title: Seasonal characterization and identification of dissolved organic matter (DOM) in the Pearl River, China.
abstract: Dissolved organic matter (DOM) is considered to be one of active organic carbon components in river water, and its characteristics would affect quality of drinking water if such a river is used for the purpose. DOM in the Pearl River around metropolitan Guangzhou and its six fractions obtained by sequential resins separation and their percentage distribution of total organic carbon (TOC), the UV absorbance at 254 nm (UV254), and the specific ultraviolet absorbance (SUVA254) were determined. Meanwhile, fluorescence spectroscopy and Fourier transform infrared (FTIR) spectroscopy were used to examine the biodegradable and structural characteristics of DOM. The results showed that the values of TOC, UV254, and SUVA254 changed with season. Especially, SUVA254 was lower than 3 L (mg m)(-1), indicating that the hydrophilic fractions were the major components of the DOM. Furthermore, fluorescence spectroscopy revealed the dominant presence of humic-like, fulvic-like, and protein-like fluorophores. Fluorescence index (FI) in four seasons was associated with allochthonous DOM sources and biological DOM. FTIR spectroscopy suggested the feature of DOM with some specific groups (e.g., carbohydrate C-O, amid C═O).
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China. lczhengscnu1@163.com.|Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, South China Normal University, Guangzhou, 510006, China. lczhengscnu1@163.com.
authors.forename: Liuchun
authors.initials: L
authors.lastname: Zheng
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China.
authors.forename: Zhaofeng
authors.initials: Z
authors.lastname: Song
authors.affiliation: College of Environment, Jinan University, Guangzhou, 510632, China.
authors.forename: Peipei
authors.initials: P
authors.lastname: Meng
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China. zhqfang@scnu.edu.cn.|Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, South China Normal University, Guangzhou, 510006, China. zhqfang@scnu.edu.cn.
authors.forename: Zhanqiang
authors.initials: Z
authors.lastname: Fang
mesh_terms: D001578:Benzopyrans / Q000032:analysis; D002244:Carbon / Q000032:analysis; D002681:China; D006812:Humic Substances / Q000032:analysis; D045483:Rivers / Q000737:chemistry*; D012621:Seasons; D013050:Spectrometry, Fluorescence / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; D002244:Carbon; C005023:fulvic acid
keywords: Characterization; Dissolved organic matter; Drinking water source; Fractions; The Pearl River