Determination of Arsenic, Lead and Selenium in Rice Flour by Graphite Furnace Atomic Absorption Spectrometry

흑연로원자흡수분광법에 의한 쌀분말시료중의 비소, 납, 셀레늄의 정량

  • Cho, Kyung-Haeng (Division of Chemistry and Radiation, Korea Research Institute of Standards and Science) ;
  • Suh, Jung-Ki (Division of Chemistry and Radiation, Korea Research Institute of Standards and Science)
  • 조경행 (한국표준과학연구원 화학방사선연구부) ;
  • 서정기 (한국표준과학연구원 화학방사선연구부)
  • Received : 1998.10.28
  • Published : 1999.04.25


A graphite furnace atomic absorption spectrometry (GFAAS) with matrix modification has been used to determine trace amounts of arsenic, lead and selenium in rice flour samples. A mixed solution of palladium and magnesium nitrate was used as a matrix modifier to convert the analyte elements into a phase of higher thermostability and to increase the volatility of concomitants in graphite furnace. Matrix modification effects by the mixed solution were investigated for several elements (As, Cd, Cu, Pb, Se, Zn). It has been found that the matrix modifier substantially increase the pyrolysis and atomization temperature, and absorbance for As, Pb and Se. The concentration of As, Pb and Se in rice flour samples were determined by standard addition method with Zeeman background correction after microwave acid digestion. In this method the characteristic concentrations of As, Pb and Se are 26 ng/g, 18 ng/g, 24 ng/g on the basis of dry sample respectively.


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