Atmospheric Environment

1998

DOI: 10.1016/s1352-2310(97)00270-7

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Long term measurements of atmospheric gaseous and aerosol species using an annular denuder system in Nara, Japan

Mitsuhiro Matsumoto

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Toshiichi Ôkita²

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Introduction2

Loss Aerosols From Collecting Filters1

Comparison With Annular Denuder Methods At An Urban Site1

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Cited by 90 publications

(52 citation statements)

References 14 publications

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“…4 shows that these losses can be explained by the loss of NH 4 NO 3 + NH 4 Cl aerosol from the Teflon filters. Similar findings were reported elsewhere (Matsumoto and Okita, 1998).…”

Section: Loss Aerosols From Collecting Filterssupporting

confidence: 93%

Comparison of Filtration System and a Honeycomb Denuder-Based System for Sampling PM2.5 in Tianjin, China

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et al. 2015

Aerosol Air Qual. Res.

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To evaluate sampling artifacts of PM 2.5 with conventional filtration system (FS), a contrastive study between the FS and a honeycomb denuder system (HDS) in measuring atmospheric concentrations of PM 2.5 and its main water-soluble ions (Cl -, NO 3 -, SO 4 2-and NH 4 + ) was conducted at a urban site in Tianjin, China in both summer and winter. In this study, we confirmed the optimum concentration of absorbents of Na 2 CO 3 and citric acid for HDS were 3% and 6% in summer experiments and 4% and 5% in winter experiments. Daily mean concentrations of Cl -obtained by HDS were higher than those by FS both in summer and winter. In contrast, the HDS gave lower daily mean SO 4 2-concentrations than FS in both summer and winter. For NO 3 -and NH 4 + , concentrations obtained by HDS were lower than those obtained by FS in winter. However, the HDS gave larger values of NO 3 -and NH 4 + than FS in summer. The different results of different ions were in response to the concentrations of interfering gases in ambient air and chemical characteristics of ionic species. In addition, the concentrations of PM 2.5 obtained by HDS were higher than those obtained by FS in summer, while virtually no significant difference between HDS and FS in winter. Our study points out that investigating optimum concentrations of coating solutions before denuder system sampling is necessary. Moreover, it is essential to make careful evaluation and modification when applying FS in highly polluted Environment, especially for PM 2.5 ions determining.

“…4 shows that these losses can be explained by the loss of NH 4 NO 3 + NH 4 Cl aerosol from the Teflon filters. Similar findings were reported elsewhere (Matsumoto and Okita, 1998).…”

Section: Loss Aerosols From Collecting Filterssupporting

confidence: 93%

Comparison of Filtration System and a Honeycomb Denuder-Based System for Sampling PM2.5 in Tianjin, China

¹

,

²

,

³

et al. 2015

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

To evaluate sampling artifacts of PM 2.5 with conventional filtration system (FS), a contrastive study between the FS and a honeycomb denuder system (HDS) in measuring atmospheric concentrations of PM 2.5 and its main water-soluble ions (Cl -, NO 3 -, SO 4 2-and NH 4 + ) was conducted at a urban site in Tianjin, China in both summer and winter. In this study, we confirmed the optimum concentration of absorbents of Na 2 CO 3 and citric acid for HDS were 3% and 6% in summer experiments and 4% and 5% in winter experiments. Daily mean concentrations of Cl -obtained by HDS were higher than those by FS both in summer and winter. In contrast, the HDS gave lower daily mean SO 4 2-concentrations than FS in both summer and winter. For NO 3 -and NH 4 + , concentrations obtained by HDS were lower than those obtained by FS in winter. However, the HDS gave larger values of NO 3 -and NH 4 + than FS in summer. The different results of different ions were in response to the concentrations of interfering gases in ambient air and chemical characteristics of ionic species. In addition, the concentrations of PM 2.5 obtained by HDS were higher than those obtained by FS in summer, while virtually no significant difference between HDS and FS in winter. Our study points out that investigating optimum concentrations of coating solutions before denuder system sampling is necessary. Moreover, it is essential to make careful evaluation and modification when applying FS in highly polluted Environment, especially for PM 2.5 ions determining.

“…Traditional techniques employ passive samplers such as annular diffusion denuders with off-line analysis such as ion chromatography (Hoek et al, 1996;Burkhardt et al, 1998;Matsumoto and Okita, 1998;Erisman et al, 2001;Olszyna et al, 2005;Smith et al, 2007). Drawbacks of these methods often include low time resolution, poor sensitivity, and human-induced errors.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric ammonia measurements in Houston, TX using an external-cavity quantum cascade laser-based sensor

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et al. 2011

Atmos. Chem. Phys.

