This standard specifies a method for determining the total hydrogen content in carbon black, with its core focus on using the thermal conductivity detector (TCD) method to measure the total hydrogen content released from samples under specific high-temperature conditions. It is specifically applicable to the quality control and analysis of carbon black used in rubber. The standard details the complete procedure for determination using a hydrogen analyzer equipped with a TCD detector and sets clear requirements for key reagents and consumables, such as high-purity argon and nickel capsules. Through high-temperature fusion extraction and gas analysis of the samples, this method enables accurate determination of the hydrogen content in carbon black, providing critical technical support for evaluating the surface activity of carbon black and its reinforcing performance in rubber products.