GB/T 14571.4-2008 is the standard for the determination of industrial ethylene glycol ultraviolet light transmitance. Using Ultraviolet spectrophotometry, first explain the principle, that is, measure the ultraviolet light transmission according to the absorption characteristics of ethylene glycol. Specify the parameters of ultraviolet spectrophotometer and other equipment, describe the sample preparation process from sampling to processing, and clarify the measurement and data processing steps. This standard provides a unified method for the accurate determination of industrial ethylene glycol ultraviolet light transmitance, helping to control the Optical inspection mass of products and ensure their applicability in relevant application scenarios.