Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 46, Issue 11, Pages 6102-6109Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es3002212
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Funding
- National Basic Research Program of China [2011CB100503]
- National Natural Science Foundation of China [21007027]
- Specialized Research Fund for the Doctoral Program of Higher Education [20100097120015]
- China Postdoctoral Science Foundation [20100481156, 201104535, 1002017B]
- Fundamental Research Funds for the Central Universities [KYZ201143]
- Agricultural Ministry of China [2011-G27, 201103004]
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The binding characteristics of organic ligands with Al(III) in soil dissolved organic matter (DOM) is essential to understand soil organic carbon (SOC) storage. In this study, two-dimensional (2D) FTIR correlation spectroscopy was developed as a novel tool to explore the binding of organic ligands with AI(III) in DOM present in soils as part of a long-term (21-year) fertilization experiment. The results showed that while it is a popular method for characterizing the binding of organic ligands and metals, fluorescence excitation emission matrix parallel factor analysis can only characterize the binding characteristics of fluorescent substances (i.e., protein-, humic-, and fulvic-like substances) with Al(III). However, 2D FTIR correlation spectroscopy can characterize the binding characteristics of both fluorescent and non-fluorescent (i.e., polysaccharides, lipids, and lignin) substances with Al(III). Meanwhile, 2D FTIR correlation spectroscopy demonstrated that the sequencing/ordering of organics binding with Al(III) could be modified by the use of long-term fertilization strategies. Furthermore, 2D FTIR correlation spectroscopy revealed that the high SOC content in the chemical plus manure (NPKM) treatment in the long term fertilization experiment can be attributed to the formation of noncrystalline microparticles (i.e., allophane and imogolite). In summary, 2D FTIR correlation spectroscopy is a promising approach for the characterization of metal-organic complexes.
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