GB/T 16477.3-2010 standard specifies the determination method of oxidation mg content in rare earth ferrosilicon alloys and rare earth mg ferrosilicon alloys. This method is suitable for the determination of oxidation mg content in samples ranging from 0.30% to 3.00%. During the determination process, the sample is first leached and separated using potassium dichromate solution, and then in dilute muriatic acid medium, the oxidation mg content is determined at a wavelength of 280.270 nm by Inductance Coupled Plasma Emission Light Spectrometry (ICP-AES). The standard details the preparation method of the reagent and the instrument requirements to ensure the accuracy and Reliability of the measurement.