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Mercury-Free Analysis of Lead in Drinking Water by Anodic Stripping Square Wave Voltammetry

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Jeremy P. Wilburn , Kyle L. Brown and David E. Cliffel

Department of Chemistry, Vanderbilt University, Nashville, TN 37235-1822

J. Chem. Educ., 2007, 84 (2), p 312

DOI: 10.1021/ed084p312

Publication Date (Web): February 1, 2007

Section:

History, Education, and Documentation

Abstract

The analysis of drinking water for lead, which has well-known adverse health effects, provides an instructive example of the use of analytical chemistry to monitor a common hazard of everyday life. Techniques previously utilized for the electrochemical quantitative analysis of lead in tap water have relied on either elemental mercury or a mercury salt to deposit a mercury–lead amalgam on an electrode surface. Modern analytical teaching labs, however, no longer feature mercury setups and avoid most mercuric compounds owing to the toxicity of mercury. We report a mercury-free analytical method for the analysis of lead in drinking water using square wave anodic stripping voltammetry. Concepts required to successfully complete the experiment include: ppm–ppb concentrations, preparation of standard solutions by serial dilution, construction of a calibration curve, determination of an unknown sample by the standard addition method, and sample matrix effects.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Subject):

Quantitative Analysis

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Received: August 03, 2009

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Mercury-Free Analysis of Lead in Drinking Water by Anodic Stripping Square Wave Voltammetry

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Green Synthesis of a Fluorescent Natural Product

Was the Suspect in Contact with the Victim? An Instrumental Methods Experiment for the Analysis of Single Fibers Using FT-IR Microscopy

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