Hands-on Inquiry-Based Qualitative Identification of Metals in Coins Utilizing Atmospheric Pressure Chemical Ionization Mass Spectrometry

This paper describes the application of an accessible, benchtop mass spectrometer using an Atmospheric Solids Analysis Probe (ASAP) for easy sample introduction, coupled with Atmospheric Pressure Chemical Ionization (APCI) as a soft ionization technique, to the inquiry-based identification of the metal composition of alloys, including coins. Students experience the preparation of metal acetylacetonates via traditional salt metathesis and electrochemical methods. They are then encouraged to immediately apply these newly acquired skills to a novel research problem. The discovery aspect of the practical demonstrates opportunities to develop experimental design early in the undergraduate curriculum.