GB/T 24164-2020 "Determination of Chlorobenzenes in Dye Products" is applicable to the determination of chlorobenzene compounds in dye products, using a gas chromatograph (equipped with an electron capture detector) or gas chromatography-mass spectrometry. The sample is ultrasonically extracted with dichloromethane, and the extract is centrifuged, concentrated, and then injected for analysis, with quantification performed by the external standard method. The standard specifies the type of chromatographic column, carrier gas flow rate, and detection conditions, covering various chlorobenzenes such as 1,2-dichlorobenzene and 1,4-dichlorobenzene. The method detection limit is 0.5 mg/kg, and it clearly outlines requirements for sample pretreatment and data calculation.