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Atorvastatin is a medication that is used for reducing cholesterol levels. A sensitive and reliable method for TBA detection is required, given that trace amounts of tetrabutylammonium (TBA) are to be found in the presence of atorvastatin and its derivatives. One such method is ion chromatographic separation on the Metrosep C Supp 1 - 250/4.0 with subsequent conductivity detection and sequential suppression.