Studies of low contents of mineral components in PET films
The gravimetric, spectrophotometry and ASA methods have been used for the analytical determination of the content of (Zn (II)-, Al (III)-, Sb (III)-, Ti (IV)-, Mn (II)-, Ge (IV)-, Si (IV)-, (as SiO2), and Ca (Il)-ions in PET films of Polish manufacture designed for various end-uses. a.o. for the manufacture of packaglngs for food products. Methods for mineralization of samples and for the determination of the individual elements have been elaborated. The results of determinations for five types of films revealed an alarmingly high content of metals. In particular of Sb.
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