Preparation of Reference Materials for Determination of Cadmium in Rice Grain by X-ray Fluorescence Spectrometry

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  • 蛍光X線分析用カドミウム含有粒状コメ標準物質の調製
  • ケイコウ Xセン ブンセキヨウ カドミウム ガンユウ リュウジョウ コメ ヒョウジュン ブッシツ ノ チョウセイ

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Abstract

A preparation method of Cd-containing rice grain was developed for X-ray fluorescence (XRF) analysis. Cd-containing rice grain was prepared by putting the base rice grain (white rice; Akita, Japan) into methanol containing an appropriate amount of Cd and then heating and cooling. The resulting rice grain was packed into a polyethylene cup (32 mm internal diameter × 23 mm height) covered with a 6-μm-thick polypropylene film for XRF analysis. In the XRF measurement of Cd Kα, Cd-containing rice grain had a sufficient durability, stability, and repeatability. The calibration curve of Cd constructed with a suite of Cd-containing rice grains showed good linearity (r = 0.996) in the range of 0.50–9.8 mg kg−1, whose concentrations of Cd were determined with atomic absorption spectrometry (AAS) using HNO3-H2SO4 decomposition after the XRF measurements. The lower limit of detection of Cd was 0.13 mg kg−1. The target concentrations of Cd in rice grains were in good agreement with the values obtained by AAS after acid decomposition.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 62 (10), 925-930, 2013

    The Japan Society for Analytical Chemistry

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