Model and specification: 1260 of Agilent company. The liquid chromatograph is an instrument that uses the difference of the distribution ratio of the mixture between liquid-solid or immiscible two liquids to separate the mixture first, and then analyze and identify it.It is widely used in biochemistry, food analysis, pharmaceutical research, environmental analysis, inorganic analysis and other fields.It is mainly used to detect the content and impurities of raw and auxiliary materials.