The Combination of Na2EDTA and Reducing Organic Acid on Remediation of Soil Contaminated by Heavy Metals
| Autor: | Yun Song Liu, Jia Jun Chen, Meng Wei |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
021110 strategic defence & security studies Cadmium Waste management Environmental remediation Mechanical Engineering Oxalic acid 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Ascorbic acid 01 natural sciences chemistry.chemical_compound chemistry Mechanics of Materials Environmental chemistry Smelting General Materials Science Chelation Arsenic 0105 earth and related environmental sciences Organic acid |
| Zdroj: | Key Engineering Materials. 744:531-535 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.744.531 |
| Popis: | Washing tests using a typical chelating agent (Na2EDTA) and two reducing organic acids (oxalic and ascorbic acid) were conducted to remediate soil contaminated by heavy metals at a former metal smelter. Removal efficiencies of arsenic, cadmium, copper and lead under Na2EDTA washing enhanced by reducing organic acid were tested with washing time and steps. Results showed that the addition of reducing acid increased the overall removal efficiencies of metals in some extent. The combination of Na2EDTA and oxalic acid was effective in removing arsenic and copper, while the combination of Na2EDTA and ascorbic acid was more effective in removing cadmium and lead. Washing process included the rapid desorption (20~60 min) and the rate-limited dissolution. Most available contents of metals were extracted within an hour. Multi-step washing was more effective than single washing. However, secondary washing was sufficient for remediation. So the washing conditions should be identified prudently. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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