China Plastics ›› 2025, Vol. 39 ›› Issue (1): 80-84.DOI: 10.19491/j.issn.1001-9278.2025.01.013

• Standard and Test • Previous Articles     Next Articles

Study on simultaneous determination of IPA, EG, and DEG contents in drinking water bottles by gas chromatography

YE Linquan(), QIAN Taotao, LI Rongbing, ZENG Le   

  1. China Resources Chemical Innovative Materials Co,Ltd,Changzhou 213033,China
  • Received:2024-04-12 Online:2025-01-26 Published:2025-02-14

Abstract:

In this study, a gas chromatographic method was established for the determination of the contents of terephthalic acid (IPA), ethylene glycol (EG) and diethylene glycol (DEG) in polyethylene terephthalate (PET) bottle slices. The optimized and validated method was employed to test the contents of IPA, EG, and DEG in drinking water bottles after. The results indicated that the DEG contents in 16 types of drinking water bottles from 11 different brands was in the range from 1.15 % to 1.44 % with a mean of 1.30 % and a RSD of 7.5 %. The contents of EG are distributed between 30.28% and 32.67 % along with a mean of 32.0 % and a RSD of 2.0 %. The proportion of DEG to EG means was around 4 %. The content of IPA showed a relatively large difference ranging from 0.68 % to 2.3 % along with a common value of 2.03 %±0.35 %.

Key words: gas chromatography, terephthalic acid, ethylene glycol, diethylene glycol, drinking water bottles

CLC Number: