Portable Sensor for the Detection of Nitrates and Nitrites in Groundwater

This SBIR proposal describes a program to develop a small, portable, low-power amperometric nitrate and nitrite sensor for groundwater. A renewable, robust sensor integrated into a microfluidic system is proposed and will be designed to specifically detect nitrate and nitrite anions without significant dilution or reduction in the sensitivity of the detected species. The proposed microfluidic, electrochemical sensor will use sol-gel modified, screen-printed microelectrodes which will enhance the sensitivity and limit of detection of the device compared to electrodes of conventional size. The device will also use a simple pump and valve system for both electrolyte and sample introduction into the sensor compartment and proven electrochemical instrumentation for nitrate and nitrite detection. The proposed sensor will be applicable to real time, on-site monitoring of nitrate and nitrite concentrations in groundwater.