This standard applies to the determination of iron content in silver, and the determination range is 0.0005% to 0.010%. Methods The sample is dissolved by sulfuric acid, and the iron hydroxide is enriched in an ammonia solution. After separation from silver, the flame atomic absorption spectroscopy (AAS) method is used to measure the iron Absorbance at a wavelength of 271.9 nm. The standard describes in detail the reagent preparation, analysis procedures and instrument conditions to ensure the accuracy and conformity of the test. It is an important reference standard for the detection of trace iron content in silver.