This standard specifies a method for the determination of barium content in industrial wastewater by the potential Titrimetric method, which is suitable for wastewater detection in the chemical industry, machinery manufacturing and pigment industries. The detection range is 47.1 to 1,180 µg, and the minimum detection limit is 28 µg. Barium ions react with sodium tetraphenylborate to form settling, and the titration endpoint is determined by the potential Titrimetric method. This method has certain requirements for the interference of strontium and calcium plasma. This standard provides a reliable method for the determination of barium content, which is suitable for the monitoring and control of barium concentration in wastewater from related industries.