| |
Software Requirements
Microsoft Internet Explorer 5.01 or higher and Netscape Navigator 4.75 or higher are recommended. |
|
 |
J.Health Sci., 50(1), 9-16, 2004
Dioxin Concentration of Particulate and Gaseous
Substances in the Ambient Air by Particle Size - Comparison between Specimens Collected in
Summer and in Winter at Tokyo -
Kazutoshi Sugita,*, a Osamu
Endo,b Shozo
Asada,c Sumio
Goto,d Hirofumi
Yajima,e
and Tadahiro Ishiie
aDia Analysis Service Inc., 8-5-1, Chuo, Ami-machi, Inashiki-gun, Ibaraki 300-0332, Japan,
bNational Institute of Public Health, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8638, Japan,
cJapan Quality Assurance Organization, 1-8-12, Higashi-ohi,
Shinagawa-ku, Tokyo 140-0011, Japan, dNational Institute of Environmental Studies, 16-2, Onogawa, Tsukuba-shi, Ibaraki
305-8506, Japan, and eScience University of Tokyo, Faculty of Science, 1-1, Kagurasaka, Shinjuku-ku, Tokyo 162-0825, Japan
Size-fractionated air-borne particles and gaseous samples were collected using Andersen low pressure
impactor with polyurethane foam at Tokyo. Dioxin concentrations of these particles and gaseous substances were
measured with high resolution gas chromatograph/high resolution mass spectrometer (HRGC/HRMS). Particle
diameter distribution has two peaks, one around
0.7 mu m and the other around 5 mu m both in summer and winter.
But, dioxin has a peak at around the particle diameter of
0.52 mu m. And, It was observed that smaller particle was
the higher weight concentration of dioxins in the particle except in the case of
Tetrachlorodibenzo-p-dioxins tetrachlorodibenzofurans (TeCDFs). From these results, it was recognized that 75% or more of toxic dioxin
component was contained in particles of
1 mu m or smaller.
|
|
