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Allocation and source attribution of lead and cadmium in maize (Zea mays L.) impacted by smelting emissions |
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| Authors: | Xiangyang Bi Xinbin Feng Yuangen Yang Grace PY Shin Guangle Qiu Taoze Liu |
| Institution: | a State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China b Key Laboratory of Biogeology and Environmental Geology, Ministry of Education, China University of Geosciences, Wuhan 430074, PR China c Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong d College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China |
| Abstract: | Plants grown in contaminated areas may accumulate trace metals to a toxic level via their roots and/or leaves. In the present study, we investigated the distribution and sources of Pb and Cd in maize plants (Zea mays L.) grown in a typical zinc smelting impacted area of southwestern China. Results showed that the smelting activities caused significantly elevated concentrations of Pb and Cd in the surrounding soils and maize plants. Pb isotope data revealed that the foliar uptake of atmospheric Pb was the dominant pathway for Pb to the leaf and grain tissues of maize, while Pb in the stalk and root tissues was mainly derived from root uptake. The ratio of Pb to Cd concentrations in the plants indicated that Cd had a different behavior from Pb, with most Cd in the maize plants coming from the soil via root uptake. |
| Keywords: | Lead Cadmium Pb isotopes Maize Atmospheric deposition Soil Zinc smelting China |
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