1. Used for bleaching cotton fabrics and organic materials; 2. Used as a reducing agent in the dye, papermaking, leather, and chemical synthesis industries; 3. Used in the pharmaceutical industry as an intermediate in the production of analgin and aminopyrine; 4. Food-grade products are used as bleaching agents, preservatives, and antioxidants; 5. Used in the treatment of chromium-containing wastewater and as an electroplating additive.