GB/T 1 2688.5 - 2011 Part 5 The Titrimetric method is used to determine the total aldehyde content in industrial styrene. It is suitable for all kinds of industrial styrene products. First, the styrene sample is mixed with a reagent that can react with aldehyde, and then the reaction residue is titrated with a titrant, and the total aldehyde content is calculated according to the amount of titrant. The standard specifies the specifications of Burette and other instruments, and specifies the preparation method of relevant reagents. Detailed description of Sample Handling steps, such as sample measurement and reaction condition control. Standardize the titration operation process, including titration speed and end point judgment method. According to this standard, the total aldehyde content can be accurately determined, providing key data for industrial styrene quality control and related production process optimization.