FORS-2107EL Lecture Notes - Lecture 13: Thiocyanate, Urk, Glycerol
27 Jun 2018
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Forensic Science - Day 13 2018.03.05.
Drug Analysis and Identification
-Identification of unknown substances suspected to be drugs generally consists of a
combination of:
-Visual inspection (not very common anymore)
-This is of limited value, but may be useful in guiding the progression of
subsequent analyses
-Additionally, seized tablets may be identified in part by their shape, colour, and
markings (especially pharmaceuticals)
-Presumptive Testing (always followed by a confirmatory test)
-Confirmatory Test (Eg. MS)
Presumptive Testing
-Presumptive methods provide results that are used to indicate whether the
compounds of interest are likely present in a sample
-Positive presumptive test generally indicate that further confirmatory/quantitative
analysis is warranted and required
-Presumptive test are often in the form of colour test
Colour Tests
-React with reagents to form a colour
-This is used in the field to examine material suspected of containing a drug
-Screening only, so never taken as conclusive ID
-Must be simple and fast enough that any emergency responder can do this
Marquis Test
-2% formaldehyde in sulfuric acid
-Purple in presence of heroin, morphine and most opium derivatives
-Orange-brown with amphetamines and mathamphetmaines
Duquenois-Levine Test
-Test for cannabinoids (ex. marijuana)
-Solution A-2% vanillin + 1% acetaldehyde in ethyl alcohol
-Solution B - concentrated HCl
-Solution C - chloroform
-Positive result: purple colour in chloroform layer
find more resources at oneclass.com
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Document Summary
Identi cation of unknown substances suspected to be drugs generally consists of a combination of: This is of limited value, but may be useful in guiding the progression of subsequent analyses. Additionally, seized tablets may be identi ed in part by their shape, colour, and markings (especially pharmaceuticals) Presumptive testing (always followed by a con rmatory test) Presumptive methods provide results that are used to indicate whether the compounds of interest are likely present in a sample. Positive presumptive test generally indicate that further con rmatory/quantitative analysis is warranted and required. Presumptive test are often in the form of colour test. React with reagents to form a colour. This is used in the eld to examine material suspected of containing a drug. Screening only, so never taken as conclusive id. Must be simple and fast enough that any emergency responder can do this. Purple in presence of heroin, morphine and most opium derivatives.
