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

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Presentation transcript:

Training of chemistry students in the Institute of Forensic Research Janina 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 Chemistry

Participants: students of chemistry (4th year of study) group consist of 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 – 4 th year, II semester

they elaborate master thesis during two semesters - 5 th 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

Paints

Optical microscopy: - morphology - layer structure - colour - pigments

IR spectroscopy –SEM/EDX

IR spectroscopy chemical content of each layer

Fibres

Optical microscopy, SEM - morphology

Vis spectroscopy comparison of fibre colour

IR spectroscopy identification of polymer (type of fibre)

Glass

Grim 2

RI measurement

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

GSR

Metal particles

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

Inks

absorption in white light absorption in IR light VSC

Raman spectroscopy

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 spectroscopy