The series of books prepared by a team of authors from St. Petersburg University contains the most important sections of modern analytical chemistry. This textbook is devoted to separation methods used in analytical chemistry and hybrid analysis methods created on their basis - methods in which separation methods and methods for determining separated substances are combined in one analytical procedure. Consideration of individual methods of separation and concentration of analytes is given to their general classification, and consideration of methods within individual groups allocated according to this classification begins with intra-group classifications, which makes it easy to navigate the whole variety of separation methods, see the relationship between them and approaches to choosing adequate solutions to various analytical problems.