A Remote and Affordable Detection System for Cr(VI) in Groundwater
DOE Phase II Contract DE-FG02-03ER83646
This program will address development of a new method for electrochemical monitoring of hexavalent chromium in groundwater. Chromium contamination is a widespread problem within the DOE complex. The proposed monitoring system offers a reliable and affordable detection scenario for evaluation and remediation of groundwater.
The overall objective of the Phase II program will be to develop a compact, portable, low-cost detection system for hexavalent chromium in water based on a novel electrocatalytic monitoring approach that employs robust, screen-printed electrodes which can specifically detect Cr(VI) in the presence of Cr(III) using a simple flow injection analysis system.
During Phase I, we fabricated miniaturized sensors on chips, proved the technical feasibility of the detection method, and characterized the sensor under a variety of conditions including electrolyte concentration, electrolyte pH, applied electrode potential, and flow rate. Sensitivity, linear dynamic range, detection limits, and response times for this amperometric method were determined and potential interferences present in DOE groundwater were also investigated.
During Phase II work, the methods and apparatus proven feasible during the Phase I program will be refined and optimized to produce a robust, sensitive system for reliable detection of hexavalent chromium in groundwater. The system will utilize microelectrode technology and a novel electrocatalytic approach to electrochemical detection to produce an effective, cost-efficient, long-term, remote detection system for this contaminant.
Electrochemical detection of chromium(VI) in water provides a low-cost portable avenue to on-site, in situ testing for industrial and personal environmental evaluations. Technology to emerge from this program will find applications in drinking water and wastewater analysis, process effluent analysis, electroplating, metal finishing, and environmental remediation.