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Forensic Sci Int ; 305: 109947, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31639636


Soil is commonly analyzed to provide evidence because soil particles adhere to almost everything that may be of forensic interest. Particles derived from soil can be quantitatively analyzed by scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDS). We developed a semi-automated SEM-EDS method for analyzing soil minerals. Soil was analyzed using the SEM-EDS automated particle analysis program, then the mineral species were identified from their chemical components. Chi-squared tests were used to discriminate between different minerals, and these tests were also applied to soil samples. The method put samples with the same parent population into the same group and discriminated between samples with different parent populations even when 26 particles were analyzed. The method successfully identified most soil samples with different parent populations as different. The results proved that the method could be used in forensic cases and provide new insights into the forensic analysis of soil samples.

Forensic Sci Int ; 282: 86-91, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29174515


Methods to quickly purify methamphetamine hydrochloride from the cutting agent dimethyl sulfone for subsequent identification of confiscated crystalline samples using infrared absorption spectroscopy were compared and evaluated. Although sequential solvation and reprecipitation methods were simple, spectral contamination from dimethyl sulfone was inevitable and might affect the interpretation of the spectra. In addition, methamphetamine hydrochloride and dimethyl sulfone could form a solid solution because of solvation of both crystals into a single solution layer. By contrast, sublimation was an effective method for separation of methamphetamine hydrochloride and dimethyl sulfone. Sublimation combined with infrared absorption spectroscopy enabled rapid identification of crystalline methamphetamine hydrochloride.