Improved Gas Chromatography/Mass Spectrometry Analysis of Barbiturates in Urine Using Centrifuge-Based Solid-Phase Extraction, Methylation, with d5-Pentobarbital as Internal Standard

  • Ray H. Liu, Angela M. McKeehan, Cinnamon Edwards, Garon Foster, Wayne D. Bensley, Jeffrey G. Langner, Amrik S. Walia
  • Journal of Forensic Sciences, November 1994, ASTM International
  • DOI: 10.1520/jfs13737j

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