Standardized test mixture for the characterization of comprehensive two-dimensional gas chromatography columns: the Phillips mix von Dimandja, Jean-Marie D., Clouden, Garrick C., Colón, Ivelisse, Focant, Jean-François, Cabey, Whitney V., Parry, Ritchard C.

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Evaluation of a benchtop ion trap gas chromatographic-tandem mass spectrometric instrument for the analysis of a model drug, tebufelone, in plasma using a stable-isotope internal s... von Wehmeyer, Kenneth R., Knight, Paula M., Parry, Ritchard C.

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Pretreatment of Urine Samples for the Analysis of 11-nor- Delta D9-Tetrahydrocannabinol-9-Carboxylic Acid Using Solid-Phase Extraction von Parry, Ritchard C, Nolan, Lydia, Shirey, Robert E, Wachob, George D, Gisch, Daryl J

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Pretreatment of Urine Samples for the Analysis of 11-nor-Δ9-Tetrahydrocannabinol-9-Carboxylic Acid Using Solid-Phase Extraction von Parry, Ritchard C., Nolan, Lydia, Shirey, Robert E., Wachob, George D., Gisch, Daryl J.

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Solid-phase extraction tubes containing sulfonazide bonded-phase extractants von PARRY, RITCHARD C, GISCH, DARYL J

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Plasma Sample Cleanup for Catecholamines Analysis Using Weak Cation Exchange Solid Phase Extraction von Parry, Ritchard C., Gisch, Daryl J., Wachob, George D.

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