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D. Kolasa, В. Arndt, C. Jędras, К. Żorawska


Determination of copper by atomic absorption spectrometry in studying copper migration

from food-packaging plastic materials

Polimery 1999, No 9, 614


DOI: dx.doi.org/10.14314/polimery.1999.614


Summary

Conditions were established to determine by atomic absorption spectrometry (AAS) the trace amounts of copper that have migrated from foodstuff-packaging plastics to the Directive 85/572/EEC-recommended food simulants including distilled water, aqueous 3 % (w/v) acetic acid, aqueous 15 % (v/v) ethanol and sunflower oil. Used-up mineral-water PE bottles and PET and PVC edible-oil packages were used to study migration of Cu into the food simulants with or with no Cu-ion standard added to evaluate Cu recovery. In water as simulant, Cu was determined by flame atomic spectrometry. To calibrate the method, food simulants containing well-known Cu amounts were used. Tire sunflower simulant was mineralized prior to the determination. Two procedures were used to mineralize the oil, viz., dry ashing at 550 °C and wet oxidation with concentrated nitric and sulfuric acids as oxidant. In the sunflower oil, copper could be determined accurately (Table 4) only by the use of the latter method. The AAS determination of Cu in the mineralizate was affected by matrix effects; therefore, the standard addition method is recommended. Results (Tables 1-3, 5) show the migration of copper to the food simulants to remain always within the permissible level, viz., 30 mg/kg food simulant [2].


Keywords: atomic absorption spectrometry (AAS), migration of copper, contact of plastics with food, polyethylene, poly(vinyl chloride), poly(ethylene terephthalate)

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