Experiments using this document require practical experience in formal laboratory work and may involve certain hazardous materials, equipment and operations. Therefore, it is the responsibility of the user to take appropriate safety and health measures to ensure compliance with relevant national regulations. This document describes the test method for the determination of aromatic hydrocarbons in intermediate fractions using Differential Refractive Light Detector High performance liquid chroma-tography, HPLC. It is suitable for the determination of aromatic hydrocarbons in diesel and petroleum fractions. It contains two steps and is suitable for samples containing different volume fractions of fatty acid methyl esters. At the same time, terms and definitions are given, as well as normative reference documents.