training of chemistry students in the institute of forensic research
DESCRIPTION
Training of chemistry students in the Institute of Forensic Research. Janina Zięba-Palus. Forensic Chemistry. Lecture: „Chemistry in criminslistics” – 30 h „Forensic Toxicology” - 30 h Laboratory courses (each 5 h) - PowerPoint PPT PresentationTRANSCRIPT
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Training of chemistry studentsTraining of chemistry students
in the Institute of Forensic in the Institute of Forensic ResearchResearch
Janina Zięba-PalusJanina Zięba-Palus
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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
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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
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• 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
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Moreover,
• students of Strathclyde University (Glasgow) prepare their master thesis – 3 months
• students from Fachschule in Instein (Germany) – practical training during 5 months
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PaintsPaints
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Optical microscopy:Optical microscopy:
- morphology- morphology
- layer structure- layer structure
- colourcolour
- pigmentspigments
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IR spectroscopy –SEM/EDXIR spectroscopy –SEM/EDX
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IR spectroscopyIR spectroscopychemical content of each layerchemical content of each layer
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FibresFibres
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Optical microscopy, SEMOptical microscopy, SEM - - morphologymorphology
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Vis Vis spectroscopyspectroscopy
comparison of fibre comparison of fibre colourcolour
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IR spectroscopyIR spectroscopy
identification of polymer
(type of fibre)
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GlassGlass
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Grim 2Grim 2
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RI measurementRI measurement
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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
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- ślady organiczne
- ślady nieorganiczne
GSRGSR
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Metal particlesMetal particles
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Metal particles:- spherical shape- several microns in diameter- specific composition
SEM/EDXSEM/EDX
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InksInks
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absorption in white light
absorption in IR light
VSCVSC
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600 800 1000 1200 1400 1600 1800
red gel 03 PRAXIS red gel 03 FORAM red gel 03 Renishow
Raman Raman spectroscopyspectroscopy
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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
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black ink
acid blue
blue gel
glicerine
styrene
IR spectroscopyIR spectroscopy