特种液压油添加剂的GC-MS定量分析

Quantitative Determination of Mass Ratio of Additives in Special Super High Pressure Hydraulic Oil

采用选择离子监测（ＳＩＭ）模式作为气相色谱／质谱法（ＧＣ／ＭＳ）检测方式测定了某超高压液压油中两种添加剂２，６－二叔丁基对甲酚的质量比和磷酸三苯酯的质量比。测得的校正因子Ｆ值和添加剂质量比均有较高的精确度。还对ＳＩＭ 模式中有关离子的选择作了简单的探讨。

Two additives, phenol, 2,6 bis(1,1 dimethylethyl) 4 methyl and triphenyl phosphate with mass ratio of less than one thousandth in special super high pressure hydraulic oil were determined by GC MS. Tributyl phosphate ester was used as internal standard. The correction factor of each additive was determined before analysis. Each sample was analysed for 5 times to get good precision. It is satisfactory to use SIM as the detecting mode, and the CV S of correction factors and mass ratio were about 5%. The problems of how to select the monitoring ion in SIM mode and the sample size required are discussed in this paper. This method is satisfactory in analyzing low mass ratio constituents in a mixture.