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Effective Role of Biochar, Zeolite and Steel Slag on Leaching Behavior of Cd and Its Fractionations in Soil Column Study
- Bashir, Saqib, Salam, Abdus, Rehman, Muzammal, Khan, Shahbaz, Gulshan, Allah Bakhsh, Iqbal, Javaid, Shaaban, Muhammad, Mehmood, Sajid, Zahra, Anaam, Hu, Hongqing
- Bulletin of environmental contamination and toxicology 2019 v.102 no.4 pp. 567-572
- ammonium nitrate, application rate, biochar, cadmium, fractionation, leachates, leaching, polluted soils, remediation, slags, soil profiles, steel, toxicity, zeolites
- Remediation of cadmium (Cd) from contaminated soils is considered a complicated task of environmental safety. A column leaching experiment was planned to estimate the influence of biochar (BC), zeolite (ZE) and steel slag (SL) at 1.5% and 3% application rate on Cd leaching behavior and chemical fractionation in contaminated soil. A sequential extraction procedure, the European Community Bureau of Reference (BCR), Toxicity Characteristic Leaching Procedure (TCLP) and NH₄NO₃ were performed after leaching was completed. The soluble portion of Cd was decreased by 36.3%, 18.4% and 28.7% and Cd contents in leachate were decreased by 44.8%, 30% and 31.3% after BC, ZE and SL addition at 3% rate, respectively over control soil. The greater reduction in TCLP extractable Cd was observed by 29.6% with BC and 22.4% with ZE and 25.7% with SL at 3% application rate. Overall, biochar can be considered an efficient soil amendment to reduce Cd leaching as well as increased its stabilization within soil profile.