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High-Performance Liquid Chromatography (HPLC) is an advanced analytical technique widely used in environmental chemistry for the separation, identification, and quantification of complex mixtures of compounds in environmental samples such as water, soil, and air. HPLC is a refinement of classical liquid chromatography, offering higher resolution, faster analysis, and improved sensitivity, making it indispensable for detecting pollutants, toxins, and other trace-level contaminants in the environment. The fundamental principle of HPLC is based on the differential partitioning of compounds between a stationary phase and a mobile phase. The stationary phase is a solid or semi-solid material, often packed into a column, while the mobile phase is a liquid that flows through the column under high pressure. Separation occurs because different components of a mixture have distinct interactions with the stationary phase and solubility in the mobile phase. Compounds with stronger interactions with the stationary phase move more slowly through the column, whereas compounds with weaker interactions elute faster. The elution time, known as the retention time, is characteristic for _________ _________ ______ ____ ________ _________ ___ ___.
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