The work aims to study the relationship between the addition amount, residual amount, and migration amount of acetyl tributyl citrate (ATBC) in polyvinyl chloride (PVC) plastics by preparing positive samples so as to provide technical support for production enterprises to effectively control the safety risks of ATBC in PVC. To accurately test the residual amount of ATBC in PVC gaskets, a dissolution precipitation gas chromatography-mass spectrometry detection method was first established. After dissolving the sample in tetrahydrofuran, the large molecular compounds in the acetonitrile precipitation solution were added, and the clear solution was determined by GC-MS to obtain the residual amount of ATBC in PVC. Using literature review methods, the migration amount of ATBC in different food simulants in the sample was determined. Residual and migration tests were conducted on PVC plastic gaskets prepared by ourselves with 2%, 5%, 10%, 20%, 30%, 40%, and 50% ATBC added. The methodological validation of the newly established ATBC residue determination method showed a good linear relationship and correlation coefficient within the range of 0.20-5.0 mg/L, the correlation coefficient reached 0.998. The residue method detection limit was 5.0 mg/kg and quantification limit was 20 mg/kg, the spiked recovery rate was 95.6%-102%, and the relative standard deviation (n=6) was 3.7%-6.8%. The residue and migration test of positive samples processed by themselves showed that the residue and migration of ATBC were significantly positively correlated with the addition amount. When addition amount was at the same level, the migration level of ATBC in 4% acetic acid and 20% ethanol was low, while the migration level in olive and isooctane was high. When the addition amount of ATBC reached 30%, its migration risk in olive oil and isooctane approached the overstandard level, which needed to be concerned. When the addition amount reached 50%, the migration amount in olive oil and isooctane exceeded the limit requirement. This research will provide scientific data support for the scientific control of the addition amount of ATBC and the compliance control of the migration amount of ATBC in the production enterprises of PVC gaskets for caps.
Key words
polyvinyl chloride (PVC) /
acetyl tributyl citrate (ATBC) /
addition amount /
residue amount /
migration
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