GB/T 26603-2011 "N,N-Dimethylaniline" specifies the quality requirements, test methods, inspection rules, and other relevant content for this product. It is applicable for quality control of the product, which is classified into two grades: premium grade and qualified grade. The standard covers key indicators such as appearance, crystallization point of the dry product, purity, organic impurity content, and moisture content. The purity is determined using capillary column gas chromatography, which requires a gas chromatograph equipped with a hydrogen flame ionization detector (FID), a dedicated capillary chromatographic column, and a chromatography workstation. Quantification is performed using the peak area normalization method, providing standardized technical basis for quality control of this chemical intermediate.