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E. Kamińska, B. Rabiasz, A. Wiśniewska


Determination of barium and cobalt migrated from plastics

Polimery 1999, No 4, 288


DOI: dx.doi.org/10.14314/polimery.1999.288


Summary

Methods are described for determining barium and cobalt in food simulants, viz., distilled water, aqueous 10% (v/v) ethanol, aqueous 3% (w/v) acetic acid and sunflower oil. Flame atomic emission spectrometry was used to determine barium with no preconcentration applied and with potassium chloride added to suppress ionization of barium ions in the flame. Flame atomic absorption spectrometry was used to determine cobalt. To preconcentrate cobalt, cobalt ions were chelated with ammonium pyrrolidinecarbodithioate and the chelate was extracted with methyl isobutyl ketone. With sunflower oil containing barium and cobalt, samples were mineralized at 500°C, the ash was dissolved in hydrochloric acid and used to prepare a test solution. Tire sensitivity limits were found to be: 0.1 mg Ba/kg aqueous food simulant and 0.125 mg Ba/kg sunflower oil; 0.01 mg Co/kg aqueous food simulant and 0.0125 mg Co/kg sunflower oil. The methods were used to study migration of barium and cobalt from polyethylene film to food simulants (Table 2).


Keywords: migration of barium and cobalt from food plastics, flame atomic absorption spectrometry, flame atomic emission spectrometry

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