Measurement System for Particulate Nitrate Based on the Scrubber Difference NO−O3 Chemiluminescence Method in Remote Areas

Yuba, Akie; Sadanaga, Yasuhiro; Takami, Akinori; Hatakeyama, Shiro; Takenaka, Norimichi; Bandow, Hiroshi

doi:10.1021/ac101704w

Cited by 20 publications

(10 citation statements)

References 42 publications

(83 reference statements)

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“…Measurement methods for NO x and NO y mixing ratios were developed with an LED converter and a molybdenum converter, respectively, together with commercially available NO x analyzers (model 42 i-TL, Thermo Scientific). These instruments are described in detail elsewhere Yuba et al, 2010). DLs for NO, NO 2 , and NO y were about 0.06 ppbv with 1 min averaging time.…”

Section: Methodsmentioning

confidence: 99%

Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan

et al. 2016

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To better understand the secondary air pollution in transboundary air over westernmost Japan, ground-based field measurements of the chemical composition of fine particulate matter ( ≤ 1 µm), mixing ratios of trace gas species (CO, O 3 , NO x , NO y , i-pentane, toluene, and ethyne), and meteorological elements were conducted with a suite of instrumentation. The CO mixing ratio dependence on wind direction showed that there was no significant influence from primary emission sources near the monitoring site, indicating long-and/or mid-range transport of the measured chemical species. Despite the considerably different atmospheric lifetimes of NO y and CO, these mixing ratios were correlated (r 2 = 0.67). The photochemical age of the pollutants, t[OH] (the reaction time × the mean concentration of OH radical during the atmospheric transport), was calculated from both the NO x / NO y concentration ratio (NO x / NO y clock) and the toluene / ethyne concentration ratio (hydrocarbon clock). It was found that the toluene / ethyne concentration ratio was significantly influenced by dilution with background air containing 0.16 ppbv of ethyne, causing significant bias in the estimation of t [OH]. In contrast, the influence of the reaction of NO x with O 3 , a potentially biasing reaction channel on [NO x ] / [NO y ], was small. The t[OH] values obtained with the NO x / NO y clock ranged from 2.9 × 10 5 to 1.3 × 10 8 h molecule cm −3 and were compared with the fractional contribution of the m/z 44 signal to the total signal in the organic aerosol mass spectra (f 44 , a quantitative oxidation indicator of carboxylic acids) and O 3 mixing ratio. The comparison of t[OH] with f 44 showed evidence for a systematic increase of f 44 as t[OH] increased, an indication of secondary organic aerosol (SOA) formation. To a first approximation, the f 44 increase rate was (1.05 ± 0.03) × 10 −9 × [OH] h −1 , which is comparable to the background-corrected increase rate observed during the New England Air Quality Study in summer 2002. The similarity may imply the production of similar SOA component, possibly humic-like substances. Meanwhile, the comparison of t[OH] with O 3 mixing ratio showed that there was a strong proportional relationship between O 3 mixing ratio and t [OH]. A first approximation gave the increasing rate and background mixing ratio of ozone as (3.48 ± 0.06) × 10 −7 × [OH] ppbv h −1 and 30.7 ppbv, respectively. The information given here can be used for prediction of secondary pollution magnitude in the outflow from the Asian continent. Published by CopernicusPublications on behalf of the European Geosciences Union. 4556 S. Irei et al.: Photochemical age of air pollutants Atmos. Chem. Phys., 16, 4555-4568, 2016 www.atmos-chem-phys.net/16/4555/2016/

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Section: Methodsmentioning

confidence: 99%

Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan

et al. 2016

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“…NO x and NO y analyzers with an LED converter and a molybdenum converter, respectively, were developed from commercially available NO x analyzers (Model 42 i-TL, Thermo Scientific). These instruments are described in detail elsewhere Yuba et al, 2010). DLs for both instruments were about 0.06 ppbv.…”

Section: Methodsmentioning

confidence: 99%

Photochemical age of air pollutants and oxidation products in transboundary air observed on Fukue Island, Nagasaki, Japan

Irei

Takami

Sadanaga

et al. 2016

Preprint

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Abstract. To better understand the secondary air pollution in transboundary air over westernmost Japan, ground-based field measurements of the chemical composition of fine particulate matter (&#8804; 1 &#956;m), mixing ratios of trace gases species (CO, O3, NOx, NOy, i-pentane, toluene, and ethyne), and meteorological elements were conducted with a suite of instrumentation. The CO mixing ratio dependence on wind direction showed that there was no notable influence from primary emission sources near the monitoring site, indicating long- and/or mid-range transport of the measured chemical species. Despite the considerably different atmospheric lifetimes of NOy and CO, these mixing ratios were correlated (r2 = 0.67), suggesting negligible loss of NOy by the reaction with OH radical. The photochemical age of the pollutants, t[OH], was calculated from both the NOx / NOy concentration ratio (NOx / NOy clock) and the toluene/ethyne concentration ratio (hydrocarbon clock). It was found that the toluene/ethyne concentration ratio was significantly influenced by dilution with background air containing 0.16 ppbv of ethyne, causing significant bias in the estimation of t[OH]. In contrast, the influence of the reaction of NOx with O3, a potentially biasing reaction channel on [NOx] / [NOy], was small. The t[OH] values obtained with the NOx / NOy clock were compared with the fractional contribution of the m/z 44 signal to the total signal in the organic aerosol mass spectra (f44, a quantitative oxidation indicator of carboxylic acids), and the comparison showed evidence for a systematic increase of f44 as t[OH] increased. To a first approximation, the f44 increase rate was 1.05 &#215; 10&#8722;9 h&#8722;1 molecule&#8722;1 cm3, which is comparable to the background-corrected increase rate observed during the New England Air Quality Study in summer 2002.

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“…In order to avoid the adsorption of NO y species, such as gaseous nitric acid, onto the surface of the tubing, the converter was installed on the ceiling of the aircraft, just after the backward air inlet on the ceiling of the aircraft, and heated to 530°C. The main uncertainty of the NO y concentration arises from the NO calibration of the O 3 chemiluminescent detector (± 10%) Yuba et al, 2010). The precision of the NO y analyzer was estimated to be within ± 2% (1σ) .…”

Section: Species Observedmentioning

confidence: 99%

Aerial Observation of Aerosols Transported from East Asia — Chemical Composition of Aerosols and Layered Structure of an Air Mass over the East China Sea

Hatakeyama

Hanaoka

Ikeda

et al. 2011

Aerosol Air Qual. Res.

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ABSTRACT2-]) ratio value, which increased from north to south along the aircraft flight track, indicated oxidation of SO 2 to form sulfuric acid during transport. In addition, pronounced chlorine loss suggested that substantial production of acidic substances occurred in the air mass as it moved away from China. The negative correlation between the Cl -/Na + ratio and the nss-sulfate concentration suggested that the reaction of sulfuric acid with sea salt was the main cause of the strong chlorine loss. On 28 March a very clear layered structure of the air mass was observed that could be clearly explained by the CFORS computer simulation model. Therefore, here the observation results obtained on 28 March 2008 are reported.

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Measurement System for Particulate Nitrate Based on the Scrubber Difference NO−O₃ Chemiluminescence Method in Remote Areas

Cited by 20 publications

References 42 publications

Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan

Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan

Photochemical age of air pollutants and oxidation products in transboundary air observed on Fukue Island, Nagasaki, Japan

Aerial Observation of Aerosols Transported from East Asia — Chemical Composition of Aerosols and Layered Structure of an Air Mass over the East China Sea

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