This standard specifies the determination method of magnetic foreign matter and residual alkali content in lithium ion battery anode materials. It is suitable for evaluating the content of magnetic foreign matter (measurement range ≥ 1 µg/kg) and residual alkali (mass fraction range 0.001%~ 2.500%) in lithium ion battery anode materials. The standard describes the definition and classification of magnetic foreign matter in detail, including large particle magnetic foreign matter, and specifies the detection requirements of residual alkali. The standard refers to the relevant chemical reagent prepative, laboratory water specification and numerical revision specification documents to ensure the accuracy and Reliability of test results.