Citation: Xin Liu, Hua Lv, Hua-Cheng Xu. Two-dimension fluorescence correlation spectroscopy to characterize the binding of organic ligands with zinc in eutrophic lake[J]. Chinese Chemical Letters, ;2015, 26(2): 205-209. doi: 10.1016/j.cclet.2014.10.004 shu

Two-dimension fluorescence correlation spectroscopy to characterize the binding of organic ligands with zinc in eutrophic lake

Xin Liu ^a ,
Hua Lv ^a,b ,
Hua-Cheng Xu ^b,,

1.
a College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
2.
b State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China

Corresponding author: Hua-Cheng Xu,
Received Date: 27 August 2014
Available Online: 25 September 2014
Fund Project: This work was funded by the National Natural Science Foundation of China (Nos. 51479187, 51209192) (Nos. 51479187, 51209192)

Metal binding of organic ligands can definitely affect its environmental behavior in waters, while information on the binding heterogeneity with different organic ligands is still lacked till now. In this study, the binding of zinc with organic matters associated with cyanobacterial blooms, including dissolved organic matters (DOM) and attached organic matters (AOM), were studied by using fluorescence quenching titration combined with two-dimensional correlation spectroscopy (2D-COS). Metal-induced fluorescent quenching was obviously observed both for DOM and AOM, indicating the formation of metal-ligand complexes. Compared with the one-dimensional spectra, 2D-COS revealed the sequences of metal-ligand interaction with the following orders: 276 nm > 232 nm for DOM and 232 nm > 276 nm for AOM. Furthermore, the modified Stern-Volmer model showed that the binding constant (log KM) of 276 nm in DOM was higher than that of 232 nm (4.93 vs. 4.51), while AOM was characterized with a high binding affinity for 232 nm (log KM: 4.83). The ranks of log KM values were consistent with the sequential orders derived from 2D-COS results both for the two samples. Fluorescence quenching titration combined with 2D-COS was an effective method to characterize the metal-ligand interaction.
- Metal binding,
- Eutrophic lakes,
- Dissolved organic matters (DOM),
- Attached organic matters (AOM),
- Two-dimensional correlation spectroscopy,
- (2D-COS)
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