A NITRIC ACID DRY DEPOSITION EDDY CORRELATION FLUXMETER

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$50,000.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
14542
Agency Tracking Number:
14542
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Aerodyne Research Inc (Currently AERODYNE RESEARCH, INC.)
45 Manning Road, Billerica, MA, 01821
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Mark S Zahniser
() -
Business Contact:
(508) 663-9500
Research Institution:
n/a
Abstract
NITRIC ACID IN THE GAS PHASE IS ONE OF THE MOST ABUNDANT TRACE NITROGEN OXIDE SPECIES IN THE ATMOSPHERE. ITS DEPOSITION AT THE SURFACE PROVIDES THE MAJOR SINK FOR NOX AND IS A SIGNIFICANT COMPONENT OF ACID PRECIPITATION. THE GOAL OF THIS PROJECT IS TO DEVELOP AN INSTRUMENT TO MEASURE THE SURFACE FLUXES OF NITRIC ACID USING THE EDDY CORRELATIONTECHNIQUE WITH INFRARED TUNABLE DIODE LASER ABSORPTION FOR THE DIRECT DETECTION OF HNO3. THE INSTRUMENT USES A NOVEL, MULTIPLE-PASS ABSORPTION CELL THAT MAXIMIZES THE OPTICAL PATHLENGTH IN A MINIMAL VOLUME TO PROVIDE SUFFICIENT TIME RESPONSE (0.1 SEC) FOR EDDY CORRELATION MEASUREMENTS. A KEYCOMPONENT OF THE SYSTEM IS THE DESIGN OF A SUPERSONIC INLET THAT WILL MINIMIZE THE EFFECTS OF SURFACE ABSORPTION AND DESORPTION ON THE WALLS OF THE INLET AND DETECTOR. THE PHASE I STUDY WILL OPTIMIZE AND TEST THE SAMPLING CELL TIME RESPONSE AND WILL RESOLVE CRITICAL DESIGN ISSUES LEADING TO THE DEVELOPMENT OF A FIELD INSTRUMENT FOR HNO3 DETECTION AT THE 100 PPT LEVEL IN PHASE II. THE FINAL INSTRUMENT WILLALSO BE APPLICABLE TO FLUX MEASUREMENTS OF OTHER REACTIVE TRACE GASES INCLUDING SULFUR DIOXIDE, NITRIC OXIDE, OZONE, AMMONIA, AND HYDROGEN PEROXIDE.

* information listed above is at the time of submission.

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