Optimization and Application of a Slurry Sampling Method for the Determination of Total Fluorine in Flour Using a High-Resolution Continuum Source Graphite Furnace Molecular Absorption Spectrometer
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A slurry sampling method was described for the determination of total fluorine in flour via molecular absorption of calcium monofluoride (CaF) at 660.440 nm using a high-resolution continuum source graphite furnace atomic absorption spectrometer (HR-CS GF AAS). The slurries were prepared in 1 % Triton X-100, kept in an ultrasonic bath for 15 min, mixed in a shaker for 5 min (750 rpm), and then vortexed for 30 s shortly before sampling. The samples were mixed with 40 μg of Ca in the graphite furnace, pyrolyzed at 900 °C, and the absorbances for CaF were measured at 2200 °C. The LOD and characteristic mass of the method were 0.22 and 0.16 ng, respectively. The F concentrations of certified reference bush branches and leaves were determined in the uncertainty limits of the certified values. Finally, the F concentrations of different types of flours were determined applying the optimized conditions.
KeywordsHigh-resolution continuum source graphite furnace atomic absorption spectrometer (HR-CS GF AAS) Molecular absorption spectrometry (MAS) Fluorine determination Calcium monofluoride (CaF) Flour Slurry sampling
Compliance with Ethical Standards
This study was not funded by any agencies/institutes.
Conflict of Interest
Nil Ozbek declares that she has no conflict of interest.
Suleyman Akman declares that he has no conflict of interest.
For this type of study, formal consent is not required. This study does not contain any studies with human participants or animals performed by any of the authors.
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