东海海水和大气中挥发性卤代烃的分布

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Abstract The concentrations, sources and sea-to-air fluxes of five short-lived volatile halocarbons of the East China Sea were studied by Purge and Trap-Chromatography during June 2016. The results showed that the mean (range) concentrations of CH₃I, CH₂Br₂, CHBrCl₂, CHBr₂Cl and CHBr₃ in the surface sea water were 8.93 (0.39~23.49) pmol/L, 15.02 (4.77~32.75) pmol/L, 0.97 (0.30~2.16) pmol/L, 9.35 (6.8~18.46) pmol/L and 12.24 (2.60~50.04) pmol/L, respectively. The distributions of CH₃I, CH₂Br₂ and CHBrCl₂ in the surface seawater displayed a decreasing trend from inshore to offshore, while the distributions of CHBr₂Cl and CHBr₃ exhibited strong patchiness. The distributions of these gases were significantly influenced by terrestrial input, the mixed water mass and biological activity in spring. Significant correlation was observed between CHBr₃ and Chl-a concentrations in the surface seawater, indicating that phytoplankton biomass might play a significant role in the distribution of CHBr₃. The mean (range) atmospheric mixing ratios of CH₃I, CH₂Br₂, CHBrCl₂, CHBr₂Cl and CHBr₃ were 3.52×10^-12 (1.72×10^-12~10.00×10^-12), 3.82×10^-12(0.20×10^-12~34.95×10^-12), 1.40×10^-12(0.46×10^-12~6.18×10^-12), 1.55×10^-12 (0.16×10^-12~4.66×10^-12) and 6.63×10^-12 (2.20×10^-12~11.61×10^-12), respectively. The distribution patterns of atmospheric five short-lived volatile halocarbons were complex and affected by long-range transportation of air mass and meteorological condition. The sea-to-air flux data indicated that the entire East China Sea acted as a source for atmospheric CH₃I, CH₂Br₂, CHBrCl₂, CHBr₂Cl and CHBr₃ during the study period.

Key words： volatile halocarbons distribution atmosphere sea-to-air flux East China Sea

Received: 15 May 2017

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X834

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	ZHANG Ying-jie
	HE Zhen
	YANG Gui-peng

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ZHANG Ying-jie,HE Zhen,YANG Gui-peng. Distribution characteristics of volatile halocarbons in seawater and atmosphere of the East China Sea[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 14-25.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2018/V38/I1/14

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