A Gas Chromatograph Mass Spectrometer (GC-MS) is a powerful analytical instrument used in chemistry and biochemistry for separating, identifying, and quantifying components of complex mixtures.GC-MS is widely used in various fields such as environmental analysis, pharmaceuticals, forensics, and food analysis due to its high sensitivity, selectivity, and ability to analyze complex mixtures. It's an indispensable tool for chemists and researchers in understanding the composition of substances.Desorption for solids is carried out with a flow rate of 1 to 1.5 ml/min at a regulated temperature between 100 and 350℃.