This standard specifies the determination method of lead and copper content in tin dioxide, and the determination range is 0.0050% to 0.060% for lead and 0.00050% to 0.020% for copper, respectively. After the sample is analyzed by aqua regia, the content of lead and copper is determined by Flame Atomic Absorption Spectrometer (FAAS) in 10% aqua regia medium. The standard details the preparation of the required reagents, the use of instruments and equipment, and the analysis steps, providing operating specifications for the accurate determination of lead and copper content in tin dioxide.