Forensic Entomology: A Career Overview By Nathan Klinski Forensic Chemistry.
Training of chemistry students in the Institute of Forensic Research
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Transcript of Training of chemistry students in the Institute of Forensic Research
Training of chemistry studentsTraining of chemistry students
in the Institute of Forensic in the Institute of Forensic ResearchResearch
Janina Zięba-PalusJanina Zięba-Palus
Lecture: „Chemistry in criminslistics” – 30 h
„Forensic Toxicology” - 30 h
Laboratory courses (each 5 h)
examination of paint
fibres identifacation
examination of glass
GSR examination
examination of ink
drugs
inorganic poisons
Seminar (1 h) - before each laboratory taining
Forensic ChemistryForensic Chemistry
Participants:Participants:• students of chemistry (4th year of study)
• group consist of 12 - 14 people
• during lab training students are divided into two groups
• performing practical exercises using analytical equipment (microscopes, spectrometers) and preparing reports basing on the obtained results
• they elaborate „mini projects”- research and literature study in the field of forensic chemistry – 4th year, II semester
• they elaborate master thesis during two semesters - 5th year:
- on identification of car paints by the use of IR, SEM/EDX,
Py-GC/MS or Vis spectrometry
- on examination of GSR by the use of SEM/EDX
- on differentiation of glass fragments using SEM/EDX , RI
- on identification of fibres using optical microscopy
- on organic and inorganic poisons identification
• summer practice is performed – two weeks
• sometimes they are employed within research project financed
by Polish government and EU
Moreover,
• students of Strathclyde University (Glasgow) prepare their master thesis – 3 months
• students from Fachschule in Instein (Germany) – practical training during 5 months
PaintsPaints
Optical microscopy:Optical microscopy:
- morphology- morphology
- layer structure- layer structure
- colourcolour
- pigmentspigments
IR spectroscopy –SEM/EDXIR spectroscopy –SEM/EDX
IR spectroscopyIR spectroscopychemical content of each layerchemical content of each layer
FibresFibres
Optical microscopy, SEMOptical microscopy, SEM - - morphologymorphology
Vis Vis spectroscopyspectroscopy
comparison of fibre comparison of fibre colourcolour
IR spectroscopyIR spectroscopy
identification of polymer
(type of fibre)
GlassGlass
Grim 2Grim 2
RI measurementRI measurement
SEM/EDXSEM/EDX – quantitative elemental – quantitative elemental analysis in order to analysis in order to classifclassify and y and
comparecompare of glass fragments of glass fragments using using chemometric methodschemometric methods
- ślady organiczne
- ślady nieorganiczne
GSRGSR
Metal particlesMetal particles
Metal particles:- spherical shape- several microns in diameter- specific composition
SEM/EDXSEM/EDX
InksInks
absorption in white light
absorption in IR light
VSCVSC
600 800 1000 1200 1400 1600 1800
red gel 03 PRAXIS red gel 03 FORAM red gel 03 Renishow
Raman Raman spectroscopyspectroscopy
Extraction solution
• Pyridine
1. Isolation of writing materials from paper
Three types of elution solutions
• Butanol : ethanol : Distilled water : acetic acid
• Ethyl acetate : ethanol : distilled water
• Ethyl acetate : propanol : distilled water : acetic acid
2. Developing of chromatograms
Observation of chromatograms in UV/VIS light
3. Interpretation of chromatograms
black ink
acid blue
blue gel
glicerine
styrene
IR spectroscopyIR spectroscopy