobilization remediation; sepiolite; soil quality
Categories
Funding
- National Natural Science Foundation of China [21177068, 40901154, 21107056]
- Program for Distinguished Scholar and Innovative Team of MOA [2012-jcrc-xym]
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The effects of immobilization remediation of Cd-contaminated soils using sepiolite on soil pH, enzyme activities and microbial communities, TCLP-Cd (toxicity characteristic leaching procedure-Cd) concentration, and spinach (Spinacia oleracea) growth and Cd uptake and accumulation were investigated. Results showed that the addition of sepiolite could increase soil pH, while the TCLP-Cd concentration in soil was decreased with increasing sepiolite. The changes of soil enzyme activities and bacteria number indicated that a certain metabolic recovery occurred after the sepiolite treatments, and spinach shoot biomass increased by 58.5%-65.5% in comparison with the control group when the concentration of sepiolite was <= 10 g/kg. However, the Cd concentrations in the shoots and roots of spinach decreased with an increase in the rate of sepiolite, experiencing 38.4%-59.1% and 12.6%-43.6% reduction, respectively, in contrast to the control. The results indicated that sepiolite has the potential for success on a field scale in reducing Cd entry into the food chain.
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