To achieve a better understanding of the “vinegar syndrome” phenomenon, which has caused serious damage to triacetyl cellulose-based motion picture films, the white powder obtained from damaged film surfaces was analysed in this study. The powder was found to be soluble in acetone, diethyl ether, dimethylformamide, and chloroform, but insoluble in water. From the results of ¹H, ¹³C and ³¹P nuclear magnetic resonance spectroscopy, mass spectrometry, and X-ray fluorescence measurements, it was concluded that the white precipitate had a molecular weight of 326 amu and was composed of triphenyl phosphate (C₁₈H₁₅O₄P).

中文翻译：

---

受损三乙酰纤维素基电影胶片表面形成的白色沉淀物的成分

为了更好地了解对三乙酰纤维素基电影胶片造成严重损坏的“醋综合症”现象，本研究对从损坏的胶片表面获得的白色粉末进行了分析。发现该粉末可溶于丙酮、乙醚、二甲基甲酰胺和氯仿，但不溶于水。从¹ H、¹³ C 和³¹ P 核磁共振波谱、质谱和 X 射线荧光测量的结果得出结论，白色沉淀的分子量为 326 amu，由磷酸三苯酯（C ₁₈ H ₁₅ O ₄ P)。