Journal of Guangxi Normal University(Natural Science Edition) ›› 2019, Vol. 37 ›› Issue (2): 188-193.doi: 10.16088/j.issn.1001-6600.2019.02.023

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Effects of Different Washing Solutions on the Desorption of Heavy Metals from a Lead-zinc Mine Soil

XU Tingting1, YU Qiuping1, QI Peiyi1, LIU Kehui2,3, LI Yi1,3, JIANG Yongrong3,4, YU Fangming1,3*   

  1. 1.College of Environment and Resource, Guangxi Normal University, Guilin Guangxi 541006, China;
    2.College of Life Science, Guangxi Normal University, Guilin Guangxi 541006, China;
    3.Key Laboratory of Karst Ecology and Environment Change of Guangxi Department of Education (Guangxi Normal University), Guilin Guangxi 541004, China;
    4.College of Life and Environmental Science, Guilin University of Electronic Technology, Guilin Guangxi 541004, China
  • Received:2018-03-13 Online:2019-04-25 Published:2019-04-28

Abstract: The desorption of Cd, Pb, Mn and Zn from lead-zinc mine soils with six common organic acids was investigated by using soil washing approach. EGTA,citricacid (CA),oxalic acid (OA),tartaric acid (TA),ascorbic acid (VC) and EDTA at the concentration of 0,2.5,5 and 10 mmol·L-1 were studied. Heavy metal contaminated soils were collected from a lead-zinc mine area in Rong’an County,Guangxi province.The results indicated that EDTA has the greatest efficiency on releasing Pb, Zn and Cd from soils among the six organic acids,and the best extraction time is 9 h. At 9 h,the removal rates of EDTA to soil Pb,Zn and Cd were 6.82%,6.72% and 3.87%,respectively.VC and CA showed the greatest removal efficiency to soil Mn and the release efficiency was enhanced with the increase of the acid concentration. At 10 mmol·L-1 concentration of VC and CA,the amount of released soil Mn was 4.59 and 4.28 times greater than that of the control. Under the VC treatment,the amount of released soil Mn increased with the extraction time during the first 9 h washing after which there was no significant increase of Mn release(P>0.05),therefore the best extraction time was also 9 h.

Key words: organic acids, EDTA, soil heavy metals, desorption

CLC Number: 

  • X53
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