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Details for article 7 of 23 found articles
| Title: |
Diffusion Scrubber-Based Field Measurements of Atmospheric Formaldehyde and Hydrogen Peroxide |
| Author: |
Dasgupta, Purnendu K. Dong, Shen Hwang, Hoon |
| Appeared in: |
Aerosol science and technology |
| Paging: | Volume 12 (1990) nr. 1 pages 98-104 |
| Year: |
1990 |
| Contents: |
Field measurements were conducted to determine atmospheric concentrations of HCHO and H2O2 with automated instrumentation that relies on diffusion-based collection of water-soluble gases by an aqueous absorber flowing through a hydrophobic porous membrane tube. These measurements were made as part of the Carbonaceous Species Methods Comparison Study (CSMCS) at Cirrus College, Azusa, CA, during August 12-20, 1986. Both HCHO and H2O2 showed marked diurnal cycles, decreasing at night (to a minimum of 2-4 ppbv for HCHO, and near the detection limit, ∼ 30 pptv for H2O2) and increasing to a maximum in the late afternoon (15-19 ppbv for HCHO, ∼ 2 ppbv for H2O2). For the most part, the instrumentation performed unattended as designed; however, particle deposition in sampling lines and in the membrane-based diffusion scrubbers suggest that in-line losses can be significant for continued sampling of ambient air containing a relatively high concentration of particulate matter. Periodic (e.g., daily or every 2 days) cleaning of all in-line components should be part of any such measurement program. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 7 of 23 found articles
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