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

详细信息    查看全文

• 作者：Nil Ozbek ; Suleyman Akman
• 关键词：High ; resolution continuum source graphite furnace atomic absorption spectrometer (HR ; CS GF AAS) ; Molecular absorption spectrometry (MAS) ; Fluorine determination ; Calcium monofluoride (CaF) ; Flour ; Slurry sampling
• 刊名：Food Analytical Methods
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：9
• 期：10
• 页码：2925-2932
• 全文大小：475 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Food Science
  Chemistry
  Microbiology
  Analytical Chemistry
  
• 出版者：Springer New York
• ISSN：1936-976X
• 卷排序：9

文摘

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.