title: Binding of organic ligands with Al(III) in dissolved organic matter from soil: implications for soil organic carbon storage.
abstract: 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 Al(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 nonfluorescent (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.
authors.affiliation: Jiangsu Key Lab for Organic Solid Waste Utilization, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
authors.forename: Guang-Hui
authors.initials: GH
authors.lastname: Yu
authors.forename: Min-Jie
authors.initials: MJ
authors.lastname: Wu
authors.forename: Guan-Ran
authors.initials: GR
authors.lastname: Wei
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Luo
authors.forename: Wei
authors.initials: W
authors.lastname: Ran
authors.forename: Bo-Ren
authors.initials: BR
authors.lastname: Wang
authors.forename: Jian-chao
authors.initials: JC
authors.lastname: Zhang
authors.forename: Qi-Rong
authors.initials: QR
authors.lastname: Shen
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002244:Carbon / Q000032:analysis* / Q000737:chemistry*; D005163:Factor Analysis, Statistical; D007700:Kinetics; D008024:Ligands; D009930:Organic Chemicals / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012995:Solubility; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D008024:Ligands; D009930:Organic Chemicals; D012987:Soil; D002244:Carbon; D000535:Aluminum