This standard specifies a method for the determination of zinc content in tin concentrates by flame atomic absorption spectroscopy (AAS), which is suitable for the determination of zinc content in samples with a zinc content in the range of 0.005% to 3.50%. Absorbance measurement of zinc in muriatic acid medium by muriatic acid and nitric acid analysis of samples, and finally calculation of zinc content according to the standard Linear dispersion method. This standard describes in detail the requirements of reagents, the specifications of instruments and the operation procedures, providing a technical basis for the accurate determination of zinc content in tin concentrates.