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J.Health Sci., 50(1), 86-91, 2004
Trend in Lead Content of Airborne Particles and Mass of
PM10 in the Metropolitan Bangkok
Voravit Cheevaporn,*, a Poonsup
Norramit,b and Keiichi
Tanakac
aGraduate Program in Environmental Science , Burapha University, Bangsaen, Chonburi 20131, Thailand,
bEnvironmental Impact Evaluation Division, Office of Environmental Policy and Planning, Bangkok 10400, Thailand, and
cLaboratory of Toxicology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan
This research investigated lead in airborne particles smaller than or equal to ten micrometer (PM10) in
diameter and mass of PM10 in the Bangkok Metropolitan Area. One hundred and thirty two samples were
collected by standard high volume technique from the Bangkok Metropolitan Area during 1999-2000, filtered
and measured for lead by flameless atomic absorption spectrophotometry. Concentration of lead in air particles
(24 hr average) was 73.22 ng/m3 considerably less than the Thai ambient air quality standard value of
1500 ng/m3. Highest and lowest concentrations, 299.38 and
2.96 ng/m3 were found in Yoawarach road and Phahonyotin
road, respectively. This and previous studies indicate a reduction in the concentration of lead in airborne
particles since the 1991 campaign to use unleaded gasoline. The results of the study also showed a significant
correlation between lead contents and mass of PM10. However, no correlation was observed between the
concentration of lead in airborne particles and traffic density. This is probably due to the banning of leaded gasoline
throughout the country since 1996 so that lead emissions and subsequent elimination of lead emissions via the
exhaust system of vehicle is no longer an issue.
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