1 / 30

PART 3

PART 3. Forensic Drug Analysis CONFIRMATION TESTS LABORATORY BASED DRUG TESTS. Confirmation Tests. Tests that are performed after screening tests are complete to signify exactly what the unknown substance is. Qualitative and Quantitative Tests are performed.

loring
Download Presentation

PART 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PART 3 Forensic Drug Analysis CONFIRMATION TESTS LABORATORY BASED DRUG TESTS

  2. Confirmation Tests Tests that are performed after screening tests are complete to signify exactly what the unknown substance is. Qualitative and Quantitative Tests are performed. A Qualitative test is performed first (to tell what type of drug is present) A Quantitative test is done second (to tell how much drug is present.) Example: A white powder maybe 20% cocaine, 80% baking soda

  3. FIVE tests used by Forensic Chemists to determine an unknown drug • COLORTEST (5) PRESUMPTIVE TEST • MICORCRYSTALLINE TEST CONFIRMATION TEST • CHROMATOGRAPY TEST (2) CONFIRMATION TEST • SPECTROPHOTOMETRY (2) CONFIRMATION TEST • MASS SPECTROMETRY CONFIRMATION TEST

  4. COLORTEST (5) • Marquis Test= Identifies alkaloid drugs (pH 8.2-11.0). A mixture of formaldehyde and sulfuric acid drips into the drug for a color change. The color indicates the drug. MOST ECSTACY DRUG KITS have the contents of the Marquis Test. Dark purple= Ecstacy, Orange-brown= Meth, Excederin= dark red • Dillie-Koppanyi Test= reagent= methanol Barbiturates turn violet-blue • Duquenois-Levine Test= in the test is Ethanal, Vanillin, HCl, chloroform. Marijuana turns purple • Van Urk Test=an aldehyde in HCl/ H2SO4LSD= purple, Psilocybin (mushrooms)= red-brown • Scott Test= reagent= Cobalt thiocyanate/HCl/Chloroform Cocaine turns blue, pink, blue

  5. Spot tests Identification

  6. Marquis Dillie-Koppanyi Duquenois-Levine

  7. MICROCYSTALLINE TEST

  8. MICROCYSTALLINE TEST A test in which the scientist adds a drop of the suspected substance to a chemical on a slide. The mixture will begin to form crystals. Each type of drug has an individual crystal pattern when seen under a polarized light microscope. COCAINE METHAMPHETAMINE

  9. CHROMATOGRAPHY

  10. Forensic Chromatography Lab

  11. LC or GC High performance liquid chromatography and gas chromatography are extremely sensitive techniques utilized in the analysis of drugs, body fluids, fire accelerants.

  12. Types of Chromatography • Paper Chromatography • Gas Chromatography • Liquid Chromatography • Thin-Layer Chromatography • Ion Exchange Chromatography • Affinity Chromatography Chromatography is used extensively in forensics, from analyzing body fluids for the presence of illicit drugs, to fiber analysis, blood analysis from a crime scene, and at airports to detect residue from explosives

  13. CHROMATOGRAPY • Separate and Identify components of a drug. • It involves passing a mixture dissolved in a "mobile phase" through a stationary phase, which separates the compound to be measured from other molecules in the mixture based on differential partitioning between the mobile and stationary bases

  14. Chromatograph of THC

  15. Thin-Layer Chromatography • Thin layer chromatography (TLC) is a chromatography technique used to separate mixtures. • Thin layer chromatography is performed on a sheet of glass, plastic, or aluminum foil, which is coated with a thin layer of adsorbent material, usually silica gel. • This layer of adsorbent is known as the stationary phase

  16. Gas Chromatography • Book on chromatography • $100 • 300 pages of graphs

  17. GC machine • GC machines can cost $600- $30,000 • Average cost is $16,000

  18. GC analysis

  19. Spectrophotometry

  20. Mass Spectrometry • A band of charged particles of different masses formed when a beam of ions is passed through the deflecting fields of a mass spectroscope, from which the masses of atoms, molecules, or isotopes can be determined.

  21. Mass Spectrum of Ephedrine and Pseudoephedrine

  22. UV-visible light spectrometers UV-visible light spectrometers are employed for accurate quantitative analysis of colored samples

  23. Infrared (IR) Spectrophotometry • Equivalent to a human’s fingerprint in terms of drug identification

  24. IR spectrum of Cocaine base

  25. How much does a Mass-Spec cost? $100,000 to $800,000 depending on functions

  26. Mass Spec of Caffeine

  27. GC/MSGas chromatography/mass spectrometry • Isolates the drug from any mixing agents or other substances that might be combined with it. • A small amount of the substance is injected into the gas chromatograph. • Different molecules move through the chromatograph's column at different speeds based on their density. • For example, heavier compounds move more slowly, while lighter compounds move more quickly. • Then the sample is funneled into a mass spectrometer, where an electron beam hits it and causes it to break apart. • How the substance breaks apart can help the technicians tell what type of substance it is.

  28. GC/MS Gas Chromatograph Mass Spectrometer, is used to separate, detect, identify and determine the content of chemicals in a large variety of samples. GC/MS is the preferred confirmatory method of analysis by the National Institute on Drug Abuse

More Related