Citation:

Hasson, A. S. AND S. E. Paulson. AN INVESTIGATION OF THE RELATIONSHIP BETWEEN GAS-PHASE AND AEROSOL-BORNE HYDROPEROXIDES IN URBAN AIR. (R827352). JOURNAL OF AEROSOL SCIENCE 34(4):459-468, (2003).

Description:

Simultaneous measurements of hydroperoxides in both the gas- and the aerosol-phase have been made for the first time. In addition, hydroperoxide levels in the ‘coarse’ (>PM₂) and ‘fine’ (PM₂) aerosol modes have been characterized. Hydrogen peroxide (H₂O₂) was found to be the major hydroperoxide present, with trace amounts of methyl hydroperoxide (CH₃OOH,MHP) occasionally being observed. Between May and August 2001, ambient gas- and aerosol-phase hydroperoxide levels were in the range 0.5–3.5 ppbv, and 0–13 ngm⁻³, respectively. On average, about 40% of aerosol-phase H₂O₂ was associated with fine particles. The observed aerosol mass loadings correspond to aqueous concentrations of 10⁻⁴–10⁻³ M, above the levels necessary to induce lung epithelial cell damage in laboratory studies. The measured H₂O₂ mass loadings were found to be several times larger than could be explained by the solubility of gaseous H₂O₂ in liquid water. Potential reasons for this discrepancy are briefly discussed.

Author Keywords: Urban aerosol; Air pollution; Toxicity

Record Details:

Record Type:DOCUMENT( JOURNAL/ PEER REVIEWED JOURNAL)

Product Published Date:01/01/2003

Record Last Revised:12/22/2005

Record ID: 113629

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Document IDs:

EPA Number :R827352