Potential of soil organic matter molecular chemistry determined by pyrolysis-gas chromatography/mass spectrometry for forensic investigations |
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| Affiliation: | 1. Natural Resource Ecology Laboratory, Colorado State University, 200 West Lake Street, Fort Collins, CO 80523-1499, USA;2. National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401-3305, USA;3. MicroChem Technologies Inc., 8999 W. Harvard Pl., Lakewood, CO 80227-6106, USA;4. Biology Department, Bradley University, 1501 W. Bradley Avenue, Peoria, IL 61625, USA;5. USDA ARS, Cent Great Plains Res Stn, Akron, CO 80720, USA;6. Department of Soil and Crop Sciences, Colorado State University, 200 West Lake Street, Fort Collins, CO 80523-1499, USA;1. Department of Soil Science (LSO), “Luiz de Queiroz” College of Agriculture (ESALQ), University of Sao Paulo (USP), Av. Pádua Dias, 11 Caixa Postal 9, Piracicaba, SP 13418-900, Brazil;2. Department of Soil Quality, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, The Netherlands |
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| Abstract: | Wetlands near urban centers may be more isolated areas and can be chosen for the disposal of bodies or used as a crime scene. The predominant soils in these areas usually have a high content of organic matter (OM), classified as Histosols. Soil organic matter (SOM) is composed of many different compounds that can be identified by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The study aimed to use Py-GC/MS to classify small amounts of organic soil in a forensic context. We sampled Histosols from five representative sites of Curitiba, Brazil. The molecular composition of the samples was determined by byPy-GC/MS. The factor analysis was carried out, and the factor scores showed a clear differentiation between the sites. Compounds indicative of relatively fresh plant material was separated from more recalcitrant and charred material. Py-GC/MS has the potential to be a useful tool to study the composition of SOM in Histosols to track the trace sample collected from a crime suspect. |
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