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《Environmental Science & Technology》 2017-02
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Ultraviolet-Visible and Fluorescence Characteristics of Dissolved Organic Matter in the Fallen Leaves of Populus tomentosa

ZHAO Li;WANG Changyuan;YANG Zhibin;ZHEN Xiaoge;School of Resource & Environmental Engineering,Henan Polytechnic University;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region;Jiaozuo Environmental Monitoring Station;Xi'an Research Institute,CCTEG;  
To study the structure and type of dissolved organic matter extracted from the fallen leaves of Populus tomentosa,which are widely grown in the geothermal water recharge area in the plain of East Henan,experiments were carried out firstly to determine the optical time of extracting dissolved organic matter(DOM) from the fallen leaves of Populus tomentosa.Then the UV-Vis and three-dimensional fluorescence spectrum of DOM were measured,after which the parameters of SUVA_(254),A_(253)/A_(203),A_(250)/A_(365) and r_(A/C) were calculated.The results showed that it is better to extract DOM from the fallen leaves of Populus tomentosa after oscillating for 24 h.DOC is highly linearly correlated with UV_(254)indicated by the regression coefficient(R~2=0.92) for the studied DOM sample,suggesting that many simple aromatic compounds containing benzene ring exist in the studied DOM and many kinds of aromatic ring substituents contain carbonyl,carboxyl,hydroxyl and lipids.Totally 4 types of fluorescence peak appear in the studied DOM,and the fluorescence intensity in the descending order are humic-like peak(including fulvic-like peak A and humic substances peak C in ultraviolet region),tyrosine aromatic protein peak T and soluble microbial metabolites peak B.At different dilution conditions of DOM samples,the validated structure and relative content of dissolved organic matter with fluorescent properties are slightly different,which are related with the factors such as the pH change of DOM samples,complex composition and disturbance of mixed fluorescent signal.
【Fund】: 国家自然科学基金项目(41402216);; 河南理工大学博士基金项目
【CateGory Index】: S792.117
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【Citations】
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