Ryegrass uptake of soil Cu/Zn induced by EDTA/EDDS together with a vertical direct-current electrical field.
This paper summarizes a study on the application of vertical electric direct-current (DC) to control the migration of metal complexes in soil columns when EDTA/[S,S]-ethylenediaminedisuccinic acid (EDDS) is used to enhance ryegrass uptake of Cu/Zn from contaminated soil. The results show that application of EDTA/EDDS significantly increased ryegrass uptake of Cu/Zn when compared with no EDTA/EDDS application and the Cu/Zn concentrations in all soil solutions sampled at three different levels of the soil column, i.e. 15, 30 and 50 cm. Application of vertical DC electrical field (1.0 V cm(-1)) through top anode (close to the surface) and bottom cathode caused redistribution of Cu/Zn concentrations. Copper/Zn concentrations significantly decreased in soil pore fluid that were sampled in the bottom sections of the column, suggesting an efficient control of the leaching risk of the Cu/Zn complexes when the vertical electrical field is applied. The shoot Cu concentration of ryegrass in the treatments with EDTA/EDDS and electrical field together was 0.46/0.61 times higher than that in treatments without electrical fields.
Zhou
Dong-Mei
DM
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. dmzhou@issas.ac.cn <dmzhou@issas.ac.cn>
Chen
Hai-Fen
HF
Cang
Long
L
Wang
Yu-Jun
YJ
D003300:Copper / Q000378:metabolism*; D004492:Edetic Acid / Q000494:pharmacology*; D004558:Electric Stimulation; D052918:Environmental Restoration and Remediation; D005029:Ethylenediamines / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D008129:Lolium / Q000187:drug effects / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D013386:Succinates / Q000494:pharmacology*; D015032:Zinc / Q000378:metabolism*
D005029:Ethylenediamines; D012987:Soil; D013386:Succinates; C041447:N,N'-ethylenediamine disuccinic acid; D003300:Copper; D004492:Edetic Acid; D015032:Zinc