This standard specifies a method for the determination of tin content in titanium alloys by flame atomic absorption spectroscopy (AAS), suitable for samples with a tin content in the range of 1.00% to 5.00%. Methods The sample is dissolved by muriatic acid-Boricacid and the measurement of tin Absorbance at a specified wavelength after titanium oxidation. The standard describes in detail the required reagents, instruments and operation procedures, providing a reliable basis for the accurate determination of tin content in titanium alloys.