Geographic Mapping through the Analysis of Stable Isotopes: Enhancing Post-Mortem Profiles

Abstract

Introduction: The creation of anthropological post-mortem profiles of victims is an essential step in reconstructive human identifications. Geographic origin through the analysis of stable isotopes emerged as valuable reconstructive forensic information, enhancing post-mortem profiles. Objective: To perform the analysis of dental stable isotopes, such as Carbon (δ13C) and Oxygen (δ18O), focusing on potential forensic applications. Material and methods: The sample consisted of a randomly selected lower left canine (#33); a lower left second premolar (#35); and a lower right central incisor (#41) collected from patients with unknown age and gender. The teeth were sectioned in the buccal-lingual direction, enabling to remove dentin powder with a rounded drill. The powdered sample was referred for the analysis of δ13C and δ18O through mass accelerator spectrometry. The obtained data was compared to previous international surveys. Results: The δ13C values ranged from -9,90 to -11,50 per mil, with standard deviation interval between 0,02 and 0,06 per mil. The δ18O values ranged from -7,17 to -8,26 per mil, with standard deviation interval between 0,06 and 0,09 per mil. In face of previous surveys, the obtained data followed a similar trend on the concentration of dental δ13C and δ18O. Conclusions: The analysis of δ13C and δ18O was optimally performed, revealing potential application for forensic purposes.