GB/T 21896-2008 regulates 2-naphthylamine-1,5-disulfonic acid (sulfonated turnip acid). It specifies the technical requirements of the product, covering indicators such as Appearance, purity and content. Detailed sampling and inspection rules to ensure the conformity and Stability of product mass. Specify corresponding test methods, such as purity determination procedures. This standard provides a unified basis for the production, inspection and use of 2-naphthylamine-1,5-disulfonic acid, guarantees product mass, meets the needs of dyestuff, pharmaceutical and other industries for the chemical raw materials, and promotes the development of relevant industries.