自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 11    November 2019

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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
LIANG Fang(梁芳)1, GUO Zhao-hui(郭朝晖)1, MEN Shu-hui(门姝慧)1, XIAO Xi-yuan(肖细元)1,PENG Chi(彭驰)1, WU Long-hua(吴龙华)2, Peter CHRISTIE2

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science,
Chinese Academy of Sciences, Nanjing 210008, China

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.

 

Key words: contaminated paddy soil; soil washing; potentially toxic metals; speciation; soil fertility

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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