Used in analytical chemistry for redox titrations, particularly in determining the concentration of oxidizing agents like potassium permanganate or potassium dichromate. Commonly applied in water and wastewater treatment testing to assess chemical oxygen demand (COD). Also utilized in the pharmaceutical industry for quality control of iron-related formulations. Suitable as a reducing agent in calibration of instruments and standardization of other reagents. Its precise concentration makes it ideal for laboratory use in environmental, industrial, and research settings where accurate iron quantification is required.