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CHROMIUM ELECTROANALYSIS AT SCREEN PRINTED ELECTRODE MODIFIED BY THIN FILMS OF NICKEL
Citation:
Mishra, N N., K R. Rogers, AND J. Wang. CHROMIUM ELECTROANALYSIS AT SCREEN PRINTED ELECTRODE MODIFIED BY THIN FILMS OF NICKEL. Presented at American Chemical Society, Orlando, FL, April 7-11, 2002.
Impact/Purpose:
The overall objective of this task is to develop scientifically sound sampling and bioanalytical approaches for screening and monitoring of hazardous wastes. These techniques are expected to provide the Agency with improved screening and field portable methods to characterize, reduce, and control risk to human health and the environment. Specific objectives will include development and characterization of the following concepts:
SPMDs for passive accumulation of TICs
Bioassays for toxic and genotoxic compounds
MIPs for volatile and semivolatile toxic organics
Rapid screening assays using the previously listed components.
Description:
A rapid and potentially cost-effective electrochemical method is reported for analysis of chromium (VI) and Chromium(III) using a nickel modified screen printed carbon ink electrode. Electrochemical characteristics of nickel modified electrode as well voltammetric behavior for chromium with electrolyte and non electrolyte media are discussed. Scanning electron micrographs and elemental analysis of nickel film yield an indication of the structural features of the electrode surface. The nickel electrode responds well to both Chromium (VI) and Chromium(III) over the concentration range of 0.1 ppb 10 ppb. This method is also proposed to analyze cadmium, copper and lead in environmental samples. One advantage of this method is that the nickel electrode is sensitive, stable and environmentally friendly compared to mercury film electrodes which are typically used for chromium analysis. The potential development of this method for field analysis is also discussed.
The U.S. Environmental Protection Agency (EPA), through its Office of Research and Development (ORD), funded this research and approved this abstract as a basis for an oral presentation. The actual presentation has not been peer reviewed by EPA.