期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 69, 期 12, 页码 1824-1829出版社
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.69.1824
关键词
XRF spectroscopy; Heavy metal; Phytoremediation
资金
- National Research Foundation of Korea (NRF) - Korea government(Ministry of Science, ICT and Future Planning) [2008-0061991]
The uptake of heavy metals by plants has been receiving much attention for crop contamination and phytoremediation. We employed synchrotron X-ray fluorescence (XRF) spectroscopy for an in-vivo analysis of heavy-metal uptake through a strand of maize root. A focused X-ray beam of 2.5 x 2.5 mu m(2) in physical dimensions was scanned along horizontal lines of the maize root at intervals of 3 mu m at the 4B X-ray micro-diffraction beamline of the Pohang Accelerator Laboratory (PAL). Time-resolved mapping of the fluorescence intensities from multiple metallic elements in the root tissues provided information about the radial distributions of heavy-metal elements and their temporal variations. The concentrated core stream of heavy-metal elements spread radially up to roughly 500 mu m, corresponding to 40 % of the root diameter. The absorption characteristics of three heavy metals, Cr, Mn and Ni, and their physiological features were analyzed. The absolute concentrations and the contents of the heavy-metal elements in the tested maize roots were quantitatively evaluated by using the calibration curve obtained from reference samples with preset concentrations. The uptake quantities of the tested heavy-metal elements are noticeably different, although their molecular weights are similar. This study should be helpful for understanding plant physiology related with heavy-metal uptake.
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