"Determination of 1-Methyl-2-pyrrolidone in Coatings, High Performance Liquid Chromatography-Tandem Mass Spectrometry" in SN/T 4768-2017 specifies the specific operation steps for the determination of 1-Methyl-2-pyrrolidone in Coatings using the LC-MS/MS method. This standard applies to aqueous and solvent-based paints samples and covers the key steps of sample pretreatment, solvent selection, mixture separation and LC-MS/MS analysis. The sample is extracted and cleaned by treatment of aqueous acetonitrile solution or ethyl acetate, and finally detected and quantified by LC-MS/MS technology. The standard describes the experimental operation in detail, including the requirements for the use of reagents, the operating procedures and the technical specifications of the analytical instrument, ensuring the accuracy and Reliability of the analysis.