Measurement of optimal flow rate in gradient elution liquid chromatography

Advances in the Application of Liquid Chromatography in the Detection of Pollutants

Food is easy to be contaminated because of its complex composition. Therefore, in order to protect people from potential food contaminants, it is very necessary to test for various contaminants in food. Liquid chromatography is widely used in the field of food safety detection. In addition, with the development of liquid chromatography technology, more and more new instruments are combined with liquid chromatography. Compared with traditional liquid chromatography, combined liquid chromatography has great advantages in efficiency and operation. Therefore, it is rapidly promoted in the field of food safety testing. In this paper, the results of the determination of three kinds of food pollutants by different liquid chromatography methods are reviewed, and the indexes are compared and analyzed.

Column length is a structure-independent measure of solvent consumption in liquid chromatography

Column length (L) is a measure of solvent consumption in LC analysis. In its latter role, L is the specific solvent consumption - the void time (t_M) solvent consumption per unit of the column flow-area (A_F) which is the cross-sectional area of the column open space (external and internal pores). In t_anal-long LC analysis (isocratic or gradient), the solvent consumption (V_S) is V_S = A_FLt_anal /t_M regardless of flow rate (F) as long as all changes in column dimensions and operational parameters are translatable (in gradient analysis, the ratio of the gradient time (t_G) to t_M remains fixed).