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Advisor(s)
Abstract(s)
Flow injection systems for the determination of sodium and potassium, by flame emission photometry,
and calcium and magnesium, by atomic absorption spectrometry, in beer are described. The samples
were directly injected in the flow system where automatic dilution occurred, and reagent addition
using the merging zones technique was performed. Lanthanum(III) consumption was reduced in
about 20-80-fold compared to conventional manual atomic absorption determinations. Sampling
rates of 120-200 determinations/h were achieved. The results were in agreement with the reference
procedures (relative deviations below 3.8%) and present good reproducibility (relative standard
deviations lower than 1.6% for 10 consecutive measurements).
Description
Keywords
Flow injection Beer Na K Ca Mg Flame emission Atomic absorption spectrometry
Pedagogical Context
Citation
FERNANDES, Sílvia M. V. ; RANGEL, António O. S. S. - Flow Injection Determination of Sodium, Potassium, Calcium, and Magnesium in Beer by Flame Emission and Atomic Absorption Spectrometry. Journal of Agricultural and Food Chemistry. ISSN 1520-5118. 45:4 (1997) 1269-1272
Publisher
American Chemical Society