Lime and Phosphate Amendment Can Significantly Reduce Uptake of Cd and Pb by Field-Grown Rice

Rongbo Xiao, Zehong Huang, Xiaonuo Li, Weiping Chen, Yirong Deng and Cunliang Han
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Rongbo Xiao: Key Laboratory of Contaminated Sites Management and Remediation of Guangdong Province, Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, Guangdong, China
Zehong Huang: Key Laboratory of Contaminated Sites Management and Remediation of Guangdong Province, Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, Guangdong, China
Xiaonuo Li: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Weiping Chen: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Yirong Deng: Key Laboratory of Contaminated Sites Management and Remediation of Guangdong Province, Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, Guangdong, China
Cunliang Han: Key Laboratory of Contaminated Sites Management and Remediation of Guangdong Province, Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, Guangdong, China

Sustainability, 2017, vol. 9, issue 3, 1-10

Abstract: Agricultural soils are suffering from increasing heavy metal pollution, among which, paddy soil polluted by heavy metals is frequently reported and has elicited great public concern. In this study, we carried out field experiments on paddy soil around a Pb-Zn mine to study amelioration effects of four soil amendments on uptake of Cd and Pb by rice, and to make recommendations for paddy soil heavy metal remediation, particularly for combined pollution of Cd and Pb. The results showed that all the four treatments can significantly reduce the Cd and Pb content in the late rice grain compared with the early rice, among which, the combination amendment of lime and phosphate had the best remediation effects where rice grain Cd content was reduced by 85% and 61%, respectively, for the late rice and the early rice, and by 30% in the late rice grain for Pb. The high reduction effects under the Ca + P treatment might be attributed to increase of soil pH from 5.5 to 6.7. We also found that influence of the Ca + P treatment on rice production was insignificant, while the available Cd and Pb content in soil was reduced by 16.5% and 11.7%, respectively.

Keywords: soil amendments; soil remediation; heavy metal; paddy soil; stabilization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2017
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