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1998 Progress Report: Hybrid Electrochemical-Piezoelectric Sensor for RCRA Metals in Groundwater: Detection of Hexavalent Chromium
EPA Contract Number: 68D99077Title: Hybrid Electrochemical-Piezoelectric Sensor for RCRA Metals in Groundwater: Detection of Hexavalent Chromium
Investigators: Andle, Jeffrey C.
Small Business: BIODE Inc.
EPA Contact: Manager, SBIR Program
Phase: II
Project Period: September 1, 1999 through September 1, 2001
Project Period Covered by this Report: September 1, 1997 through September 1, 1998
Project Amount: $224,155
RFA: Small Business Innovation Research (SBIR) - Phase II (1998)
Research Category: SBIR - Monitoring and Analysis , Ecological Indicators/Assessment/Restoration
Description:
BIODE has developed a hybrid sensor that combines the sensitivity of piezoelectric nanobalance technology with the selectivity of stripping potentiometric analysis for the detection of ionic mercury in aqueous samples. This previous SBIR project has resulted in a single sensor that is capable of detecting single nanogram per milliliter levels of ionic mercury. By improving the electrochemical circuitry and using suitable electrode modification, the technique will be extended to the detection and speciation of additional toxic heavy metal ions and their organometallic complexes. The long-term goal of this SBIR project is an array of electrochemical nanobalances for the simultaneous detection and speciation of all RCRA metals. By pursuing improvements in the piezoelectric element, 10-fold to 100-fold sensitivity increases will be possible. Phase I will demonstrate the feasibility of this sensor system by focusing on the speciation of ionic chromium. Under this project BIODE will demonstrate the ability of the sensor to detect carcinogenic chromium (VI) while distinguishing it from the essential nutrient, chromium (III), and the species already detectable by the sensor, Mercury (II). Phase I will continue to employ quartz shear horizontal acoustic plate mode (SHAPM) sensors with single nanogram sensitivity and improved sensitivity. Supplemental Keywords:small business, SBIR, monitoring, analytical, engineering, chemistry, EPA. , Ecosystem Protection/Environmental Exposure & Risk, Toxics, Water, Scientific Discipline, RFA, Engineering, Chemistry, & Physics, Analytical Chemistry, Mercury, Chemistry, mercury transport, 33/50, Monitoring/Modeling, heavy metals, aquatic ecosystem, RCRA metals, chromium & chromium compounds, fate and transport, piezoelectric, electrochemical sensor, aqueous mercury, stripping potentiometric analysis, Chromium, electrochemical , environmental monitoring, mercury & mercury compounds, metals, sensor technology, metal ions, sensor, electrochemical technology, electrochemical analysis
Progress and Final Reports:
Original Abstract
Final Report