Analysis for sources of atmospheric α- and γ-HCH in gas and particle-associated phase in Dalian, China by multiple regression

Li, Qingbo, Li, Yan, Wang, Xianyu, Zhang, Ruiqi, Ma, Jianmin, Sun, Mengxue, Lv, Xiaoning and Bao, Jiaoling (2015) Analysis for sources of atmospheric α- and γ-HCH in gas and particle-associated phase in Dalian, China by multiple regression. Atmospheric Environment, 114 32-38. doi:10.1016/j.atmosenv.2015.05.025

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Author Li, Qingbo
Li, Yan
Wang, Xianyu
Zhang, Ruiqi
Ma, Jianmin
Sun, Mengxue
Lv, Xiaoning
Bao, Jiaoling
Title Analysis for sources of atmospheric α- and γ-HCH in gas and particle-associated phase in Dalian, China by multiple regression
Journal name Atmospheric Environment   Check publisher's open access policy
ISSN 1873-2844
1352-2310
Publication date 2015-08-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.atmosenv.2015.05.025
Open Access Status
Volume 114
Start page 32
End page 38
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Formatted abstract
Atmospheric concentrations of α- and γ-hexachlorocyclohexanes were measured once a week in Dalian throughout 2008, using a high-volume air sampler, to estimate diurnal, monthly and seasonal variations. Multiple regression analysis was used to estimate the impact of selected meteorological conditions on atmospheric concentrations of hexachlorocyclohexanes and to identify the potential source regions. Overall, α- and γ-hexachlorocyclohexanes were mainly associated with the gas phase, with an annual mean gas-phase concentration of 36±30 and 10±9.8pgm-3 respectively. On the other hand, mean particle (PM10) associated concentrations throughout the year were 1.9±2.4 and 0.46±0.43pgm-3 respectively. Gas-phase concentration of α- and γ-hexachlorocyclohexanes peaked in the autumn season whereas highest concentrations in the particle phase were measured in spring. Ratio of α-/γ-isomer ranged from 3.7 to 7.4 in the gas phase which was close to the ratio in technical hexachlorocyclohexanes (5-7). In the particle-associated phase this ratio ranged from 1.2 to 3.8, with the exception of daytime samples in spring (up to 16) and summer seasons (up to 14) and this exception could be due to the isomerization from γ- to α- in ambient air, at least partly resulted from the impact of sunlight. Regression analysis showed that, at the sampling site, concentrations of α- and γ-hexachlorocyclohexanes in the gas phase were both elevated with increasing temperature and wind speed, whereas in the particle-associated phase their concentrations tended to remain stable.
Keyword Gas phase
Hexachlorocyclohexanes
Multiple regression
Particle-associated phase
Sources
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
National Research Centre for Environmental Toxicology Publications
 
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