A density gradient technique for use in forensic soil analysis
A high-density aqueous salt solution for the preparation of density gradients is presented. It has been used successfully by the authors in forensic soil analysis. It has a density range that allows for the separation of a soil specimen's heavy mineral components. It has no odor or toxic fumes, which eliminates the need to use a hood during preparation, and is far superior to the organic liquids normally used to prepare density gradients. This liquid should cause many forensic scientists to reexamine their attitudes towards using density gradients in forensic soil casework.
New York City Police Department, Forensic Investigation Division, John Jay College of Criminal Justice, City University of New York, NY, USA.
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Petraco
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Kubic