Abstract
This chapter discusses stationary phases in extraction chromatography and describes their performance characteristics and effects upon the overall behavior of chromatographic columns. The chapter presents a systematic survey of the different compounds used in column chromatography and outlines their extraction behavior. The main performance characteristics of an extraction-chromatographic stationary phase may be collected within retention, selectivity, and physical stability. The chapter also presents a systematic survey of the extractants used as stationary phases, such as acidic extracts. Acidic extractants are organic compounds that have acid groups in their molecules. They are often called “liquid cation exchangers” because their behavior can be easily related to that exhibited by cation-exchange resins.
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