GB/T 15076.5-2017 "Methods for chemical analysis of tantalum and niobium, Part 5: Determination of molybdenum and tungsten content Inductance coupled plasma atomic emission spectroscopy (AES) method" stipulates the method for the determination of molybdenum and tungsten content in tantalum, niobium and their compounds by Inductance coupled plasma atomic emission spectroscopy (AES) method (ICP-OES). The standard applies to the determination of molybdenum and tungsten content in tantalum, niobium and its hydroxides, oxides, carbide and potassium fluorotantalate, with a measurement range of 0.0005% to 3.00%. The standard provides important technical guidance for the accurate analysis of molybdenum and tungsten content in tantalum and niobium materials.