title: The influence of sediment particle size on the properties of adsorbed dissolved organic matter in the Yangtze Estuary and its interactions with As/Sb.
abstract: The characteristics of dissolved organic matter (DOM) extracted from sediments with four particle sizes (<25, 63-25, 200-63 and >200μm) in the Yangtze Estuary were compared. The differences in their binding capacities for individual fluorescent components with As/Sb were studied using fluorescence-quenching titrations combined with excitation-emission matrix (EEM) spectra. The results indicated that the particle size influenced the quality and quantity of extracted DOM. With increasing particle size, the extracted DOM content, value of UV280 and acidic functional group content of the DOM decreased. Three protein-like components (C2, C3 and C4) and one humic-like component (C1) were identified using the parallel factor analysis (PARAFAC) model. Wherein, protein-like material dominated in DOM on different particle-size fractions and possessed a stronger complex capacity with As/Sb. A significant positive correlation between the complexation capacity of extracted DOM from samples, as well as with the acidic functional group content, was observed.
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China. Electronic address: yingwang@bnu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Manman
authors.initials: M
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Zhenyao
authors.initials: Z
authors.lastname: Shen
mesh_terms: D000327:Adsorption; D000965:Antimony / Q000032:analysis*; D001151:Arsenic / Q000032:analysis*; D002681:China; D063366:Estuaries; D005163:Factor Analysis, Statistical; D005453:Fluorescence; D019015:Geologic Sediments / Q000737:chemistry; D006812:Humic Substances / Q000032:analysis*; D010316:Particle Size; D045483:Rivers / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D006812:Humic Substances; D014874:Water Pollutants, Chemical; D000965:Antimony; D001151:Arsenic
keywords: Dissolved organic matter (DOM); Fluorescence excitation–emission matrix quenching with parallel factor analysis (EEM-PARAFAC); Particle size