"SN/T 2251-2009 Determination of benzene, toluene, Xylene and toluene diisocyanates in solar-based paints, headspace GC-MS method" specifies the use of top air phase chromatograph Mass spectrometry (GC-MS) to determine the content of benzene, toluene, Xylene and toluene diisocyanates in solar-based paints. This standard applies to the determination of benzene, toluene, Xylene and toluene diisocyanates in solar-based paints. After the sample is dissolved in ethyl acetate, it is qualitatively and quantitatively analyzed by headspace sampling using GC-MS technology, and the Internal standafard method is used to ensure the accuracy of the determination results. The method specifically describes the steps of Sample Handling, Instrument Operation and Data Analysis, providing reliable methods and technical support for the monitoring of hazardous substances in the Coatings industry.