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Training of chemistry students in the Institute of Forensic Research

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)

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Training of chemistry students in the Institute of Forensic Research

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  1. Training of chemistry students in the Institute of Forensic Research Janina Zięba-Palus

  2. Forensic Chemistry 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

  3. 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 analyticalequipment(microscopes, spectrometers) and preparing reports basingon the obtained results • they elaborate „mini projects”- research and literature study in the field of forensic chemistry – 4th year, II semester

  4. 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

  5. Moreover, • students of Strathclyde University (Glasgow) prepare their master thesis – 3 months • students from Fachschule in Instein (Germany) – practical training during 5 months

  6. Paints

  7. Optical microscopy: • - morphology • - layer structure • colour • pigments

  8. IR spectroscopy –SEM/EDX

  9. IR spectroscopychemical content of each layer

  10. Fibres

  11. Optical microscopy, SEM - morphology

  12. Vis spectroscopy comparison of fibre colour

  13. IR spectroscopy identification of polymer (type of fibre)

  14. Glass

  15. Grim 2

  16. RI measurement

  17. SEM/EDX – quantitative elemental analysis in order to classify and compare of glass fragments using chemometric methods

  18. GSR

  19. Metal particles

  20. SEM/EDX Metal particles: - spherical shape - several microns in diameter - specific composition

  21. Inks

  22. VSC absorption in white light absorption in IR light

  23. Raman spectroscopy

  24. 1. Isolation of writing materials from paper Extraction solution • Pyridine 2. Developing of chromatograms Three types of elution solutions • Butanol : ethanol : Distilled water : acetic acid • Ethyl acetate : ethanol : distilled water • Ethyl acetate : propanol : distilled water : acetic acid 3. Interpretation of chromatograms Observation of chromatograms in UV/VIS light

  25. IR spectroscopy black ink acid blue blue gel glicerine styrene

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