C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF SOIL HUMIC SUBSTANCES EXTRACTED BY DIFFERENT MECHANISMS

被引：48

作者：

PICCOLO, A ^{[1
]}

CAMPANELLA, L ^{[1
]}

PETRONIO, BM ^{[1
]}

机构：

[1] UNIV ROME LA SAPIENZA,DEPT CHEM,I-00185 ROME,ITALY

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 1990年 / 54卷 / 03期

关键词：

D O I：

10.2136/sssaj1990.03615995005400030021x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Humic substances were extracted from an organic soil of Tuscany, Italy, with solutions operating by three different mechanisms: charge repulsion (NaOH under N2) ligand exchange (Na4P2O7 at pH = 7) and H-bond disruption (dipolar aprotic solvents in mixture with dilute HCl). Solution-state 13C-nuclear magnetic resonance (NMR) spectra were obtained for the unpurified and purified (HCl-HF treatment) extracts, revealing that humic matter obtained through the H-bond-disruption mechanism was different from materials extracted using the two other mechanisms. Poor agreement between values for total acidity of extracts calculated by NMR and those given by chemical methods was also observed in this study. -from Authors

引用

页码：750 / 756

页数：7

共 21 条

[1]

BREITMAIER E, 1987, 13C NMR SPECTROSCOPY

[2]

CHOUDHRI M. B., 1957, SOIL SCI SOC AMER PROC, V21, P508

[3] ANALYTICAL CHARACTERISTICS OF HUMIC AND FULVIC ACIDS EXTRACTED FROM TROPICAL VOLCANIC SOILS [J].