DETERMINATION OF SODIUM AND POTASSIUM IN FOOD
USING ATOMIC ABSORPTION SPECTROMETRY
1. SCOPE
The method is suitable for the determination of sodium and potassium in foodstuffs and some other
biological matrices. For sample preparation, various procedures can be applied; they include
microwave pressure decomposition with nitric acid, dry ashing followed by dissolution of ash in
diluted hydrochloric or nitric acid or sample solubilisation in diluted hydrochloric acid under slight
heating. To determine soluble sodium content (e.g. sodium chloride content) in food, a method of
sample extraction in pure water could be used.
The method was adapted from literature [1] and it is consistent with the standard method of ČSN
EN 1134 (56 0405) Fruit and vegetable juices – Determination of sodium, potassium, calcium and
magnesium content by atomic absorption spectrometry (AAS).
2. BASIC PRINCIPLE
The liquid sample is introduced into air-acetylene flame as aerosol using pneumatic nebulizer. Light
absorption caused by free atoms of sodium and potassium is measured at the specific spectral lines
of 589.0 nm and 766.5 nm, respectively. The samples and calibration solutions have to contain the
deionising agent of CsCl at the same concentration. The concentrations of elements are determined
from the corresponding values of absorbance using calibration curves.
DETERMINATION OF SODIUM AND POTASSIUM IN FOOD
USING ATOMIC ABSORPTION SPECTROMETRY
1. SCOPE
The method is suitable for the determination of sodium and potassium in foodstuffs and some other
biological matrices. For sample preparation, various procedures can be applied; they include
microwave pressure decomposition with nitric acid, dry ashing followed by dissolution of ash in
diluted hydrochloric or nitric acid or sample solubilisation in diluted hydrochloric acid under slight
heating. To determine soluble sodium content (e.g. sodium chloride content) in food, a method of
sample extraction in pure water could be used.
The method was adapted from literature [1] and it is consistent with the standard method of ČSN
EN 1134 (56 0405) Fruit and vegetable juices – Determination of sodium, potassium, calcium and
magnesium content by atomic absorption spectrometry (AAS).
2. BASIC PRINCIPLE
The liquid sample is introduced into air-acetylene flame as aerosol using pneumatic nebulizer. Light
absorption caused by free atoms of sodium and potassium is measured at the specific spectral lines
of 589.0 nm and 766.5 nm, respectively. The samples and calibration solutions have to contain the
deionising agent of CsCl at the same concentration. The concentrations of elements are determined
from the corresponding values of absorbance using calibration curves.
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