|
| Extraction of heavy metals from polluted soil by Na2EDTA and STPP |
| Received:July 01, 2015 |
| View Full Text View/Add Comment Download reader |
| KeyWord:STPP;Na2EDTA;lead;cadmium;copper;combined extraction |
| Author Name | Affiliation | E-mail | | LIU Li-fen | College of Urban Construction, University of South China, Hengyang 421001, China | | | ZHANG Xiao-wen | Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China | shawn_zhang@sina.com | | LI Mi | Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China | | | TANG Dong-shan | Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China | | | YAO Ya | Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China | | | PENG Ying | Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China | |
|
| Hits: 3983 |
| Download times: 3574 |
| Abstract: |
| Remediation of heavy metal polluted soils is critical to ensuring food and ecological security. In this study, the performance of sodium phosphate(STPP) and ethylenediamine sodium oxalate(Na2EDTA) alone and in combination on Pb, Cd and Cu extraction from soil was examined by batch extraction method. The effects of extractant concentration, reaction time and pH on the extraction efficiencies of heavy metals were also investigated. The changes of heavy metal fractions in soil before and after extraction were determined. Results indicated that both Na2EDTA and STPP had positive effects on extraction of heavy metal ions from polluted soil. The extraction capacity of heavy metals was lower for STPP than Na2EDTA, but was higher for combined extractant than single extractants at 5 mmol·L-1. However, the Pb and Cu extraction efficiencies were lower for combined than single extractants at concentration over 10 mmol·L-1. Raising pH decreased the extraction efficiency of combined extractant. The optimum extraction efficiency for combined extractant was found to be 5 mmol·L-1 of mixture concentration and 2 h vibration. The combined extractant reduced soil heavy metals through removing acid-exchangeable, reductable, and oxidizable fractions of heavy metals. |
|
|
|
