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Test/QA Plan for Verification of Nitrate Sensors for Groundwater Remediation Monitoring
Citation:
MCKERNAN, J., A. Barton, AND A. Dindal. Test/QA Plan for Verification of Nitrate Sensors for Groundwater Remediation Monitoring. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/104, 2010.
Impact/Purpose:
To inform public
Description:
A submersible nitrate sensor is capable of collecting in-situ measurements of dissolved nitrate concentrations in groundwater. Although several types of nitrate sensors currently exist, this verification test will focus on submersible sensors equipped with a nitrate-specific ion-selective electrode (ISE) for monitoring dissolved nitrate concentrations. Nitrate-specific ISE sensors typically work on the principal of direct potentiometry, whereby two electrodes (a sensing electrode and a reference electrode) are contained within the sensor unit. The reference electrode is immersed in a solution of a constant nitrate concentration within the sensor housing, and ionic charge transfer between this solution and the sensing electrode is measured and converted to a concentration that is representative of a dissolved nitrate concentration of the aqueous solution being analyzed.
URLs/Downloads:
TEST/QA PLAN FOR VERIFICATION OF NITRATE SENSORS FOR GROUNDWATER REMEDIATION MONITORINGVT-AMS Webpage