The capability of XRF for solving analytical problems in forensic investigations
Description:
X-Ray Fluorescence spectroscopy is a powerful tool for identifying substances and confirming their identity with no sample preparation. The Energy Dispersive X-ray Fluorescence analytical microscope (micro-EDXRF) enables the recording of the spectra of tiny particles (as small as 10 microns) and a hyperspectral image of objects. Therefore, the data can be analyzed for unsuspected features after collecting them. Chemometric tools can produce chemical distributions of elements and phases in the materials. The bulk analysis helps identify defects in the production of polymers, the quality of the material of saw blades, the make, the model, and the year of a car, based on the analysis of the composition of window glass, etc.
X-ray Fluorescence analytical microscope XGT-9000 was used in this study. The instrument is equipped with a 50W Rh X-ray source and up to four fully-automated spot sizes.
This presentation will show examples of solving analytical problems in forensic investigation. The spectra of different polymers containing filler were measured and analyzed using XRF technology. PCA and DLS-DA allow one to separate "good" and "bad" polymers from different batches. The profile of multi-layer auto paint was measured using a 10-microns X-ray spot size. Patterns of various elements in the multi-layered structure are used to identify the vehicle. The spectra of tiny particles of glasses from several car manufacturers were collected. The PCA model was created based on already known samples and applied to a currently unknown glass particle. The score plot shows the discrimination of the composition of an unknown glass particle from the known materials. It was found that the fillers of authentic and counterfeit pharmaceutical tablets are different. Image analysis of the tablets provides direct evidence of fake products, even though Active Pharmaceutical Ingredient (API) concentration is almost the same.
Speaker: Sergey Mamedov - HORIBA Scientific
Co-Authors
The capability of XRF for solving analytical problems in forensic investigations
Category
2023 Call for Oral Abstracts
Description
Session Number: C44-01
Session Type:
Session Date: Tuesday 3/21/2023
Session Time: 1:30 PM - 4:25 PM
Room Number: 115C
Track: Forensics & Toxicology
Category: Atomic Spectroscopy/Elemental Analysis, Forensics, Material Science
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