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Speciation and distribution of arsenic and localization of nutrients in rice grains
文献类型：期刊论文
| 作者 | Meharg, A. A.; Zhu, Y. G.; Lombi, E.; Scheckel, K. G.; Pallon, J.; Carey, A. M. |
| 刊名 | NEW PHYTOLOGIST
 |
| 出版日期 | 2009 |
| 卷号 | 184期号:1页码:193-201 |
| 关键词 | Arsenic (As) Micronutrients Particle Induced X-ray Emission (Pixe) Rice Grain Synchrotron |
| 英文摘要 | Arsenic (As) contamination of rice grains and the generally low concentration of micronutrients in rice have been recognized as a major concern for human health. Here, we investigated the speciation and localization of As and the distribution of (micro) nutrients in rice grains because these are key factors controlling bioavailability of nutrients and contaminants. Bulk total and speciation analyses using high-pressure liquid chromatography (HPLC)-inductively coupled plasma mass spectrometry (ICP-MS) and X-ray absorption near-edge spectroscopy (XANES) was complemented by spatially resolved microspectroscopic techniques (mu-XANES, mu-X-ray fluorescence (mu-XRF) and particle induced X-ray emission (PIXE)) to investigate both speciation and distribution of As and localization of nutrients in situ. The distribution of As and micronutrients varied between the various parts of the grains (husk, bran and endosperm) and was characterized by element-specific distribution patterns. The speciation of As in bran and endosperm was dominated by As(III)-thiol complexes. The results indicate that the translocation from the maternal to filial tissues may be a bottleneck for As accumulation in the grain. Strong similarities between the distribution of iron (Fe), manganese (Mn) and phosphorus (P) and between zinc (Zn) and sulphur (S) may be indicative of complexation mechanisms in rice grains. |
| WOS记录号 | WOS:000269541600019 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/21799]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Meharg, A. A.,Zhu, Y. G.,Lombi, E.,et al. Speciation and distribution of arsenic and localization of nutrients in rice grains[J]. NEW PHYTOLOGIST,2009,184(1):193-201. |
| APA | Meharg, A. A.,Zhu, Y. G.,Lombi, E.,Scheckel, K. G.,Pallon, J.,&Carey, A. M..(2009).Speciation and distribution of arsenic and localization of nutrients in rice grains.NEW PHYTOLOGIST,184(1),193-201. |
| MLA | Meharg, A. A.,et al."Speciation and distribution of arsenic and localization of nutrients in rice grains".NEW PHYTOLOGIST 184.1(2009):193-201. |
入库方式： OAI收割
来源：生态环境研究中心
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