This standard provides methods for the determination of calcium, mg, copper, lead, zinc, nickel, manganese, cadmium, aluminum, iron and sulfate content in lithium carbonic acid, lithium hydroxide monohydrate and lithium chloride. Inductance coupled plasma atomic emission spectroscopy (AES) method (ICP-AES) is used to achieve high-precision detection by matrix matching standard Linear dispersion method. It is suitable for analyzing the elemental content in these chemicals to ensure that the product mass meets the relevant standards. The standard also contains the necessary normative reference documents and term definitions to guarantee the accuracy and conformity of the analysis process.