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

• Published in: Spectrochimica acta. Part B: Atomic spectroscopy 2018-02, Vol.140, p.73-75
• Main Authors: Tinas, Hande, Ozbek, Nil, Akman, Suleyman
• Format: Article
• Language: English
• Subjects: Absorption; Absorption spectroscopy; Atomic absorption analysis; Atomizing; Calibration; Detection; Flour; Graphite; High resolution; High-resolution continuum source graphite furnace atomic absorption spectrometry; Homogeneity; Lead; Platforms; Pyrolysis; Reference materials; Resolution; Risk assessment; Sampling; Solid sampling; Solutes; Spectral analysis; Spectrometry; Tubes; Zirconium
• ISSN: 0584-8547; 1873-3565
• DOI: 10.1016/j.sab.2017.12.002

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°C and 2200°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 7.2pg and 9.0pg of lead, respectively. The lead concentrations in different types of flour samples were found in the range of 25–52μgkg−1. Finally, homogeneity factors representing the heterogeneity of analyte distribution for lead in flour samples were determined. [Display omitted] •Lead concentrations in flour samples were directly determined without digesting.•Micro-scale distributions of lead in flour samples were determined.•The analytical line at 283.306nm using HR-CS GF AAS.•Pd was used as modifier while graphite furnace were coated with Zr.