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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 chemical components in complex mixtures. The principle of HPLC is based on the differential partitioning of compounds between a mobile phase and a stationary phase. The mobile phase is a liquid solvent or a mixture of solvents that flows through a column packed with a solid stationary phase under high pressure. Compounds in the sample interact differently with the stationary phase based on their chemical properties, such as polarity, hydrophobicity, or molecular size, causing them to elute from the column at different times. The time taken by a compound to pass through the column, known as its retention time, is characteristic and can be used for qualitative identification. Quantitative analysis is achieved by measuring the detector response, which is proportional to the concentration of the analyte in the sample. The instrumentation of HPLC consists of several key components. The first essential part is the solvent reservoir, which holds the mobile phase. Solvents are typically degassed _____ _________ ____ ___ ______ ____ _________ _________ __________ _________ ____ ______.
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