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Journal of Chemistry
Volume 2015 (2015), Article ID 737913, 6 pages
http://dx.doi.org/10.1155/2015/737913
Research Article

Detection of Pb, Ba, and Sb in Blowfly Larvae of Porcine Tissue Contaminated with Gunshot Residue by ICP OES

1Federal Institute of Espírito Santo, 29106-010 Vila Velha, ES, Brazil
2Petroleomic and Forensic Laboratory, Department of Chemistry, Federal University of Espírito Santo, 29075-910 Vitória, ES, Brazil
3Department of Criminology, Superintendence of Technical and Scientific Police of Espírito Santo, 29045-402 Vitória, ES, Brazil
4Institute of Chemistry, Federal University of Goiás, 74001-970 Goiânia, GO, Brazil

Received 20 September 2015; Accepted 21 October 2015

Academic Editor: Franco Tassi

Copyright © 2015 Larissa C. Motta et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Lead (Pb), barium (Ba), and antimony (Sb) concentrations were monitored in flies larvae (immature Chrysomya albiceps) contaminated with gunshot residue (GSR) from .40 caliber Taurus pistols during the period of 2 to 12 days after the death of a female pig in decomposition, during the winter, under the influence of rain and high relative humidity. The samples were also analyzed by the colorimetric test using sodium rhodizonate (Feigl-Suter reaction). It was possible to detect and quantify the three metals of interest by inductively coupled plasma-optical emission spectrometry (ICP OES), where the concentrations of all three elements kept practically constant during the putrefaction stage. Minimum ([Pb] = 382.26 μg L−1; [Ba] = 140.50 μg L−1; [Sb] = 39.18 μg L−1) and maximum ([Pb] = 522.66 μg L−1; [Ba] = 190.30 μg L−1; [Sb] = 56.14 μg L−1) concentrations were found during the third and fifth days after death, respectively. ICP OES presented higher sensitivity in metals determination when compared to the conventional colorimetric test, which showed negative result for the GSR extracts obtained from the immature Chrysomya albiceps.