The main courses of chemistry major include inorganic chemistry, analytical chemistry, instrumental analysis, ICP-MS elemental analysis, organic chemistry, physical chemistry, structuring, chemical engineering foundation and so on. ICP-MS, full name of inductively coupled plasma mass spectrometer, can be used for qualitative, semi-quantitative and quantitative analysis of one or more elements in material samples, and can determine 90% of elements in the periodic table, especially metal elements. He, ICPOES and AAS are commonly used instruments in chemical element analysis.