TY - JOUR
T1 - Temperature and humidity controlled nephelometry
T2 - Improvements and calibration
AU - Rood, Mark J
AU - Covert, D. S.
AU - Larson, T. V.
PY - 1987
Y1 - 1987
N2 - An aerosol sampling instrument that measures the light scattering extinction coefficient of submicrometer aerosol particles under controlled relative humidity and temperature conditions has been improved. The instrument has the capability to detect and quantify the sulfate ion mass concentration and the ammonium-to-sulfate molar ratio of aerosols by analysis of the aerosolșs thermal decomposition profile, hygroscopic characteristics, and reactivity with gaseous NH3. As a result of the addition of a preheater-cooler assembly and improvements in the instrumentșs humidifier, heater, and cooler, sulfate ion mass concentration can be quantified at 0.5 μg/m3 with a 30-min averaging time. Also, the ammonium-to-sulfate molar ratio can be determined over a range from 0.0 to 2.0 with a precision of 0.2. The system was also calibrated to determine its response and sensitivity to aerosol particulate composition, relative humidity, thermal pretreatment, ammonia injection, and aerosol particle size.
AB - An aerosol sampling instrument that measures the light scattering extinction coefficient of submicrometer aerosol particles under controlled relative humidity and temperature conditions has been improved. The instrument has the capability to detect and quantify the sulfate ion mass concentration and the ammonium-to-sulfate molar ratio of aerosols by analysis of the aerosolșs thermal decomposition profile, hygroscopic characteristics, and reactivity with gaseous NH3. As a result of the addition of a preheater-cooler assembly and improvements in the instrumentșs humidifier, heater, and cooler, sulfate ion mass concentration can be quantified at 0.5 μg/m3 with a 30-min averaging time. Also, the ammonium-to-sulfate molar ratio can be determined over a range from 0.0 to 2.0 with a precision of 0.2. The system was also calibrated to determine its response and sensitivity to aerosol particulate composition, relative humidity, thermal pretreatment, ammonia injection, and aerosol particle size.
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U2 - 10.1080/02786828708959146
DO - 10.1080/02786828708959146
M3 - Article
AN - SCOPUS:0023173812
SN - 0278-6826
VL - 7
SP - 57
EP - 65
JO - Aerosol Science and Technology
JF - Aerosol Science and Technology
IS - 1
ER -