Photochemical formation of peroxides and fluorescence characteristics of the water-soluble fraction of bulk aerosols collected in Okinawa, Japan

Nakajima, Hitomi; Okada, Kouichirou; Kuroki, Y.; Nakama, Y.; Handa, D.; Arakaki, Takemitsu; Tanahara, Akira

doi:10.1016/j.atmosenv.2007.12.045

Cited by 22 publications

(7 citation statements)

References 35 publications

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“…Many studies have suggested that the optical properties of chromophoric WSOC in the atmosphere may be similar to CDOM in aquatic environments 18 19 . Furthermore, fluorescence techniques have been used to study photo-degradation effects on CDOM in rainwater 20 and WSOC in aerosol particles 11 19 21 22 23 . During the past few years, on-line fluorescence instruments, such as the ultraviolet aerodynamic particle sizer (UV-APS) and the wideband integrated bioaerosol sensor (WIBS) have been successfully used to measure emission spectra of single bioaerosol particles in ambient air 24 25 .…”

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confidence: 99%

Fluorescent water-soluble organic aerosols in the High Arctic atmosphere

Kawamura

Chen

et al. 2015

Sci Rep

119

127

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Organic aerosols are ubiquitous in the earth’s atmosphere. They have been extensively studied in urban, rural and marine environments. However, little is known about the fluorescence properties of water-soluble organic carbon (WSOC) or their transport to and distribution in the polar regions. Here, we present evidence that fluorescent WSOC is a substantial component of High Arctic aerosols. The ratios of fluorescence intensity of protein-like peak to humic-like peak generally increased from dark winter to early summer, indicating an enhanced contribution of protein-like organics from the ocean to Arctic aerosols after the polar sunrise. Such a seasonal pattern is in agreement with an increase of stable carbon isotope ratios of total carbon (δ13CTC) from −26.8‰ to −22.5‰. Our results suggest that Arctic aerosols are derived from a combination of the long-range transport of terrestrial organics and local sea-to-air emission of marine organics, with an estimated contribution from the latter of 8.7–77% (mean 45%).

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confidence: 99%

Fluorescent water-soluble organic aerosols in the High Arctic atmosphere

Kawamura

Chen

et al. 2015

Sci Rep

119

127

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“…Previous study has shown that during photo-degradation of naphthalene [34], tannic acid and gallic acid [35] in an aqueous solution, the production of H 2 O 2 was also observed. In freshwater, marine and atmospheric environments, H 2 O 2 has been shown to form from the interaction of sunlight and light-absorbing substances [36][37][38]. Fig.…”

Section: Formation Of Hydrogen Peroxide During the Processmentioning

confidence: 99%

Photodecomposition of 4-chlorophenol by reactive oxygen species in UV/air system

et al. 2011

Journal of Hazardous Materials

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“…The daily actinic flux was determined by chemical actinometry using 2-nitrobenzaldehyde (2-NB). The 2-NB in Milli-Q water was analyzed by HPLC using an eluent of 50% CH 3 CN/50% H 2 O, a flow rate of 1 ml min −1 , and the detection of absorbance at 260 nm (series 1050; Hewlett Packard, Palo Alto, CA, USA) (Anastasio et al 1994;Arakaki and Faust 1998;Nakajima et al 2008). The mean actinic flux (volume averaged) value was 2.6µE l −1 s −1 for our monochromatic illumination system.…”

Section: Photochemical Equipmentmentioning

confidence: 99%

Photochemical Formation of Hydroxyl Radicals in Red Soil-Polluted Seawater on the North of Okinawa Island, Japan

Arakaki

Hamdun

Uehara

et al. 2009

Water Air Soil Pollut

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Land development has caused runoff of red soil into the ocean on the north side of Okinawa Island, Japan. In an attempt to clarify the impacts of this "red soil pollution" on the oxidizing power of seawater, we studied the formation of hydroxyl radical (•OH), the most potent oxidant in the environment, in red soil-polluted waters using a 313-nm monochromatic light. •OH was photochemically formed in the red soil-polluted water samples, and the formation rates of •OH decreased as salinity increased, i.e., as red soil-polluted river water gets mixed with seawater. The photo-formation rates of •OH showed good correlations with dissolved Fe concentrations (R 2 =0.96) and [NO 2 − ]+[NO 3 − ] concentrations (R 2 =0.87), while a negative and weak correlation was found with dissolved organic carbon concentrations (R=−0.78). Theoretical calculation showed that direct photolysis of NO 3 − , Fe(OH) 2+ , and hydrogen peroxide all together accounted for less than 10% of the observed •OH formation in the red soil-polluted waters. Comparison between filtered and unfiltered samples showed that red soil particles were not the main sources of •OH, and the photolysis of NO 2 − could account for at most 78% of the observed •OH formation rates. We found that the Fenton's reaction (a reaction between Fe(II) and H 2 O 2 ) could possibly account for the observed formation of •OH in the red soil-polluted waters.

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Photochemical formation of peroxides and fluorescence characteristics of the water-soluble fraction of bulk aerosols collected in Okinawa, Japan

Cited by 22 publications

References 35 publications

Fluorescent water-soluble organic aerosols in the High Arctic atmosphere

Fluorescent water-soluble organic aerosols in the High Arctic atmosphere

Photodecomposition of 4-chlorophenol by reactive oxygen species in UV/air system

Photochemical Formation of Hydroxyl Radicals in Red Soil-Polluted Seawater on the North of Okinawa Island, Japan

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