Laboratory experiment demonstrates internal standards calibration for sodium analysis in food using flame emission spectrometry.
A laboratory experiment describing the use of flame emission spectrometry using a CCD array spectrometer equipped with a fiber optic probe is described. A sample of Group I ions is nebulized using a chromatographic sprayer into the air intake of a Bunsen burner flame, thus a commercial nebulizer and atomic emission spectrometer is not required. The experiment demonstrates the utility of an internal standards calibration procedure in this very real case where sample introduction is not constant. Calibrations are provided for Na, K, Rb, and Cs using a Li internal standard. Students analyze for sodium by preparing a series of standard solutions with a constant Li internal standard concentration, then use the resulting regression line to quantitatively analyze a provided unknown solution for Na content. Students also analyze a salty food for Na content to compare with the nutritional information provided on the package.
No takes yet. Share an insight, caveat, or question.
Blitz et al. (2009) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: