Comparative study of the colorimetric method with sodium rhodizonate and use of a technique developed with atomic emission spectroscopy with inductively coupled plasma in the identification of GSR
Keywords:
balística forense; CP-OES; armas de fogo; rodizonato de sódioAbstract
With the high rate of crimes involving the use of firearms it is increasing every day. With the high demand for cases, the need to develop faster and more effective methods is incidental in order to improve the work of the forensic community. The objective of the study is to identify the lead (Pb), barium (Ba) and antimony (Sb) residues, obtained by firing guns from a .380 semi-automatic pistol and a .38 revolver, using an analytical method developed at from studies, in spectroscopy of atomic emission with inductively coupled plasma (ICP-OES), and compare the results with the current colorimetric method, using sodium rhodizonate. For the evaluation of the results, previously 1 and 2 shots were taken, collected with and without hygiene and later analyzed. The colorimetric method has low sensitivity and detects only one of the three characteristic metals, while the ICP-OES is a sensitive, fast and inexpensive technique, being able to perform accurate readings through the optimization of the equipment configurations. It is noteworthy that for the analysis in ICP-OES, a swab embedded in 1% HNO3 was used, while for colorimetric evaluation, only the swab was used as such. The rhodizonate method proved to be flawed, while via spectroscopy promising results were obtained. In general, the study was promising because it identified the fastest and most efficient method, with the possibility of being carried out, for possible validation of the new technique, in order to use it effectively in the routine of expert analyzes.
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