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Complexation between Hg(II) and biofilm extracellular polymeric substances: An application of fluorescence spectroscopy
Daoyong Zhang; Xiangliang Pan; Khan M.G.Mostofa; Xi Chen; Guijin Mu; Fengchang Wu; Jing Liu; Wenjuan Song; Jianying Yang; Yanli Liu; Qinglong Fu
2010
Source PublicationJournal of Hazardous Materials
Volume175Issue:1–3Pages:359-365
AbstractThe three-dimensional excitation emission matrix (EEM) fluorescence spectroscopy was employed to investigate the interaction of extracellular polymeric substances (EPS) from natural biofilm with Hg(II). The EEM spectra demonstrated that EPS with molecular weight over 14 kDa had two protein-like fluorescence peaks. The fluorescence intensity at both peaks was strongly dependent on the solution pH in the absence and presence of Hg(II), with the maximal fluorescence intensity at neutral pH. Fluorescence of both protein-like peaks was significantly quenched by Hg(II). The values of conditional stability constants (log Ka = 3.28–4.48) derived from modified Stern–Volmer equation are approximate to those for humic substances and dissolved organic matter (DOM), indicating that fluorescent components in EPS have strong binding capacity for Hg(II). Our findings suggest that EPS from biofilm is a class of important organic ligands for complexation with Hg(II) and may significantly affect the chemical forms, mobility, bioavailability and ecotoxicity of heavy metals in the aquatic environment.
KeywordExtracellular Polymeric Substances Mercury Complexation Fluorescence Quenching Titration
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6833
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Daoyong Zhang,Xiangliang Pan,Khan M.G.Mostofa,et al. Complexation between Hg(II) and biofilm extracellular polymeric substances: An application of fluorescence spectroscopy[J]. Journal of Hazardous Materials,2010,175(1–3):359-365.
APA Daoyong Zhang.,Xiangliang Pan.,Khan M.G.Mostofa.,Xi Chen.,Guijin Mu.,...&Qinglong Fu.(2010).Complexation between Hg(II) and biofilm extracellular polymeric substances: An application of fluorescence spectroscopy.Journal of Hazardous Materials,175(1–3),359-365.
MLA Daoyong Zhang,et al."Complexation between Hg(II) and biofilm extracellular polymeric substances: An application of fluorescence spectroscopy".Journal of Hazardous Materials 175.1–3(2010):359-365.
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