Determination method of phenolic antioxidant

The invention relates to the technical field of lubricating oil, and discloses a determination method of a phenolic antioxidant. The method comprises the following steps: mixing a lubricant sample to be detected with an extraction reagent, and layering to obtain an upper-layer extracting solution; and mixing the upper-layer extracting solution with an extracting agent to obtain an extracting solution containing the phenolic antioxidant, and obtaining a gas chromatogram of the extracting solution. The method is low in detection limit, high in recovery rate, small in error and good in repeatability. 本发明涉及润滑油技术领域，公开了一种酚类抗氧剂的测定方法。该方法包括将待测润滑剂样品和提取试剂混合，分层后得到上层提取液；将上层提取液和萃取剂混合，得到含有酚类抗氧剂的萃取液，并获得萃取液的气相色谱图。该方法检出限低、回收率高、误差小、重复性好。