EDTA 辅助浸提污染土壤中的 Pb 和 Cd。
EDTA-assisted leaching of Pb and Cd from contaminated soil.
机构信息
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China.
出版信息
Chemosphere. 2017 Jan;167:422-428. doi: 10.1016/j.chemosphere.2016.10.034. Epub 2016 Oct 14.
Lead (Pb) and cadmium (Cd) contamination of soil and its harmful effects on human and environmental health have been one concern. In this study, batch and column leaching experiments were conducted to investigate the effects of two EDTA-assisted leaching methods, continuous and intermittent (dry-wet alternate), on the removal of Pb and Cd from contaminated soil. Total content and fractions of Pb and Cd at every 1 cm soil column depth were analyzed before and after the leaching. The results indicated that continuous leaching removed 75.43% of Pb (19.370 mg) and 53.21% of Cd (6.168 mg) and intermittent leaching removed 78.08% of Pb (20.051 mg) and 57.37% of Cd (6.650 mg), which showed intermittent leaching removed more Pb and Cd, but didn't differ significantly (P > 0.05) compared to the continuous leaching. In both leaching methods, total Pb and Cd content in all soil depths reduced after leaching. The two leaching methods made no significant differences in Pb and Cd distributions at different depths of the soil column.
土壤中的铅（Pb）和镉（Cd）污染及其对人类和环境健康的有害影响一直是人们关注的问题。本研究采用批式和柱式淋溶实验，研究了两种 EDTA 辅助淋洗方法（连续和间歇（干湿交替））对污染土壤中 Pb 和 Cd 去除的影响。在淋洗前后，分析了每 1cm 土壤柱深度的 Pb 和 Cd 的总量和形态。结果表明，连续淋洗去除了 75.43%的 Pb（19.370mg）和 53.21%的 Cd（6.168mg），间歇淋洗去除了 78.08%的 Pb（20.051mg）和 57.37%的 Cd（6.650mg），间歇淋洗去除了更多的 Pb 和 Cd，但与连续淋洗相比差异不显著（P>0.05）。在两种淋洗方法中，淋洗后所有土壤深度的总 Pb 和 Cd 含量均降低。两种淋洗方法在土壤柱不同深度的 Pb 和 Cd 分布上没有显著差异。
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