Study of Scott test using spectroscopic techniques: an alternative method for detecting cocaine hydrochloride and its addulterants in street drugs

Química Nova

Romão, Wanderson¹  Universidade Federal do Espírito Santo, Vitória, Brasil¹  Filgueiras, Paulo R.¹  Merlo, Bianca B.¹  Poppi, Ronei J.¹  Conceição, Vitor N.¹  Souza, Lindamara M.¹  Instituto Federal do Espírito Santo, Vila Velha, Brasil¹  Universidade Estadual de Campinas, Campinas, Brasil¹  Superintendência de Polícia Técnico-Científica do Estado do Espírito Santo, Vitória, Brasil¹ 

关键词: colorimetric test;    cocaine;    ATR-;    FTIR;    PLS.;   

DOI  :  10.5935/0100-4042.20140240

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Cocaine is usually seized mixed with a wide variety of adulterants such as benzocaine, lidocaine, caffeine, and procaine. The forensic identification of cocaine in these street drug mixtures is normally performed using colorimetric testing kits, but these tests may suffer from interferences, producing false-positive results. Here, we describe the use of analytical techniques including attenuated total reflection Fourier transform infrared (ATR-FTIR) and ultraviolet-visible (UV-VIS) spectroscopies to distinguish between cocaine and other adulterants (lidocaine, promethazine, powdered milk and yeast) that yield positive results on the Scott test using the thiocyanate cobalt reagent. A further 13 substances were also analyzed using the Scott test.

【 授权许可】

Unknown