Characterization of wintertime reactive oxygen species concentrations in Flushing, New York

Prasanna Venkatachari, Philip K. Hopke, William H. Brune, Xinrong Ren, Robert Lesher, Jingqui Mao, Michael Mitchell

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

One of the main hypotheses for the species causing the observed health effects of ambient particulate matter is peroxides and other reactive oxygen species (ROS). However, there is currently very little data available on the concentrations of particle-bound ROS or their behavior in different physical locations and seasons. The concentrations of particle-bound ROS were determined for various size fractions of the aerosol, ranging from 10 nm to 18 μ m, in Flushing, New York during the period of January and early February 2004. Sampling was carried out at 3-hour intervals using a MOUDI™ cascade impactor. The collected particles were treated with the non-fluorescent probe dichlorofluorescin (DCFH) that fluoresces when oxidized by the presence of ROS. The measured fluorescent intensities were converted into equivalent hydrogen peroxide concentrations, which were used as indicators of ROS reactivity, by calibrations using H2O2 standards. Diurnal profiles of the ROS concentrations were obtained. Correlations of the particulate ROS concentrations with the intensity of photochemical reaction, estimated secondary organic carbon (SOC) and gas phase OH and HO2 radical concentrations were explored. The intensity of photochemical reactions and gas phase radical concentrations were found to be moderate factors affecting particulate ROS concentrations. The concentrations of ROS were found to be higher in the submicron size particles of the ambient aerosol.

Original languageEnglish (US)
Pages (from-to)97-111
Number of pages15
JournalAerosol Science and Technology
Volume41
Issue number2
DOIs
StatePublished - Feb 1 2007

Fingerprint

flushing
Reactive Oxygen Species
Oxygen
Photochemical reactions
Aerosols
Gases
aerosol
reactive oxygen species
Particulate Matter
Peroxides
Organic carbon
gas
Hydrogen peroxide
hydrogen peroxide
Hydrogen Peroxide
particulate matter
organic carbon
Particle size
probe
particle size

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

Venkatachari, Prasanna ; Hopke, Philip K. ; Brune, William H. ; Ren, Xinrong ; Lesher, Robert ; Mao, Jingqui ; Mitchell, Michael. / Characterization of wintertime reactive oxygen species concentrations in Flushing, New York. In: Aerosol Science and Technology. 2007 ; Vol. 41, No. 2. pp. 97-111.
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Characterization of wintertime reactive oxygen species concentrations in Flushing, New York. / Venkatachari, Prasanna; Hopke, Philip K.; Brune, William H.; Ren, Xinrong; Lesher, Robert; Mao, Jingqui; Mitchell, Michael.

In: Aerosol Science and Technology, Vol. 41, No. 2, 01.02.2007, p. 97-111.

Research output: Contribution to journalArticle

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