Cobalt release of oxygen scavenger added multilayered PET bottles in various domestic solvents

Abstract

Cobalt catalyzed oxygen scavenger added multilayered PET bottles were inspected in our work. X-ray fluorescent spectrometry (XRF) technique was used to select the investigated bottles. Inductive coupled plasma mass spectrometry (ICP-MS) was applied to determine the cobalt content of different domestic solvents after extraction. Extraction experiments were separated into 48 hour extractions, Lakanen-Erviö extraction, and extraction kinetic experiments. The fruit brandy and the orange juice contained in the bottles were the two most successful agents dissolving cobalt without chemical reactions. 1 M NaOH was the agent dissolving the highest quantity of cobalt as a consequence of the hydrolysis of PET. Continuous cobalt dissolving over time could be experienced when NaOH agent penetrated into the grains of flakes. Reuse of active multilayered bottles for domestic solvents did not show harmful cobalt concentration, but the ground and oxygen scavenger added multilayered PET bottles showed cobalt concentration over the limit value.