Centro de Documentação da PJ
Analítico de Periódico
CD 369
Use of 3D printed platform for GSR quantification using digital image analysis and smartphone [Recurso eletrónico] / A. S. Figueira, F. F. C. Marques, W. F. Pacheco
Revista Brasileira de Criminalística, Brasília, Vol. 14, n.º 3 (2025), p. 7-15
Ficheiro de 580 KB em formato PDF.
ARMA DE FOGO E MUNIÇÕES, ANÁLISE DE VESTÍGIOS, IMPRESSORA, PROCESSAMENTO DE IMAGEM, TELEFONE MÓVEL
For the determination of gunshot residue (GSR) adhesive plaster is commonly used as base to apply the sodium rhodizonate colorimetric test by the police. In this context, this work aims to quantify the GSR deposited on shooter's hand through a 3D printed platform using digital image analysis and smartphone. The methodology is based on the colorimetric test by the formation of the colored Pb–rhodizonate complex, buffered with tartrate solution at pH 2.40 and the quantification is given by the analysis of its digital image in the ImageJ software, which generates histograms containing data relating to the color intensity of each sample. Analytical curves were constructed correlating the analytical signal with GSR in terms of Pb mass. The method was applied in shot tests and proved to be effective after successive cumulative additions of Pb on shooter's hand, which corresponds to 7 consecutive shots of pistol. GSR samples generated from .380 caliber pistol shots showed Pb masses of 2.42 μg, while samples generated after anti-aircraft shots showed Pb masses of 1.38 μg to 1.49 μg. It is expected that the use of the methodology can help in the elucidation of criminal events through a quick and low-cost method.
