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| Bioavailability of arsenic and cadmium, and their cumulative control in rice grown on arsenic-cadmium-contaminated paddy soils |
| Received:October 01, 2017 |
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| KeyWord:cadmium;arsenic;combined pollution;bamboo charcoal;chaff carbon;flooding;paddy soils |
| Author Name | Affiliation | E-mail | | LIYUAN Xing-lu | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | YE Chang-cheng | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | LIU Yu-ling | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | YANG Rui-jia | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | HE Zhong-xiang | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | LIU Xiao-li | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | | | TIE Bo-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Hunan Province, Changsha 410013, China | tiebq@qq.com | | SUN Jian | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | |
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| Abstract: |
| In the present study, the arsenic(As) and cadmium(Cd)-contaminated soil from a mining area of Hunan Province was collected to study the effects of different treatments(CK:wet irrigation, WF:agronomic measure flooding, ZC:bamboo charcoal, ZF:bamboo charcoal with irrigation, GC:chaff carbon, GF:chaff carbon with irrigation) on the bioavailability of As and Cd in soil and their accumulation in brown rice. The results showed that the pH increased by 0.12~0.72 units in all the six treatments, which showed an increasing trend initially, and then decreased to neutral. Compared with CK, the Eh of soil subjected to other five treatments showed a decreasing trend. However, the Eh of soil subjected to treatments ZC and GC were significantly higher than that of the treatments WF, ZF, and GF flooded with biochar during the same growth stage, and was maintained in a weak reductive state. The concentration of available Cd, acid extractables, and TCLP extractables significantly decreased, while the concentration of available As and TCLP extractables significantly increased among all treatments. The content of Cd in brown rice subjected to the treatments WF, ZF, and GF flooded with biochar decreased by 51.46%~57.28%, and the optimal inhibition effect for Cd was achieved by the treatments GF, which was significantly different from that of ZF treatment. The content of As in the grain reached 0.29, 0.32 mg·kg-1, and 0.30 mg·kg-1, 39.74%~53.58% higher than that of the CK. There was no significant difference among the three groups. The content of Cd in brown rice decreased by 16.50% and 39.81%, while the content of As in brown rice increased by 27.24% and 12.23%. However, there was no significant difference between the treatment groups GC and CK. These results indicate that the treatments WF, ZF, GF, and ZC can reduce the bioavailability of Cd in soils, which will be of great significance to remediate Cd-contaminated paddy soils. However, it can increase the bioavailability of As in soil. Furthermore, GC treatment with single addition of biochar can be used in Cd-As-contaminated farmland soils, to obtain information for food production on Cd-As-contaminated paddy soils. |
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