GB/T 25963-2010 Introduces the determination of aromatic hydrocarbons in the intermediate fraction containing fatty acid methyl esters by differential refractive light Detector High performance liquid chroma-tography, HPLC. The standard clarifies the separation of aromatic hydrocarbons based on high performance liquid chromatograph and the principle of differential refractive light Detector detection. Specify the performance indicators of High Performance Liquid Chromatograph and differential refractive light Detector, and explain the sample collection, processing and injection flow in detail. Specify chromatograph conditions, such as Mobile phase carrier gas composition, Flow velocity, etc. With the help of this standard, the aromatic content in the relevant intermediate fractions can be accurately determined, providing key data support for oil mass control, production process optimization and related Product Research & Development, and assisting industry standardization testing.