This standard specifies a method for the determination of cadmium content in zinc concentrates using flame atomic absorption spectroscopy (AAS). It is suitable for zinc concentrate samples with cadmium content ranging from 0.10% to 2.00%. During the determination, the sample is first dissolved with muriatic acid and nitric acid, and then in dilute nitric acid medium, the Absorption of cadmium is measured by atomicAbsorption Spectroscopy at a wavelength of 228.8 nm by air-acetylene flame. The standard requires the use of analytical pure reagents and high-purity water to ensure the accuracy of the measurement. The standard also includes the preparation of cadmium standard storage solutions and standard solutions.