Fluorescence of sediment humic substance and its effect on the sorption   of selected endocrine disruptors

doi:10.1016/j.chemosphere.2006.07.078

CORC > 北京大学 > 环境科学与工程学院

	Fluorescence of sediment humic substance and its effect on the sorption of selected endocrine disruptors
	Sun, W. L. ; Ni, J. R. ; Xu, N. ; Sun, L. Y.
刊名	chemosphere
	2007
关键词	sorption fluorescence humic substances endocrine disruptors DISSOLVED ORGANIC-MATTER BLACK CARBON CHEMICAL CHARACTERISTICS SOIL SORPTION SPECTROSCOPY MATRIX PYRENE KEROGEN ESTROGENS ORIGINS
DOI	10.1016/j.chemosphere.2006.07.078
英文摘要	Humic substances (HS) have a critical influence on the sorption of organic contaminants by soils and sediments. This paper describes investigations into the sorption behavior of three representative endocrine disruptors, bisphenol A (BPA), 17 beta-estradiol (E2), and 17 alpha-ethynylestradiol (EE2), onto sediments and HS extracted sediments using a batch technique. The organic carbon-normalized partition coefficients (K-oc) for the extracted HS (K-oc(hs)) were calculated, and the fluorescence spectra of the HS extraced from different sediment samples were gained using excitation/emission matrix (EEM). Particular attention was paid to the correlations between the fluorescence characteristics of HS and the log K-oc(hs) of selected endocrine disruptors. The results show that the log K-oc(hs) values range from 3.14 to 4.09 for BPA, from 3.47 to 4.33 for E2, and from 3.65 to 4.32 for EE2. Two characteristic excitation-emission peaks were observed for HS samples extracted from sediments. They are located at Ex/Em = 250-260 nm/400-450 nm (peak alpha') and Ex/Em = 310-330 nm/390-400 nm (peak alpha) respectively. The alpha' and alpha peak relative intensities (I-alpha'/I-alpha) vzary from 0.46 to 1.64 for different extracted HS samples. The similarity between fulvic acids (FA) Ex/Em pairs and those observed for HS indicates that FA is the predominant fraction of HS extracted from sediments. Moreover, the log K-oc(hs) values of BPA, E2, and EE2 have a negative linear correlation to I-alpha'/I-alpha values. Peak alpha is often attributed to relatively stable and high molecular weight aromatic fulvic-like matter. Therefore, the result presented here reveals that the abundance of aromatic rings in HS molecular structure plays a critical role in the sorption of selected endocrine disruptors. (c) 2006 Elsevier Ltd. All rights reserved.; Environmental Sciences; SCI(E); EI; PubMed; 0; ARTICLE; 4; 700-707; 66
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158996]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Sun, W. L.,Ni, J. R.,Xu, N.,et al. Fluorescence of sediment humic substance and its effect on the sorption of selected endocrine disruptors[J]. chemosphere,2007.
APA	Sun, W. L.,Ni, J. R.,Xu, N.,&Sun, L. Y..(2007).Fluorescence of sediment humic substance and its effect on the sorption of selected endocrine disruptors.chemosphere.
MLA	Sun, W. L.,et al."Fluorescence of sediment humic substance and its effect on the sorption of selected endocrine disruptors".chemosphere (2007).