Chromatography as a Tool for Chemical Separation and Identification

Abstract

Chromatography is one of the most important analytical techniques for separating, identifying, and quantifying chemical components in complex mixtures. The technique is based on the differential distribution of compounds between a stationary phase and a mobile phase. Differences in polarity, adsorption, partitioning, molecular size, charge, or affinity cause compounds to travel at different rates, allowing them to be separated and subsequently detected. Major chromatographic methods include paper and thin-layer chromatography, gas chromatography, high-performance liquid chromatography, ion-exchange chromatography, size-exclusion chromatography, and affinity chromatography. This paper examines nine major dimensions of chromatography as a tool for chemical separation and identification, including fundamental principles, stationary and mobile phases, major techniques, detection, quantitative analysis, pharmaceutical and environmental applications, method development, and emerging developments.