Measurements of gaseous and particulate species in the atmosphere using annular denuder system
Conference
·
OSTI ID:466210
- Nara Prefectural Institute of Public Health (Japan)
- Obirin Univ., Tokyo (Japan)
Combination of annular denuders, and teflon and impregnated filters have been used for the collection and subsequent determination of gaseous SO{sub 2}, HNO{sub 2}, HNO{sub 3}, HCl and NH{sub 3}, and of aerosols SO{sup 2-}{sub 4}, NO{sup -}{sub 3} CL{sup -}, NH{sub 4}{sup +}, NO{sup +}, K{sup +}, Ca{sup 2+}, and Mg{sup 2+} in the atmosphere. The efficiencies of collection of these gaseous and aerosol species by the denuders and filters were examined. The rate of loss of the species on the denuders and filters were also studied. The penetration rate of the species in e denuder tubes were calculated from a theoretical equation. The technique was further applied to the sampling of the species at Nara Prefectural Institute of Public Health, Japan during a period of June 1994 to July 1995. The sampling has been conducted for consecutive five days in a month at sampling flow rate of 5 {ell}/min. The annual mean concentrations of the species were as follows: SO{sub 2}:4.32, HNO{sub 2}:1.46, HNO{sub 3}:1.61, HCl:1.66, NH{sub 3}:2.43, SO{sub 4}{sup 2-}:4.27, NO{sup -}{sub 3}:2.09, CL{sup -} :1.28, NH{sub 4}{sup +} :3.40, Na{sup +}:0.34, K{sup +}:0.32, Ca{sup 2+}:0.22, and Mg{sup 2+}:0.04 ({mu}g/m{sup 3}). Seasonal and variations of the concentrations were clearly observed for SO{sub 2}, HNO{sub 3}, SO{sub 4}{sup 2-} and Cl{sup -} but for other species their seasonal variations were not apparent. The details of the sampling and species concentration data will be presented in the conference.
- OSTI ID:
- 466210
- Report Number(s):
- CONF-9606185--
- Country of Publication:
- United States
- Language:
- English
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