GB/T 7304-2000 in English

《GB/T 7304-2000石油产品和润滑剂酸值测定法 （电位滴定法）》由513（中国石油化工集团公司）归口，主管部门为中国石油化工集团公司。
本标准适用于测定能够溶解于甲苯和异丙醇混合溶剂的石油产品和润滑剂中的酸性组分。本标准可以显示油品在氧化条件下发生的与颜色和其他性能无关的相对变化。

Scope

This standard is applicable to the determination of acidic components in petroleum products and lubricants that can be dissolved in a mixed solvent of toluene and isopropanol. The dissociation constants of these acidic components in water should be greater than 10, very weak acids with dissociation constants less than 10 will not interfere, but the hydrolysis constants are greater than 10 salts will participate in the reaction. This standard can show the relative change of oil under oxidative conditions independent of color and other properties. Although the titration is carried out under specific conditions, this method cannot be used to determine the absolute acid value of the oil to predict the performance under service conditions. There is no necessary relationship between the acid value and bearing corrosion.