GB/T 6730.64-2007 Determination of water-soluble chlorides in iron ore by Ion selective electrode method. The standard details the determination principle, stipulates the equipment and reagent materials, and gives the standard process from sample collection and processing to electrode calibrate and measurement operations, and also clarifies the calculation method of the results. With this standard, the water-soluble chlorides content in iron ore can be accurately determined, and the raw material mass can be controlled for steel production, helping to standardize iron ore testing and ensuring the performance and mass of steel products.