Potential of soil organic matter molecular chemistry determined by pyrolysis-gas chromatography/mass spectrometry for forensic investigations

Mazzetto, Josiane M.L.; Melo, Vander Freitas; Bonfleur, Eloana Janice; Vidal‐Torrado, Pablo; Dieckow, Jeferson

doi:10.1016/j.scijus.2019.07.003

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…Thus, in this case, the problems caused by the preheating for the filament and the Curie-point pyrolyzers of evaporation, degradation, or thermosetting before the analysis can be avoided. In addition, the sample is purged of oxygen before heated so that there are no oxidation reactions [22,30,31].…”

Section: Pyrolyzermentioning

confidence: 99%

“…In both techniques, DOM fraction is concentrated by reverse phase mechanisms. The characterization of soil and sediment organic matter does not requires extraction, just to dry, sieve and pulverize the soil [30,31,40,41]. However, there are many types of organic matter fractions, one of them commonly determined also in soils is DOM that can be extracted using a lysimeter-pump or by shaking soil with water [42].…”

Section: Characterization Of Organic Mattermentioning

confidence: 99%

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Pyrolysis gas chromatography-mass spectrometry in environmental analysis: Focus on organic matter and microplastics

Picó

Barceló

2020

TrAC Trends in Analytical Chemistry

170

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Section: Pyrolyzermentioning

confidence: 99%

Section: Characterization Of Organic Mattermentioning

confidence: 99%

Pyrolysis gas chromatography-mass spectrometry in environmental analysis: Focus on organic matter and microplastics

Picó

Barceló

2020

TrAC Trends in Analytical Chemistry

170

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“…Traditional forensic approaches in Brazil have focused on the determination of the total elemental content and the physical fractionation of the soil [14]. In an alternative forensic approach, the composition of soil organic matter is determined by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) [15].…”

Section: Introductionmentioning

confidence: 99%

Soil Colour and Plant-Wax Markers: Application in Forensic Investigations under Urban Subtropical Environments

et al. 2022

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Most cases involving soil in criminal investigations in Brazil have focused on the chemical and mineralogical analyses of soil fractions without including the organic matter. The organic fraction contains plant-wax markers which may be useful to “fingerprint” forensic soils due to their chemical diversity, relative longevity and resistant nature. The aim of this study was to test the long- (kilometre), medium- (metre) and short- (centimetre) scale variability of plant-wax biomarkers in a forensic context in anthropised urban soils and soils developed under subtropical conditions. Two areas from the Curitiba municipality and two areas from the Colombo municipality, Paraná State, South Brazil, were selected. Soil colour analysis was carried out to obtain reflectance data over the 360–740 nm wavelength range. Furthermore, plant-wax marker compounds (n-alkanes and fatty-alcohols) were assessed by extraction and separation into different classes and an analysis of the compounds by gas chromatography (GC/MS). The compositions of the wax-marker profiles were different in samples collected side-by-side, showing sensitivity to local variations under subtropical conditions and in areas under intense human urban disturbance. Under these conditions, biomarkers may be used in real crime scenes, even on a micrometric scale of variation.

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“…[2][3][4] The association between soil traces and investigated objects can provide a background to the criminal context, also making it possible to trace the sequence of events that occurred in the criminal dynamics. 5,6 Mineral compositions and structures in soil clay-sized fraction can reflect unusual characteristics when analyzed by specific techniques. Within this document the term clay is in reference to particle size (<2 μm equivalent spherical diameter) rather than clay minerals.…”

Section: Introductionmentioning

confidence: 99%

“…Soils can provide important information in criminal investigations, because they often have distinctive chemical, physical, biological and mineralogical properties, which make it possible to differentiate them in most environments and to test for association of a particular item with a crime scene, depending on the context of the criminal investigation 2–4 . The association between soil traces and investigated objects can provide a background to the criminal context, also making it possible to trace the sequence of events that occurred in the criminal dynamics 5, 6 …”

Section: Introductionmentioning

confidence: 99%

Conjunctive use of synchrotron X‐ray diffraction and Rietveld refinement in Fe‐oxide clays for forensic applications

Testoni

Prandel

Melo

et al. 2022

Journal of Forensic Sciences

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Soils have distinctive chemical, physical, mineralogical and biological properties, which make it possible to differentiate them in different environments and also to test for an association of a particular questioned item with a crime scene. Mineral compositions and structures in the soil clay fraction can reflect a distinct characteristic when analyzed by powerful techniques. In this way, the aim of this study was to compare the discriminative power of Fe-oxides concentrated clay samples from the same soil class with and without differences in parent material when analyzed using the Rietveld method and two sources of X-ray diffraction: conventional and high-resolution synchrotron radiations. Clay samples were Fe concentrated (kaolinite and gibbsite removal) to clarify mineralogical composition of 12 samples from three simulated crime scenes, developed under claystone and granite. By Rietveld refinement, detailed crystallographic data were obtained to discriminate samples according their provenance. By synchrotron radiation, mineral data demonstrated the power of quantitative (crystallite size and minerals contents) and qualitative (identification of majoritarian and accessory minerals) analysis by Rietveld refinement, which provides well-resolved data able to discriminate samples from different and same geology.The techniques can be applied in other criminal investigations given their potential of discrimination.

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Potential of soil organic matter molecular chemistry determined by pyrolysis-gas chromatography/mass spectrometry for forensic investigations

Cited by 19 publications

References 26 publications

Pyrolysis gas chromatography-mass spectrometry in environmental analysis: Focus on organic matter and microplastics

Pyrolysis gas chromatography-mass spectrometry in environmental analysis: Focus on organic matter and microplastics

Soil Colour and Plant-Wax Markers: Application in Forensic Investigations under Urban Subtropical Environments

Conjunctive use of synchrotron X‐ray diffraction and Rietveld refinement in Fe‐oxide clays for forensic applications

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