中国西北地区黄土改良疏浚沉积物中重金属的浸出性。
Leachability of heavy metals in loess-amended dredged sediment from Northwest of China.
机构信息
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province and Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou. 730020, China.
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province and Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.
出版信息
Ecotoxicol Environ Saf. 2019 Nov 15;183:109561. doi: 10.1016/j.ecoenv.2019.109561. Epub 2019 Aug 19.
Considerable studies have been done on heavy metal removing from aqueous solutions using loess. However, application of loess to heavy metal contaminated sediment is limited. The present study was to determine the effectiveness of loess to immobilize Cu, Zn, Cd and Pb in sediment. The loess was incubated with 10 kg wet sediment in doses of 0, 0.5, 1, 2, 5, 10 and 20 kg for 70 d and then subjected to the toxicity characteristic leaching procedure (TCLP). The possible mechanisms for heavy metal immobilization were illustrated using X-ray diffraction and scanning electron microscope. Results from TCLP confirmed loess reduced leaching rate of Cu and Zn achieving up to 42.4% and 17.6% reductions, respectively, when compared with untreated sediment. The loess could significantly immobilize Cu and Zn in sediment, and the optimum dose of loess in 10 kg wet sediment was 5 kg. However, loess was inefficient for Cd and Pb immobilization. Correlation analysis showed that TCLP extraction method could be used to predict the toxicity of Cu, Zn, Cd and Pb in the loess-amended sediment. The pH, EC, OM and CaCO of the loess-amended sediment played predominant roles in the TCLP leaching test.
已经有大量研究利用黄土来去除水溶液中的重金属。然而，黄土在重金属污染沉积物中的应用受到限制。本研究旨在确定黄土对固定沉积物中 Cu、Zn、Cd 和 Pb 的有效性。将黄土与 10kg 湿沉积物以 0、0.5、1、2、5、10 和 20kg 的剂量在 70d 内进行孵育，然后进行毒性特征浸出程序（TCLP）。使用 X 射线衍射和扫描电子显微镜说明了重金属固定的可能机制。TCLP 的结果证实，与未处理的沉积物相比，黄土降低了 Cu 和 Zn 的浸出率，分别达到了 42.4%和 17.6%的减少。黄土可以显著固定沉积物中的 Cu 和 Zn，在 10kg 湿沉积物中黄土的最佳剂量为 5kg。然而，黄土对 Cd 和 Pb 的固定效果不佳。相关分析表明，TCLP 提取方法可用于预测黄土改良沉积物中 Cu、Zn、Cd 和 Pb 的毒性。黄土改良沉积物的 pH 值、EC 值、OM 值和 CaCO3 值在 TCLP 浸出试验中起主要作用。
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