This standard describes the method for the determination of water-soluble chlorides in iron ore using the potentiometric Titrimetric method and specifies a mass fraction with an applicable range of 0.005% to 0.35%. The standard refers to a series of normative documents, including chemical reagent standard preparation, iron ore sampling method, Precision of Measuring method, etc. The method summary includes that the sample is leached in water and dried filtrated, sulfide interference is eliminated under alkaline conditions, nitric acid acidification solution is added, and finally the chlorides content in the test solution is determined using the potentiometric Titrimetric method. The reagents section details the requirements and preparation methods for various reagents such as water, potassium chloride, silver nitrate (AgNO3), etc.