This standard specifies a method for the determination of zinc content in tungsten concentrates by flame atomic absorption spectroscopy (AAS) for samples with a zinc content in the range of 0.005% to 0.50%. Zinc content is calculated by acidolysis of samples using an air-acetylene flame to measure zinc Absorbance at specific wavelengths. The standard provides detailed reagent formulation, Sample Handling and measurement process to ensure the accuracy and repeability of the measurement results.