Download PDF by T. R. Crompton: Additive Migration from Plastics Into Food

By T. R. Crompton

ISBN-10: 0080224652

ISBN-13: 9780080224657

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Extra info for Additive Migration from Plastics Into Food

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Additive Migration from Plastics into Food 26 Procedure 5. (a) Carry out each extractability test and blank run in duplicate. Into five extraction tubes measure 200 ml. e. prepare twenty tubes). Ten of these will be used for plastic extraction tests and the other ten will serve as blank solutions: i) Distilled water ii) 50% aqueous ethanol iii) 5% sodium carbonate iv) 5% citric acid v) Olive oil containing 2% oleic acid or liquid paraffin. Plastics samples must be handled at all times using clean thin rubber gloves (to avoid grease contamination of the test specimens).

MJ 2 f - (MOj "(MtT* 45 46 Additive Migration from Plastics into Food (b) In the zone between the preceeding one (a) and the zone of complete extraction, (c) the relationship tends to become somewhat obscure. e. that the coefficients of distribution are the same. In practice, one tends to compensate for the difference between D ^ a n d D2 1 by simulating the phenomena of contact which occur over long periods of time in the presence of oil and fats by means of short period tests at low temperatures with very active solvents, even in this case, however, the observation that this procedures does not have any physical value still remains valid, yet it has been amply justified by the practical necessity of reducing the time and cost of control tests.

06 Comments Optical density at 378 nm due to Uvitex 0B is less than 3% of that optical density due to interference at 378 nm by all the other migrated polymer additives present. Uvitex cannot be determined under these conditions.

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Additive Migration from Plastics Into Food by T. R. Crompton

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