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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Preparation and Certification of Rice Flour Reference Materials for Trace Elements Analysis

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.4, pp.271-280
Cho, Kyung-Haeng
Park, Chang-Joon
Woo, Jin-Choon
Suh, Jung-Ki
Han, Myung-Sub
Lee, Jong-Hae
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Abstract

Rice flour reference materials were prepared from the unpolished rice grown in Korea and certified for elemental composition. The reference materials consist of two samples containing normal and high level. The reference material at elevated level was prepared by spiking to the normal rice flour six toxic elements of As, Cd, Cu, Cr, Hg, Pb with <TEX>$1.0{\mu}g/g$</TEX> on a dry weight basis. Homogeneity of the prepared materials was evaluated through the determination of Ca, Cu, Fe, Mn, Zn by instrumental neutron activation analysis (INAA) and atomic absorption spectrometry (AAS). Small variance of elemental composition among interbottled samples assured homogeneity of the prepared materials. The materials were decomposed by high pressure digestion and microwave digestion method. INAA, AAS, inductively coupled plasma-atomic absorption spectrometry (ICP-AES), ICP-mass spectrometry (MS) and vapour generation techniques were employed to analyze the reference materials. From this independent analytical results, the certified or reference values are determined for As, Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Mn, Mo, Na, P, Pb, Se, Zn.

keywords
rice flour reference material, homogeneity test, NAA, AAS, ICP-AES, ICP-MS, vapour generation techniques


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