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NO2 and HONO concentrations measured with filter pack sampling and high HONO/NO2 ratio in Ho Chi Minh city, Vietnam
https://orcid.org/0000-0002-2499-5546
Abstract Nitrogen dioxide and nitrous acid (HONO) in the atmosphere were simultaneously measured with a filter pack (FP) method in Ho Chi Minh City, Vietnam (HCM), in 2017 and 2018. To collect NO2 effectively, the absorption performance of NO2 by the FP method with a triethanolamine (TEA)-impregnated filter was improved. After HNO3 and HONO in the sample air were collected by NaCl and Na2CO3 impregnated filters, respectively, at 2.0 or 4.0 dm3 min−1, NO2 was collected. The air flow was divided into two lines after the HNO3 and HONO filter pack, and one line was used for collecting NO2. With a 0.1 dm3 min−1 flow rate and 20 wt% TEA in the impregnating solution, the collection efficiency of NO2 was almost 100%. The present method was applied for the measurement of HONO and NO2 in HCM in August 2017 and 2018. The average concentrations (29–48 h average) of NO2 and HONO were 17.1 ± 5.7 ppb (average ± 1 standard deviation) and 2.2 ± 0.6 ppb, respectively. The average HONO/NO2 ratio of 13.4 ± 3.5% was significantly higher by a considerable margin than reported values in the literature.
Highlights HONO/NO2 ratio was very high in Ho Chi Minh City, Vietnam. HONO concentration was very high in Ho Chi Minh City, Vietnam. The optimum conditions for NO2 filter pack sampling were determined. The average concentrations of NO2 and HONO were 17.1 and 2.2 ppb, respectively. The average HONO/NO2 ratio was 13.4 ± 3.5% in Ho Chi Minh City, Vietnam.
NO2 and HONO concentrations measured with filter pack sampling and high HONO/NO2 ratio in Ho Chi Minh city, Vietnam
https://orcid.org/0000-0002-2499-5546
Abstract Nitrogen dioxide and nitrous acid (HONO) in the atmosphere were simultaneously measured with a filter pack (FP) method in Ho Chi Minh City, Vietnam (HCM), in 2017 and 2018. To collect NO2 effectively, the absorption performance of NO2 by the FP method with a triethanolamine (TEA)-impregnated filter was improved. After HNO3 and HONO in the sample air were collected by NaCl and Na2CO3 impregnated filters, respectively, at 2.0 or 4.0 dm3 min−1, NO2 was collected. The air flow was divided into two lines after the HNO3 and HONO filter pack, and one line was used for collecting NO2. With a 0.1 dm3 min−1 flow rate and 20 wt% TEA in the impregnating solution, the collection efficiency of NO2 was almost 100%. The present method was applied for the measurement of HONO and NO2 in HCM in August 2017 and 2018. The average concentrations (29–48 h average) of NO2 and HONO were 17.1 ± 5.7 ppb (average ± 1 standard deviation) and 2.2 ± 0.6 ppb, respectively. The average HONO/NO2 ratio of 13.4 ± 3.5% was significantly higher by a considerable margin than reported values in the literature.
Highlights HONO/NO2 ratio was very high in Ho Chi Minh City, Vietnam. HONO concentration was very high in Ho Chi Minh City, Vietnam. The optimum conditions for NO2 filter pack sampling were determined. The average concentrations of NO2 and HONO were 17.1 and 2.2 ppb, respectively. The average HONO/NO2 ratio was 13.4 ± 3.5% in Ho Chi Minh City, Vietnam.
NO2 and HONO concentrations measured with filter pack sampling and high HONO/NO2 ratio in Ho Chi Minh city, Vietnam
https://orcid.org/0000-0002-2499-5546
Abstract Nitrogen dioxide and nitrous acid (HONO) in the atmosphere were simultaneously measured with a filter pack (FP) method in Ho Chi Minh City, Vietnam (HCM), in 2017 and 2018. To collect NO2 effectively, the absorption performance of NO2 by the FP method with a triethanolamine (TEA)-impregnated filter was improved. After HNO3 and HONO in the sample air were collected by NaCl and Na2CO3 impregnated filters, respectively, at 2.0 or 4.0 dm3 min−1, NO2 was collected. The air flow was divided into two lines after the HNO3 and HONO filter pack, and one line was used for collecting NO2. With a 0.1 dm3 min−1 flow rate and 20 wt% TEA in the impregnating solution, the collection efficiency of NO2 was almost 100%. The present method was applied for the measurement of HONO and NO2 in HCM in August 2017 and 2018. The average concentrations (29–48 h average) of NO2 and HONO were 17.1 ± 5.7 ppb (average ± 1 standard deviation) and 2.2 ± 0.6 ppb, respectively. The average HONO/NO2 ratio of 13.4 ± 3.5% was significantly higher by a considerable margin than reported values in the literature.
Highlights HONO/NO2 ratio was very high in Ho Chi Minh City, Vietnam. HONO concentration was very high in Ho Chi Minh City, Vietnam. The optimum conditions for NO2 filter pack sampling were determined. The average concentrations of NO2 and HONO were 17.1 and 2.2 ppb, respectively. The average HONO/NO2 ratio was 13.4 ± 3.5% in Ho Chi Minh City, Vietnam.
NO2 and HONO concentrations measured with filter pack sampling and high HONO/NO2 ratio in Ho Chi Minh city, Vietnam
Toriyama, Katsuya (author) / Fukae, Kengo (author) / Suda, Yusuke (author) / Kiyose, Tomofumi (author) / Oda, Takumi (author) / Fujii, Yusuke (author) / Doan Thien Chi, Nguyen (author) / Huu Huy, Duong (author) / Thi Hien, To (author) / Takenaka, Norimichi (author)
Atmospheric Environment ; 214
2019-07-25
Article (Journal)
Electronic Resource
English
Ho Chi Minh City Tower, Ho Chi Minh City, Vietnam
Online Contents | 1997
Ho Chi Minh City Tower, Ho Chi Minh City, Vietnam
British Library Online Contents | 1997