This standard specifies two methods for the determination of tungsten content in zirconium and zirconium alloys. The thiocyanate Spectrophotometric method, spectra-trophotometry is suitable for tungsten content in the range of 0.003% to 0.020%. The tungsten content is quantified by measuring the Absorbance of the colored complex formed with thiocyanate at 400 nm. The Inductance Coupled Plasma Atomic Emission Spectroscopy (AES) method is suitable for tungsten content in the range of 0.005% to 0.050%. The tungsten content is determined by atomic emission spectroscopy (AES). This standard applies to the analysis of tungsten content in sponge zirconium, zirconium and their alloys. To ensure accuracy, specific reagent and material requirements are provided.