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Abstract. In order to improve the current understanding of the dynamics of ammonia (NH 3 ) in a major industrial and urban area, intensive measurements of atmospheric NH 3 were conducted in Houston during two sampling periods (12 February 2010-1 March 2010 and 5 August 2010-25 September 2010). The measurements were performed with a 10.4-µm external cavity quantum cascade laser (EC-QCL)-based sensor employing conventional photo-acoustic spectroscopy. The mixing ratio of NH 3 ranged from 0.1 to 8.7 ppb with a mean of 2.4 ± 1.2 ppb in winter and ranged from 0.2 to 27.1 ppb with a mean of 3.1 ± 2.9 ppb in summer. The larger levels in summer probably are due to higher ambient temperature. A notable morning increase and a mid-day decrease were observed in the diurnal profile of NH 3 mixing ratios. Motor vehicles were found to be major contributors to the elevated levels during morning rush hours in winter. However, changes in vehicular catalytic converter performance and other local or regional emission sources from different wind directions governed the behavior of NH 3 during morning rush hours in summer. There was a large amount of variability, particularly in summer, with several episodes of elevated NH 3 mixing ratios that could be linked to industrial facilities. A considerable discrepancy in NH 3 mixing ratios existed between weekdays and weekends. This study suggests that NH 3 mixing ratios in Houston occasionally exceeded previous modeling predictions when sporadic and substantial enhancements occurred, potentially causing profound effects on particulate matter formation and local air quality.

“…ZG1 (HP), high-pressure zero-gas supply; ZG2 (LP), low-pressure zero-gas supply; PR, pressure regulator; PG, pressure gage; MFC, mass flow controller; Or, micro orifice; BPR, back-pressure regulator; DG, diluted gas port (DG1 for higher concentrations at several tens of ppbv levels and DG2 for lower concentrations at sub-ppbv levels). configurations used in Matsumoto and Okita (1998). The annular denuder system consists of a cyclone separator (2000-30EH; URG Corp.) cutting particles larger than 2.5 μm in diameter, an annular denuder (28 mm OD × 242 mm length, -2000-30x242-3CSS; URG Corp.) coated with 2% oxalic acid in methanol and glycerol for collecting NH 3 , a PTFE filter (nominal pore size, 1.0 μm; filter size, 47 mm diameter; Advantec Toyo Kaisha Ltd.) for collecting aerosol particles, and a backup oxalic acid impregnated filter (impregnated 300 μL of 0.01M oxalic acid in a 16/84 glycerol/methanol solution by volume, 47 mm diameter) for collecting gaseous NH 3 evaporated from particles on the PTFE filter.…”

Section: Comparison With Annular Denuder Methods At An Urban Sitementioning

confidence: 99%

Measurements of Gaseous NH3 and Particulate NH4+ in the Atmosphere by Fluorescent Detection after Continuous Air-water Droplet Sampling

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et al. 2011

Aerosol Air Qual. Res.

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Phase partitioning of NH x (gaseous NH 3 and particulate NH 4 + ) in the atmosphere is crucial for the lifetime of NH x during atmospheric transport. Reliable data for gaseous NH 3 and NH 4 + in aerosols are necessary to understand phasepartitioning and atmospheric cycles of NH x . A semi-continuous microflow analytical system (MF system) was developed for measuring gaseous NH 3 and particulate NH 4 + in the atmosphere. Two inlet lines were used to differentiate total amounts of NH x and particulate NH 4 + after gaseous NH 3 were removed by phosphoric acid coated denuder from the sample air stream. Small water droplets were mixed with sample air and separated for liquid phase analysis in the MF system. The NH 4 + concentration in the liquid was measured using sensitive fluorescence detection after reaction with ophthalaldehyde and sulfite. Based on air sampling at a flow rate of 1 L/min with stripping water at a flow rate of 100 μL/min, the MF system can analyze down to 3 nmol/m 3 of atmospheric NH 3 concentration at 15 min intervals. Comparison with data based on the annular denuder method for gaseous NH 3 and particulate NH 4 + concentrations indicated reasonable agreement with the MF system. Field tests of the MF system for one month showed good agreement with NH 4 + concentrations of fine particles collected daily on PTFE filters at the site. The MF system can monitor gaseous NH 3 and particulate NH 4 + concentrations at 30 min intervals, thereby providing short-term phase partitioning data of NH x .

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