Seasonal and spatial variation of solvent extractable organic compounds in fine suspended particulate matter in Hong Kong.
J Air Waste Manag Assoc
; 55(3): 291-301, 2005 Mar.
Article
em En
| MEDLINE
| ID: mdl-15828671
The results of a 12-month study of more than 100 solvent extractable organic compounds (SEOC) in particulate matter (PM) less than or equal to 2.5 microm (PM2.5) collected at three air monitoring stations located at roadside, urban, and rural sites in Hong Kong are reported. The total yield of SEOC that accounts for approximately 8-18% of organic carbon (OC) determined by a thermal optical transmittance method was 125-2060 ng/m3, which included 14.6-128 ng/m3 resolved aliphatic hydrocarbons, 39.4-1380 ng/m3 unresolved complex mixtures, 0.6-17.2 ng/m3 polycyclic aromatic hydrocarbons, 41.6-520 ng/m3 fatty acids, and < 0.1-12.1 ng/m3 alkanols. Distinct seasonal variations (summer/winter differences) were observed with higher concentrations of the total and each class of SEOC in the winter and lower concentrations in the summer. Spatial variations are also obvious, with the roadside samples having the highest concentrations of SEOC and the rural samples having the lowest concentrations in all seasons. Characteristic ratios of petroleum hydrocarbons, such as carbon preference index, unresolved to resolved components, and carbon number with maximum concentration, suggest that PM2.5 carbon in Hong Kong originates from both biogenic and anthropogenic sources. The proportion of SEOC in PM2.5 from anthropogenic sources is estimated.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Orgânicos
/
Poluentes Atmosféricos
País/Região como assunto:
Asia
Idioma:
En
Revista:
J Air Waste Manag Assoc
Assunto da revista:
SAUDE AMBIENTAL
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
China