Atmospheric Concentrations of Sulfur Dioxide, Nitrogen Oxides, Ammonia, Hydrogen Chloride, Nitric Acid, Formic and Acetic Acids in the South of Vietnam Measured by the Passive Sampling Method

Lân, Trần Đình; Nishimura, Rokuro; Tsujino, Yoshio; Imamura, Kiyoshi; Warashina, Munehiro; Hoang, Nguyen Huy; Maeda, Yasuhiro

doi:10.2116/analsci.20.213

Cited by 19 publications

(10 citation statements)

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“…They generally rely on diffusion of contaminant molecules across concentration gradients defined by Fick’s first law of diffusion. Diffused contaminants are trapped on filters impregnated with reagents consisted of NaOH, triethanolamine, Na 2 CO 3 , tetrachloro-mercurate, TEA, NaI + Na 2 CO 3 , citric acid, or phosphoric acid for trapping SO 2 , NO 2 , or NH 3 (Lan et al 2004 ).…”

Section: Introductionmentioning

confidence: 99%

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Salem

Soliman

Elhaty

2009

Air Qual Atmos Health

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Concentrations of nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), ozone (O 3 ), and ammonia (NH 3 ) were determined in the ambient air of Al-Ain city over a year using the passive sampling method associated with ion chromatographic and potentiometric detections. IVL samplers were used for collecting nitrogen and sulfur dioxides whereas Ogawa samplers were used for collecting ozone and ammonia. Five sites representing the industrial, traffic, commercial, residential, and background regions of the city were monitored in the course of this investigation. Year average concentrations of ≤59.26, 15.15, 17.03, and 11.88 μg/m 3 were obtained for NO 2 , SO 2 , O 3 , and NH 3 , respectively. These values are lower than the maxima recommended for ambient air quality standards by the local environmental agency and the world health organization. Results obtained were correlated with the three meteorological parameters: humidity, wind speed, and temperature recorded during the same period of time using the paired t test, probability p values, and correlation coefficients. Humidity and wind speed showed insignificant effects on NO 2 , SO 2 , O 3 , and NH 3 concentrations at 95% confidence level. Temperature showed insignificant effects on the concentrations of NO 2 and NH 3 while significant effects on SO 2 and O 3 were observed. Nonlinear correlations (R 2 ≤ 0.722) were obtained for the changes in measured concentrations with changes in the three meteorological parameters. Passive samplers were shown to be not only precise (RSD≤13.57) but also of low cost, low technical demand, and expediency in monitoring different locations.

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Section: Introductionmentioning

confidence: 99%

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Salem

Soliman

Elhaty

2009

Air Qual Atmos Health

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“…Since 1986, the economy of Vietnam has shown rapid growth due to the Doi Moi reforms that introduced free market economics to the previously socialistic country. The resulting industrialization has been accompanied by a dramatic increase in the number of motorcycles in urban areas, leading to concerns regarding air pollution in the form of PM, nitrogen oxide (NO x ), sulfur oxide (SO x ), and volatile organic compounds (VOCs) (Lan et al 2004). Hien et al (2007a, b) studied particulate PAHs in an urban area in Vietnam; however, gaseous-phase PAHs have yet to be investigated in this country.…”

mentioning

confidence: 99%

Concentrations of Atmospheric Polycyclic Aromatic Hydrocarbons in Particulate Matter and the Gaseous Phase at Roadside Sites in Hanoi, Vietnam

Kishida

Imamura

Takenaka

et al. 2008

Bull Environ Contam Toxicol

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We analyzed the concentrations of polycyclic aromatic hydrocarbons (PAHs) in both particulate matter (PM) and the gaseous phase at 10 roadside sites in Hanoi, Vietnam. The average concentrations of 47 PAHs ( summation 47PAHs) were 63 +/- 82 ng m(-3) in PM and 480 +/- 300 ng m(-3) in the gaseous phase. The PAHs mainly originated from motorcycles without catalytic converters. The highest concentrations of summation 47PAHs in both PM and the gaseous phase were observed at a terminal for buses and trucks. The operation of large commercial vehicles led to increased PAH pollution at the terminal site.

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“…Generic diffusion passive samplers have been successfully employed for limited durations to determine outside concentrations of HNO3 (Lan et al, 2004). In addition, Bytnerowicz et al…”

mentioning

confidence: 99%

“…Passive samplers have been employed recently to determine outside concentrations of HNO3 (Lan et al, 2004 The impregnating agent and filter type depend on the contaminant, and in the case of HNO3, a NaCl and glycerin aqueous reagent solution is used on a cellulose filter (Lan et al, 2004). Once exposed for durations of up to one month, the collected HNO3 is extracted using water and analyzed as NO3".…”

mentioning

confidence: 99%

“…The concentration of HNO3 in air is estimated knowing the amount of gas collected on the filter, exposure time, and a conversion coefficient. The conversion coefficient is established by measuring the concentration of HNO3 in the same area over the same duration using a filter pack (Lan et al, 2004 (Bytnerowicz et al, 2001). The sampler is based on diffusion of ambient air through a Teflon membrane and absorption of pollutants on a Nylasorb nylon filter.…”

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confidence: 99%

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Review and assessment of methods for monitoring and estimating dry deposition in Alberta

Alberta.¹

2005

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Acid deposition occurs when acidifying pollutants emitted from anthropogenic and other processes undergo chemical reactions in the atmosphere and fall to the earth as wet deposition (rain, snow, cloud, fog) or dry deposition (dry particles, gas). Acidic pollutants can be transported long distances in the atmosphere from their sources and eventually be deposited in ecosystems over broad regional scales and in locations far from the emission sources. Dry deposition is generally more a local problem than wet deposition. Direct measurement of dry deposition rates is difficult. Dry deposition depends on many factors, including: meteorological conditions, characteristics of the pollutants being deposited (e.g. different gaseous chemical and particle size), and characteristics of the surface on which deposition occurs. The most accepted and common method for estimating dry deposition is the so-called "inference method." The inferential method is a combination of measurement and modeling that involves indirect estimation of dry deposition rates on the basis of routinely measured air concentrations and meteorological parameters. The method is based on an assumed steady-state relationship F = Vd C, where the dry deposition flux or rate (F) is a product of the dry deposition velocity (Vd) and the concentration (C) of an airborne pollutant. A series of studies have been initiated by AENV to evaluate the inference method and search for the most suitable and simple model for deposition rate estimations in Alberta. This report documents the first study in the series. Titles for the reports of the other studies are: "Dry Deposition Monitoring Method in Alberta", and "Refinement Study of Dry Deposition Inference Method Used in Alberta ". It is anticipated that once all necessary information is gathered, an Alberta protocol for dry deposition measurement will be prepared.

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Atmospheric Concentrations of Sulfur Dioxide, Nitrogen Oxides, Ammonia, Hydrogen Chloride, Nitric Acid, Formic and Acetic Acids in the South of Vietnam Measured by the Passive Sampling Method

Cited by 19 publications

References 3 publications

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Concentrations of Atmospheric Polycyclic Aromatic Hydrocarbons in Particulate Matter and the Gaseous Phase at Roadside Sites in Hanoi, Vietnam

Review and assessment of methods for monitoring and estimating dry deposition in Alberta

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