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Speciation and distribution of arsenic and localization of nutrients in rice grains

Lombi, E.; Scheckel, K. G.; Pallon, Jan LU ; Carey, A. M.; Zhu, Y. G. and Meharg, A. A. (2009) In New Phytologist 184(1). p.193-201
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
particle induced X-ray emission (PIXE), arsenic (As), micronutrients, rice grain, synchrotron
in
New Phytologist
volume
184
issue
1
pages
193 - 201
publisher
Wiley-Blackwell
external identifiers
  • wos:000269541600019
  • scopus:68049116620
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2009.02912.x
language
English
LU publication?
yes
id
faff017f-d8d3-4365-afc3-d571b6849890 (old id 1474995)
date added to LUP
2009-10-02 11:45:34
date last changed
2017-12-10 03:39:21
@article{faff017f-d8d3-4365-afc3-d571b6849890,
  abstract     = {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.},
  author       = {Lombi, E. and Scheckel, K. G. and Pallon, Jan and Carey, A. M. and Zhu, Y. G. and Meharg, A. A.},
  issn         = {1469-8137},
  keyword      = {particle induced X-ray emission (PIXE),arsenic (As),micronutrients,rice grain,synchrotron},
  language     = {eng},
  number       = {1},
  pages        = {193--201},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Speciation and distribution of arsenic and localization of nutrients in rice grains},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2009.02912.x},
  volume       = {184},
  year         = {2009},
}