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                            Library & Multimedia
 Reagentless Voltammetric Identification of Cocaine from Complex Powders
NCJ Number
              307637
Journal

*Analytical Chemistry* Volume: 94 Issue: 37 Dated: 2022 Pages: 12638-12644
Author(s)
          Kathryn J. Vannoy;
                        Lynn E. Krushinski;
                        Edgar F. Kong;
                        Jeffrey E. Dick
Date Published

2022
Length
              7 pages
Annotation
              This study increases the pH at the electrode surface by driving water reduction, effectively electroprecipitating the cocaine base, and demonstrates excellent selectivity to cocaine compared to common adulterants.
Abstract
              This study takes advantage of the electrochemical window of water to increase the pH at the electrode surface by driving water reduction, effectively electroprecipitating the cocaine base, and demonstrates excellent selectivity to cocaine compared to common adulterants, such as procaine, lidocaine, benzocaine, caffeine, and levamisole. Finally, the authors detect cocaine on a carbon fiber microelectrode, demonstrating miniaturizability and allowing access to low-resistance media (e.g., tap water). The precipitate on the electrode surface is electrochemically oxidized by a voltammetric sweep through sufficiently positive potentials. Cocaine is one of the most commonly trafficked and abused drugs in the United States, and deployable field tests are important for rapid identification in nonlaboratory settings. At present, colorimetric tests exist for in-field determination, but these fundamentally suffer from interferent effects. Cocaine is an organic salt that is readily water soluble as a cation and almost insoluble in the deprotonated neutral form.  (Published Abstract Provided)
      
  
          Additional Details
Grant Number(s)
        2020-R2-CX-0036


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Publication Type
        Research (Applied/Empirical)


  
  
        
  Award
        Rapid In-Field Analysis of Illicit Substances in Unknown Powders and Aerosols
    
  
  
Date Published: January 1, 2022
    
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