用滴定法和近红外光谱法测定酸值 (AN)
WP-053
zh
酸值 (AN) 是衡量机油质量及其腐蚀增强潜力的标准。在分析新的、未使用过的机油时，酸值用于确保生产商规定的质量，而对于使用过的机油，酸值是通过观察其增加情况来确定的，直到达到临界值。虽然人们通常认为 AN 值与机油的腐蚀潜力相关，但这并不完全正确，因为 AN 值的变化才是问题的关键所在。通过滴定法确定 AN 值的标准已经存在，但也可以通过光谱（近红外光谱）方法测量该参数。无论您选择哪种技术，瑞士万通都能为您提供适用于这些已发布标准的高性能仪器。
The acid number (AN) is an important parameter for assessing the quality and corrosiveness of oils. It indicates the amount of acidic compounds in the oil, which can degrade the oil’s performance and damage costly equipment. The AN can be measured by different methods, such as titration or near-infrared spectroscopy (NIRS). This White Paper presents the principles and advantages of both techniques, as well as the relevant standards and instruments from Metrohm. Ultimately, this provides an overview of the options and considerations for determining the AN of oils using titration or near-infrared spectroscopy (NIRS).