XPS (X-Ray Photoelectron Spectroscopy) Analysis of Etched Dental Crown Metal Surfaces Demonstrates Prior Immersion in Hydrochloric Acid

摘要

Four distinctive dental porcelain fused to metal (PFM) crown artefacts were received in connection with a forensic matter. It was suspected that these crowns had been immersed in hydrochloric acid for seven days. Previous analysis using scanning electron microscopy and EDS (Electron Dispersive Spectroscopy) had demonstrated that the items had been immersed in a corrosive substance, but could not determine specifically what the corrosive had been 1.Examination of the evidential crowns was then undertaken using XPS (X-Ray Photoelectron Spectroscopy) and it was demonstrated that the specific corrosive was indeed hydrochloric acid. The technique is discussed and its strengths and limitations are outlined. This analytical technique may be of relevance to forensic analysts who are required to make similar determinations.