See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/291844836 Isotopic Analogue as the Internal Standard for Quantitative Determination of Benzoylecgonine: Concerns with Isotopic Purity and Concentration Level Article in Journal of Forensic Sciences · July 1989 DOI: 10.1520/JFS12725J CITATIONS READS 15 138 authors, including: Ray H Liu Sahil Walia Forensic Science Review; University of Alabama at Birmingham Seton Hall University 124 PUBLICATIONS 2,033 CITATIONS 37 PUBLICATIONS 528 CITATIONS SEE PROFILE All content following this page was uploaded by Ray H Liu on 04 March 2016 The user has requested enhancement of the downloaded file SEE PROFILE View publication stats