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Solving a Mock Arsenic-Poisoning Case Using Atomic Spectroscopy

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Matthew A. Tarr

Department of Chemistry, University of New Orleans, New Orleans, LA 70148

J. Chem. Educ., 2001, 78 (1), p 61

DOI: 10.1021/ed078p61

Publication Date (Web): January 1, 2001

Section:

History, Education, and Documentation

Abstract

A new upper-level undergraduate atomic spectroscopy laboratory procedure has been developed that presents a realistic problem to students and asks them to assist in solving it. Students are given arsenic-laced soda samples from a mock crime scene. From these samples, they are to gather evidence to help prosecute a murder suspect. The samples are analyzed by inductively coupled plasma atomic emission spectroscopy or by atomic absorbance spectroscopy to determine the content of specific metal impurities. By statistical comparison of the samples' composition, the students determine if the soda samples can be linked to arsenic found in the suspect's home. As much as possible, the procedures and interpretations are developed by the students. Particular emphasis is placed on evaluating the limitations and capabilities of the analytical method with respect to the demands of the problem.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Inquiry-Based / Discovery Learning

Keywords (Subject):

Atomic Properties / Structure

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