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In chemistry, a masking agent is an additive used in sample preparation to prevent interfering substances from affecting the analysis of a desired analyte. These agents work by reacting with potential interferents, converting them into a form that does not interfere with subsequent steps, such as measurement. Masking agents are employed in various analytical techniques, including spectrophotometry, gravimetry, titrimetry, and voltammetry. They can also be used to convert interferents into nonextractable species during solvent extraction processes. The goal is to facilitate an accurate measurement by removing impediments to the analytical process.12

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