This standard applies to the determination of copper content in silver. Measurement range is 0.0005% to 0.060%. The method is to separate the silver by dissolving the sample in nitric acid, generating silver chloride settling with muriatic acid, and finally using flame atomic absorption spectroscopy (AAS) to measure the Absorbance of copper at 324.8 nm wavelength. The standard provides specific reagent preparation, instrument parameters and operation procedures to ensure the accuracy and Reliability of measurement, providing a scientific basis for the detection of trace copper in high purity silver.