title: Detection of Copper (II) and Cadmium (II) binding to dissolved organic matter from macrophyte decomposition by fluorescence excitation-emission matrix spectra combined with parallel factor analysis.
abstract: Fluorescence excitation-emission matrix (EEM) spectra coupled with parallel factor analysis (PARAFAC) was used to characterize dissolved organic matter (DOM) derived from macrophyte decomposition, and to study its complexation with Cu (II) and Cd (II). Both the protein-like and the humic-like components showed a marked quenching effect by Cu (II). Negligible quenching effects were found for Cd (II) by components 1, 5 and 6. The stability constants and the fraction of the binding fluorophores for humic-like components and Cu (II) can be influenced by macrophyte decomposition of various weight gradients in aquatic plants. Macrophyte decomposition within the scope of the appropriate aquatic phytomass can maximize the stability constant of DOM-metal complexes. A large amount of organic matter was introduced into the aquatic environment by macrophyte decomposition, suggesting that the potential risk of DOM as a carrier of heavy metal contamination in macrophytic lakes should not be ignored.
authors.affiliation: Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
authors.forename: Dong-hai
authors.initials: DH
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Biogas Institute of Ministry of Agriculture, Chengdu 610041, China. Electronic address: gxj530520@126.com.
authors.forename: Xu-jing
authors.initials: XJ
authors.lastname: Guo
authors.affiliation: College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Lian-sheng
authors.initials: LS
authors.lastname: He
authors.affiliation: College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Jing-gang
authors.initials: JG
authors.lastname: Wang
authors.affiliation: Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
authors.forename: Jun-qi
authors.initials: JQ
authors.lastname: Li
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005163:Factor Analysis, Statistical; D006812:Humic Substances / Q000032:analysis*; D060106:Lakes / Q000737:chemistry; D011506:Proteins / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D011506:Proteins; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003300:Copper
keywords: Cadmium; Copper; Dissolved organic matter (DOM); Fluorescence quenching; Macrophyte decomposition; PARAFAC analysis