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A dispersive solid‐phase extraction method based on a new sorbent has been performed on plasma and wastewater samples to determine metoprolol by high‐performance liquid chromatography–tandem mass spectrometry. In this study, the analyte was adsorbed from the samples onto microcrystalline cellulose as a green and efficient sorbent and then eluted for use in the determination step. In the mass spectrometer,...
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