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| Effects of adding shell powder with different particle sizes to soil on selenium and cadmium uptake in rice |
| Received:March 02, 2021 |
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| KeyWord:shell powder;cadmium;selenium;rice |
| Author Name | Affiliation | E-mail | | PAN Liping | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | | | TAN Jun | Nanning Institute of Agricultural Sciences, Nanning 530009, China | | | LIU Bin | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | | | XING Ying | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | | | HUANG Yanfei | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | | | CHEN Jinping | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | | | LIU Yongxian | Institute of Agricultural Resources and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Guangxi Selenium-rich Agricultural Research Center, Nanning 530007, China | liuyx27@163.com |
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| Abstract: |
| Shell is a passivating material that can be used for the remediation of heavy metals pollution. The purpose of this study is to clarify effects of different particle sizes of shell powder on the availability of cadmium and selenium in soil and on the absorption and accumulation of cadmium and selenium in rice. A plot field experiment was conducted by adding equal amounts of shell powder with different particle sizes to measure the contents of cadmium and selenium in different parts of rice plants. We further measured the soil pH, content of available cadmium, and the available selenium and valence contents. We aimed to thereby find the optimal shell particle size for rice cultivation. The results showed that the application of shell powder could significantly increase soil pH and reduce the available soil cadmium content; the particle size was inversely proportional to this effect. The available soil cadmium content after the incorporation of 10 mesh, 60 mesh, and 200 mesh shell powders decreased by 8.68%, 10.84% and 17.50% respectively, as compared to that of the control. Meanwhile, the available selenium content increased, and the exchangeable selenium was dominant. The smaller the particle size of shell powder, the more conducive it was for the conversion of exchangeable selenium to + 6 valence. The application of shell powder could facilitate a decrease in cadmium and an increase in selenium in rice. Compared with the control, the cadmium content in brown rice decreased by 9.62%~49.02%, while the selenium content increased by 4.31~5.58 times. The cadmium content in rice was significantly negatively correlated with the selenium content, among which the cadmium content in the brown rice treated with 60 mesh and 200 mesh shell powders met the National Pollution Standards of Food Safety(GB 2762-2017). Therefore, shell powders with a particle size of more than 60 mesh can be used as the remediation material to reduce the cadmium content and enrich selenium in rice contaminated by cadmium in practical production. |
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