Infrared, Raman, and nuclear magnetic resonance (H-1, C-13, and P-31) spectroscopy in the study of fractions of peat humic acids
Infrared, Raman, and nuclear magnetic resonance (H-1, C-13, and P-31) spectroscopy in the study of fractions of peat humic acids
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DOI：
10.1366/0003702963905169
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发表时间：
1996-09-01
影响因子：
3.5
通讯作者：
Gessa, C
中科院分区：
文献类型：
--
作者：
Francioso, O;SanchezCortes, S;Gessa, C
傅里叶变换红外光谱（FT-IR），表面增强拉曼光谱（Sers），核磁共振（MMR）（H-1，C-13，和P-31）已被应用于研究的腐殖酸在爱尔兰泥炭馏分。由于这些物质的高荧光性，迄今为止还没有获得用于表征腐殖酸的拉曼光谱。本文首次将Sers技术应用于这些复杂物质的研究，表明可以获得有关这些大分子在水溶液中的芳香基团和空间构象的非常有价值的信息。这些技术的组合使用已经证明了在那些含有低分子量腐殖酸的馏分中含氧基团的增加。大量羧酸根和酚基的存在可以解释在这些馏分中发现的高浓度的金属和磷酸根离子。
Fourier transform infrared spectroscopy (FT-IR), surface-enhanced Raman spectroscopy (SERS), and nuclear magnetic resonance (MMR) (H-1, C-13, and P-31) have been applied to the study of fractions of humic acids in Irish peat. Owing to the high fluorescence of these materials, no Raman spectra have been obtained, up to now, for the characterization of humic acids. The SERS technique was employed for the first time in the study of these complex substances, demonstrating that very valuable information about the aromatic groups and the spacial conformation of these macromolecules in water solution can be obtained. The combined use of these techniques has evidenced an increase of oxygenated groups in those fractions containing humic acids with low molecular weight. The presence of a greater number of carboxylate and phenolic groups can explain the high concentration of metals and phosphate ions found in these fractions.