不同波段下黄海中二甲基硫光氧化动力学研究

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Abstract

The surface seawater samples in the Yellow Sea were collected to study the photochemical oxidation behaviors of dimethylsulfide (DMS) under UVB (280, 295 and 305nm) UVA (320, 345 and 395nm) and visible lights (435 and 495nm) in simulated sunlight conditions. The production ratios of dimethylsulfoxide (DMSO) were also discussed. The results indicated that the photooxidation reaction of DMS exhibited first-order reaction kinetic behavior equation, and the rate constants under UVB, UVA and visible lights were 2.71~5.52, 2.23~4.09 and 1.55~2.65d^-1, respectively. In the same sample, the photooxidation rates of DMS under UVB were higher than those under UVA and visible lights, with the maximum rate at 280nm. The negative correlations were found between DMS concentrations and the spectral absorption coefficients (α(355)) of chromophoric dissolved organic matter (CDOM) under the 8 different wavelengths, suggesting that light absorption characteristics of CDOM might significantly affect the photochemical behaviors of DMS. In addition, the transfer ratios of DMS photooxidation into DMSO ranged from 20.0% to 31.9% under the 8 different wavelengths, with the maximum at 280nm.

Key words： dimethylsulfide wavelength photochemical kinetic chromophoric dissolved organic matter dimethylsulfoxide

Received: 10 June 2015

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X55

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	Articles by authors
	JIN Na
	LIU Xin-wei
	SONG Yu-chen
	LI Jian-long
	ZHANG Hong-hai
	YANG Gui-peng

Cite this article:

JIN Na,LIU Xin-wei,SONG Yu-chen等. Photochemical kinetics of seawater dimethylsulfide in the Yellow Sea under different wavelengths[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(1): 167-174.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I1/167

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