Explanation
A method of ionizing the sample to be tested, separating and detecting ions according to mass to charge ratio, and analyzing the substance. By separating and recording ions with different mass to charge ratios and their different trajectories in electric or magnetic fields, mass spectrometry can be obtained to analyze the composition or structure of the sample. The mass spectrometer used typically consists of an injection system, ion source, analyzer, receiver, and recorder, as well as corresponding vacuum and electronic systems. The sample is introduced by the injection system. In the ion source, sample molecules or atoms are ionized into ions, separated by a mass analyzer composed of an electric or magnetic field, and then detected and recorded to obtain a mass spectrum. In the mass spectrum, each peak represents an ion with a specific charge ratio, and the intensity of the peak represents the number of such ions. Therefore, qualitative and quantitative analysis can be conducted. For organic compounds, structural analysis can also be performed based on the mass charge ratio and relative intensity of the mass spectrum peaks. mass spectrometry is widely used in nuclear industry, geology, metallurgy, pharmaceutical composition identification, petrochemical industry, environmental protection, doping detection, space exploration and other fields. According to the scope of application, it can be divided into three categories: isotope, inorganic, and organic analysis. Gas, liquid, and the same three state samples can all be analyzed using different types of mass spectrometers. Its advantages are high sensitivity, low sample usage, simultaneous detection of multiple components, and the ability to obtain isotope information. The disadvantage is that the instrument structure is complex and expensive.
Classification
Fundamental of Material Science -> Analysis and testing technology of materials