Determination of lead in flour samples directly by solid sampling high resolution continuum source graphite furnace atomic absorption spectrometry


Tınas H. , Özbek N. , Akman S.

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, cilt.140, ss.73-75, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 140
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.sab.2017.12.002
  • Dergi Adı: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
  • Sayfa Sayıları: ss.73-75

Özet

In this study, lead concentrations in various flour samples were determined by high-resolution continuum source graphite furnace atomic absorption spectrometry with solid sampling. Since samples were analyzed directly, the risks and disadvantages of sample digestion were eliminated. Solid flour samples were dried, weighed on the platforms, Pd was added as a modifier and introduced directly into a graphite tube using a manual solid sampler. Platforms and tubes were coated with Zr. The optimized pyrolysis and atomization temperatures were 800 degrees C and 2200 degrees C, respectively. The sensitivities of lead in various flour certified reference materials (CRMs) and aqueous standards were not significantly different. Therefore, aqueous standards were safely used for calibration. The absolute limit of detection and characteristic mass were 7.2 pg and 9.0 pg of lead, respectively. The lead concentrations in different types of flour samples were found in the range of 25-52 mu g kg(-1). Finally, homogeneity factors representing the heterogeneity of analyte distribution for lead in flour samples were determined. (C) 2017 Elsevier B.V. All rights reserved.