Phosphate buffer solution with pH 5.8 (conforms to 2020 CP, 8004 general rules). Used to maintain a stable pH in biological and chemical experiments. Commonly applied in cell culture, protein purification, and enzyme reactions where pH control is critical. Ideal for diluting substances in immunoassays and maintaining sample integrity during analysis. Also used in pharmaceutical formulations and diagnostic reagents to ensure optimal activity and stability. Compatible with many biological systems, making it a standard choice in laboratories and industrial processes.