Ivan Kempson - Localization and speciation of arsenic and trace elements in rice tissues

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      Publication Details (including relevant citation   information):

      E. Smith, IM   Kempson, A Juhasz, J Weber, WM Skinner, M Gräfe, Localization and   speciation of arsenic and trace elements in rice tissues.   Chemosphere, 76(4)529-535, 2009.


      The consumption of arsenic (As) contaminated rice is an important   exposure route for humans in countries where rice cultivation   employs As contaminated irrigation water. Arsenic toxicity and   mobility are a function of its chemical-speciation. The   distribution and identification of As in the rice plant are hence   necessary to determine the uptake, transformation and potential   risk posed by As contaminated rice. In this study we report on   the distribution and chemical-speciation of As in rice (Oryza   sativa Quest) by X-ray fluorescence (XRF) and X-ray absorption   near edge structure (XANES) measurements of rice plants grown in   As contaminated paddy water. Investigations of lXRF images from   rice tissues found that As was present in all rice tissues, and   its presence correlated with the presence of iron at the root   surface and copper in the rice leaf. X-ray absorption near edge   structure analysis of rice tissues identified that inorganic As   was the predominant form of As in all rice tissues studied, and   that arsenite became increasingly dominant in the aerial portion   of the rice plant.

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