Sensor Research and Development Corporation (SRD) has been contracted to develop and deliver a prototype instrument capable of the in situ detection and measurement of low levels of gaseous mercury for use in thermal treatment process control applications and continuous emissions monitoring. The goal is to develop a fast, simple, inexpensive and reliable in situ sensor instrument for detecting and monitoring vaporized mercury that should be able to react to extremely low (less than 200 ppb) levels of mercury vapor, should be site deployable and provide continuous data on either cumulative mercury exposure or instantaneous concentration. To date, a delivery system for gaseous mercury has been designed and constructed, sensor responses have been measured and analyzed for a wide range of sensing film thicknesses and operating temperatures, a microheater and temperature control circuitry and software have been designed and implemented, and a contract modification, which has received initial approval from DOE, to include measurement of total mercury (both in elemental and reacted forms) has been drafted.
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