Determination of the migration of dimethyl terephthalate and dimethyl isophthalate from plastics
Polimery 1999, No 3, 218
A gas chromatographic method is described for determining dimethyl terephthalate (DMT) and dimethyl isophthalate (DMIP) in food simulants. The method consists in extracting DMT and DMIP from food simulants with chloroform and analyzing for the compounds by GC by using calibration curves and diethyl terephthalate (DET) as internal standard. Hie sensitivity of the method was found to be 0.02 mg DMT and 0.02 mg DMIP per 1 kg food simulant. According to Directive 90/128/EEC, the specific migration limit for DMIP is 0.05 mg/kg. Statistical evaluation of the linear function is presented. The method developed was used to study migration of DMT and DMIP from PET bottles to distilled water, aqueous 10% (v/v) ethanol and aqueous 3% (m/v) acetic acid as food simulants. Neither DMT nor DMIP was found to migrate.
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