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Extraction of Cd and Pb from contaminated-paddy soil with EDTA, DTPA, citric acid and FeCl3 and effects on soil fertility

EDTA、DTPA、柠檬酸和FeCl3 对污染稻田土壤镉铅的去除及土壤肥力的影响

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Abstract

Potentially toxic metals, Cd and Pb in paddy soil, have important meanings for safety of rice. A comparison extraction of Cd and Pb with EDTA, DTPA, citric acid, and FeCl3 and effects on soil fertility was studied. Results indicate that about 59% and 63% of soil Cd and Pb were simultaneously removed by 10 g/L EDTA at pH 5 with a soil/extractant ratio of 1:10 (W/V) for 30 min while 52% and 51% by 5 g/L DTPA. Acid extractable and reducible Cd by EDTA and DTPA contributed 58% and 53% of the removals and acid extractable and reducible Pb were about 49% and 41%, respectively. Slight changes of soil fertility, including pH, cation exchange capacity, organic matter, and soil extractable phosphorus, were observed. Extractions of citric acid and ferric chloride, however, were only efficient for Cd and the soil pH was decreased significantly. This study suggests that EDTA and DTPA can be considered as suitable agents to clean up the paddy soils contaminated with potentially toxic metals.

摘要

潜在有害金属镉和铅对水稻的安全生产有着重要意义. 本文对比研究了EDTA、DTPA、柠檬酸和FeCl3 对镉和铅的去除能力以及对土壤肥力的影响. 结果表明, 选取固液比1:10 振荡30 min 用10 g/L EDTA(pH 5)可去除59% Cd 和 63% Pb, 而在同等条件下, 5 g/L DTPA 可去除52% Cd 和51%Pb. EDTA 的土壤淋出液含58%酸可提取态和可还原态Cd, 49%酸可提取态和可还原态Pb, DTPA 淋出液中含53%和41%. 土壤pH 值、阳离子交换量、有机质、土壤有效磷变化较小. 而柠檬酸和氯化铁仅对Cd 淋洗有效, 且淋洗后土壤pH 值下降显著. 研究表明EDTA 和DTPA 可以作为潜在有害金属污染稻田土壤净化的合适淋洗剂.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Fang Liang  (梁芳), Zhao-hui Guo  (郭朝晖), Shu-hui Men  (门姝慧), Xi-yuan Xiao  (肖细元) & Chi Peng  (彭驰)

  2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China

    Long-hua Wu  (吴龙华) & Peter Christie

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  1. Fang Liang  (梁芳)
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Correspondence to Zhao-hui Guo  (郭朝晖).

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Foundation item: Project(2015BAD05B02) supported by the National Science and Technology Support Program, China

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Liang, F., Guo, Zh., Men, Sh. et al. Extraction of Cd and Pb from contaminated-paddy soil with EDTA, DTPA, citric acid and FeCl3 and effects on soil fertility. J. Cent. South Univ. 26, 2987–2997 (2019). https://doi.org/10.1007/s11771-019-4230-4

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