Source attributions of heavy metals in rice plant along highway
in Eastern China |
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Authors: | Jinfei Feng Yinxi Wang Jian Zhao Liqun Zhu Xinmin Bian and Weijian Zhang |
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Institution: | 1. Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China. E-mail: iffeng22@ 163.com 2. Center of Modern Analysis, Nanjing University, Nanjing 210093, China. E-mail: yxwang@nju.edu.cn 3. Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China. E-mail: iffeng22@ 163.com;Institute of Crop Science, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Ecology,Physiology & Production, Ministry of Agriculture, Beijing 100081, China |
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Abstract: | Air and soil pollution from traffic has been considered as a critical issue to crop production and food safety, however, few efforts have
been paid on distinguish the source origin of traffic-related contaminants in rice plant along highway. Therefore, we investigated metals
(Pb, Cd, Cr, Zn and Cu) concentrations and stable Pb isotope ratios in rice plants exposed and unexposed to highway traffic pollution
in Eastern China in 2008. Significant differences in metals concentrations between the exposed and unexposed plants existed in leaf for
Pb, Cd and Zn, in stem only for Zn, and in grain for Pb and Cd. About 46% of Pb and 41% of Cd in the grain were attributed to the
foliar uptake from atmosphere, and there were no obvious contribution of atmosphere to the accumulations of Cr, Zn and Cu in grain.
Except for Zn, all of the heavy metals in stem were attributed to the root uptake from soil, although significant accumulations of Pb and
Cd from atmosphere existed in leaf. This indicated that different processes existed in the subsequent translocation of foliar-absorbed
heavy metals between rice organs. The distinct separation of stable Pb isotope ratios among rice grain, leaf, stem, soil and vehicle
exhaust further provided evidences on the different pathways of heavy metal accumulation in rice plant. These results suggested that
further more attentions should be paid to the atmospheric deposition of heavy metals from traffic emission when plan crop layout for
food safety along highway. |
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Keywords: | source origin traffic heavy metal stable Pb isotope rice plant |
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