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| Effect of chelating agents on remediation of cadmium and arsenic complex contaminated soil using oil sunflower |
| Received:May 23, 2019 |
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| KeyWord:farmland;heavy metal;oil sunflower;chelating agent;phytoremediation;extraction technology |
| Author Name | Affiliation | E-mail | | HAN Nian | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yi-zong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yizonghuang@126.com | | WEI Xiang-dong | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | TIE Bai-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | ZHANG Sheng-nan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Bing-shuo | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | BAO Qiong-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yong-chun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| To identify measures to improve the heavy metal extraction efficiency of oil sunflower on farmland soil, the effect of different chelating agents (NTA, EGTA, EDDS, and EDTA) on the remediation of Cd and As complex-contaminated soil by oil sunflower were studied. The results showed the application of the four different chelating agents had little effect on the biomass of roots, stems, leaves, disk, and grain of oil sunflower. Different chelating agents had different effects on Cd and As concentrations and accumulation in different organs of the oil sunflower. Compared with the CK treatment, the application of NTA, EGTA, EDDS, and EDTA increased the Cd concentration in oil sunflower disk by 30.2%, 55.1%, 41.9%, and 43.3%, respectively, and the As concentration in oil sunflower root increased by 23.6%, 18.1%, 15.6%, and 15.4%, respectively. However, the effect on Cd concentration in oil sunflower grains and stems was not significant. Treatment with NTA, EGTA, EDDS, and EDTA increased the total Cd accumulation of oil sunflower plants by 32.8%, 45.3%, 40.5%, and 41.6%, respectively, but had no significant effect on the accumulation of As in oil sunflower. The four chelating agents had different effects on the Cd and As enrichment coefficients of oil sunflower but had no significant effect on Cd and As transport coefficients. Treatment with NTA and EDTA resulted in a decrease of 21.1% and 25.0%, respectively, in soil Cd concentrations and a decrease of 18.1% and 14.3%, respectively, in soil As concentrations. These four chelating agents can be used to improve the remediation efficiency of oil sunflower on Cd and As contaminated soil. |
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