Chemical Composition and Acidity of Precipitation: A Monitoring Program in Northeastern Vietnam

Viet, Pham Hung; Tuan, V. V.; Hoai, Pham Manh; Ánh, Nguyễn Thị Kim; Yen, Po-Hsuan

doi:10.1007/978-94-007-0810-5_97

Cited by 2 publications

(1 citation statement)

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“…A multiple filter-pack method can provide significant information, such as the concentration of chemical species in particulate matter and gaseous compounds including ammonia and nitric acid (Karakas and Tuncel, 1997;Sickles et al, 1999). The determination using filter-pack method has been vigorously conducted all over the world (Mehlmann and Warneck, 1995;Tørseth et al, 1999;Kim et al, 2001;Matsuda et al, 2001;Viet et al, 2001). Continuous monitoring (7 days averages, with semi continuous determination) of the concentration of chemical species in particulate matter and gaseous compounds in ambient air was conducted by a four-stage filter-pack method for three years.…”

Section: Introductionmentioning

confidence: 98%

Characteristics in Concentration of Chemical Species in Ambient Air Based on Three-Year Monitoring by Filter Pack Method

Aikawa

Hiraki

Tamaki

2005

Water Air Soil Pollut

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Continuous monitoring of concentrations of particulate matter and gaseous compounds for three years by a four-stage filter-pack method clarified the characteristics in the concentrations of chemical species in particulate matter and gaseous compounds in ambient air in Kobe, Japan. The amount of materials in blank filters was low enough for this method to be used for the monitoring of ambient air. Little or none of the hydrogen chloride was derived anthropogenically. The concentrations of both particulate sulfate and sulfur dioxide in spring and summer were significantly higher than those in autumn and winter. The concentration of gaseous nitric acid was high in summer, which suggests that active photochemical reactions in the atmosphere provided more nitrogen species in summer. The measured concentration products [HNO 3 ][NH 3 ] showed good agreement with the theoretical predictions with some exceptions. The total concentration of ammonium species showed no significant seasonal variation except that the concentration in winter was low. The concentration of nss-Ca 2+ in spring was significantly higher than that in the other seasons, which is most likely associated with the so-called yellow-sand events. The concentrations of nss-K + and nss-Ca 2+ accounted for most of K + and Ca 2+ , respectively, whereas that of nss-Mg 2+ accounted for only 5% of Mg 2+ .

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