Detection of dissolved organic matter in saline–alkali soils using synchronous fluorescence spectroscopy and principal component analysis

PCA factor scores vs. spectral wavelength. These plots indicate which spectral shapes are associated with the variance in the overall signal, which is used to identify the fluorophores that contribute to the variance in the soil DOM. PCA has been shown to be an effective technique for identifying th...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2013-03, Vol.104, p.280-286
Main Authors: Guo, Xu-jing, Yuan, Dong-hai, Jiang, Jin-yuan, Zhang, Hui, Deng, Yu
Format: Article
Language:English
Subjects:
Dissolved organic matter
Humification degree
Principal component analysis
Synchronous fluorescence spectroscopy
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Summary:PCA factor scores vs. spectral wavelength. These plots indicate which spectral shapes are associated with the variance in the overall signal, which is used to identify the fluorophores that contribute to the variance in the soil DOM. PCA has been shown to be an effective technique for identifying the constituent components of synchronous fluorescence spectra of DOM. Six fluorescence peaks, T1 (275nm), T2 (283nm), T3 (291nm), H1 (318nm), H2 (345nm) and H3 (362nm), can be identified by PCA. [Display omitted] ► The analysis of PCA yielded 2 PCs that account for 97% of the variance. ► Two dominant fluorophores can be identified by PC1 and PC2 respectively. ► Five main clusters can be identified by HCA in 32 soils. ► Land use and agricultural irrigation are important factors of humification process. Dissolved organic matter (DOM) is attributed a key role in soil major biogeochemical processes. Its molecular characteristics can reflect both its source and its biogeochemical history. Saline–alkali soil samples were collected from a field in desert and semi-desert region. DOM was analyzed by synchronous fluorescence spectroscopy. Principal Components Analysis (PCA) of synchronous fluorescence spectra was used to detect and describe changes in the DOM in different soil profiles. The analysis of PCA yielded 2 PCs that account for 97% of the variance. DOM is characterized by a dominant tyrosine-like fluorophore in the Region I (PC1>0.9, PC20.9) and lower PC1 (
ISSN:1386-1425
DOI:10.1016/j.saa.2012.11.081