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

• Published in: Environmental pollution (1987) Vol. 204; pp. 152 - 160
• Main Authors: Yuan, Dong-hai, Guo, Xu-jing, Wen, Li, He, Lian-sheng, Wang, Jing-gang, Li, Jun-qi
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.09.2015
• Subjects: Binding; Cadmium; Cadmium - chemistry; Copper; Copper - chemistry; Decomposition; Dissolved organic matter; Dissolved organic matter (DOM); Excitation spectra; Factor Analysis, Statistical; Fluorescence; Fluorescence quenching; Humic Substances - analysis; Lakes - chemistry; Macrophyte decomposition; PARAFAC analysis; Proteins - chemistry; Spectra; Spectrometry, Fluorescence - methods; Water Pollutants, Chemical - chemistry; Cadmium; PARAFAC analysis; Dissolved organic matter (DOM); Copper; Macrophyte decomposition; Fluorescence quenching
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2015.04.030

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. [Display omitted] •Macrophyte decomposition increases fluorescent DOM components in the upper sediment.•Protein-like components are quenched or enhanced by adding Cu (II) and Cd (II).•Macrophyte decomposition DOM can impact the affinity of Cu (II) and Cd (II).•The log KM and f values showed a marked change due to macrophyte decomposition.•Macrophyte decomposition can maximize the stability constant of DOM-Cu (II) complexes. Macrophyte decomposition DOM can influence on the binding affinity of metal ions in macrophytic lakes.