TY - JOUR
T1 - Field performance of a semi-continuous monitor for ambient PM2.5 water-soluble inorganic ions and gases at a suburban site
AU - Young, Li Hao
AU - Li, Chiao Hsin
AU - Lin, Ming Yeng
AU - Hwang, Bing Fang
AU - Hsu, Hui Tsung
AU - Chen, Yu Cheng
AU - Jung, Chau Ren
AU - Chen, Kuan Chi
AU - Cheng, Dung Hung
AU - Wang, Ven Shing
AU - Chiang, Hung Che
AU - Tsai, Perng Jy
N1 - Funding Information:
The authors acknowledge the financial, analytical and administrative support from the Taiwan's National Health Research Institute (NHRI) under the contract number EH-102-SP08 and EH-103-SP03 . In addition, Dr. Yu-Cheng Chen of NHRI contributed equally as the corresponding author. The technical support from the Fortelice International Co., Ltd. is kindly appreciated.
PY - 2016/11/1
Y1 - 2016/11/1
N2 - To reduce sampling artifacts and to improve time-resolved measurements of inorganic aerosol system, a recently commercialized semi-continuous In-situ Gas and Aerosol Composition (IGAC) monitoring system was evaluated against a reference annular denuder system (ADS; denuder/two-stage filter pack) at a suburban site over a year, during which the average PM2.5 was 37.0 ± 24.8 μg/m3. A suite of eight ions SO42−, NO3−, Cl−, NH4+, Na+, K+, Ca2+ and Mg2+ and two gases SO2 and NH3 were the target species. In comparison to the reference ADS method, the IGAC performed well in measuring the major ions SO42−, NO3− and NH4+, and the SO2. For those species, the linear slopes, intercepts and R2 values between the two methods all passed the performance evaluation criteria outlined by earlier similar studies. The performance of IGAC on Cl−, Na+, K+ and NH3 was marginally acceptable, whereas Ca2+ and Mg2+ could not be properly evaluated due to the low concentrations (<0.2 μg/m3) and hence inadequate amount of sample size. The ionic balance of the hourly IGAC samples averaged very close to unity, as did the daily ADS samples, though the former was considerably more variable than the latter. The overall performance of the IGAC has been shown to be comparable to other similar monitors and its improvements are discussed.
AB - To reduce sampling artifacts and to improve time-resolved measurements of inorganic aerosol system, a recently commercialized semi-continuous In-situ Gas and Aerosol Composition (IGAC) monitoring system was evaluated against a reference annular denuder system (ADS; denuder/two-stage filter pack) at a suburban site over a year, during which the average PM2.5 was 37.0 ± 24.8 μg/m3. A suite of eight ions SO42−, NO3−, Cl−, NH4+, Na+, K+, Ca2+ and Mg2+ and two gases SO2 and NH3 were the target species. In comparison to the reference ADS method, the IGAC performed well in measuring the major ions SO42−, NO3− and NH4+, and the SO2. For those species, the linear slopes, intercepts and R2 values between the two methods all passed the performance evaluation criteria outlined by earlier similar studies. The performance of IGAC on Cl−, Na+, K+ and NH3 was marginally acceptable, whereas Ca2+ and Mg2+ could not be properly evaluated due to the low concentrations (<0.2 μg/m3) and hence inadequate amount of sample size. The ionic balance of the hourly IGAC samples averaged very close to unity, as did the daily ADS samples, though the former was considerably more variable than the latter. The overall performance of the IGAC has been shown to be comparable to other similar monitors and its improvements are discussed.
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U2 - 10.1016/j.atmosenv.2016.08.062
DO - 10.1016/j.atmosenv.2016.08.062
M3 - Article
AN - SCOPUS:84988027095
VL - 144
SP - 376
EP - 388
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
ER -