Insight into humic substances with cotton straw derived amendments by solid state 13C NMR and FTIR spectroscopy

Carbon sequestration of organic materials and biochar in soil is a vital way to increase soil organic carbon (SOC), but the stability of SOC especially the humic substances (HS) is different with these amendments. In this study, cotton straw, compost derived from cotton straw (compost) and biochar derived from cotton straw (biochar) were added with equivalent carbon content into soil and incubated for 180 days. The structural characteristics of humic acid (HA), fulvic acid (FA) and humin (Hu) was studied by solid-state 13C nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The results showed that the aryl C of Hu and FA increased by biochar treatment or biochar incorporated straw or compost and decreased with low ratio of biochar incorporated straw or compost. In addition, phenolic C of Hu and HA increased by straw treatment or biochar incorporated straw and increased with low ratio of biochar incorporated straw or compost. However, O-alkyl C of Hu and HA increased by compost treatment or biochar incorporated compost and increased with low ratio of biochar incorporated straw or compost. These results suggest that the stability of FA amended with straw or compost can be enhanced by incorporating biochar through increasing aryl functional groups, but the stability of HA amended with straw or compost can be enhanced by incorporating biochar through increasing alkyl groups. Biochar was in favor of aryl C formation of FA and Hu, while straw or compost was beneficial to alkyl C formation of HA and Hu.

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Chemical Composition and Structural Characteristics of Oil Shales and Their Kerogens Using Fourier Transform Infrared (FTIR) Spectroscopy and Solid-State 13C Nuclear Magnetic Resonance (NMR)

Energy & Fuels ◽

10.1021/acs.energyfuels.6b00770 ◽

2016 ◽

Vol 30 (8) ◽

pp. 6271-6280 ◽

Cited By ~ 37

Author(s):

Qing Wang ◽

Jiang-bin Ye ◽

Hong-yang Yang ◽

Qi Liu

Keyword(s):

Nuclear Magnetic Resonance ◽

Fourier Transform ◽

Chemical Composition ◽

Solid State ◽

Magnetic Resonance ◽

Ftir Spectroscopy ◽

Structural Characteristics ◽

Fourier Transform Infrared ◽

13C Nuclear Magnetic Resonance ◽

Oil Shales

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Comparison of nuclear magnetic resonance methods for the analysis of organic matter composition from soil density and particle fractions

Environmental Chemistry ◽

10.1071/en11096 ◽

2012 ◽

Vol 9 (1) ◽

pp. 97 ◽

Cited By ~ 40

Author(s):

Joyce S. Clemente ◽

Edward G. Gregorich ◽

André J. Simpson ◽

Rajeev Kumar ◽

Denis Courtier-Murias ◽

...

Keyword(s):

Nuclear Magnetic Resonance ◽

Solid State ◽

Magnetic Resonance ◽

1H Nmr ◽

Solution State ◽

Soil Fractions ◽

13C Nuclear Magnetic Resonance ◽

Nmr Methods ◽

Solid State 13C Nmr ◽

Nuclear Magnetic

Environmental contextThe association of specific organic matter (OM) compounds with clay mineral surfaces is believed to protect these compounds from degradation and thus result in long-term protection in soil. The molecular-level composition of soil OM associated with soil fractions was measured and compared using solid-state 13C nuclear magnetic resonance (NMR) and solution-state 1H NMR methods. Combining these methods allowed more detailed characterisation of OM associated with different soil fractions and will improve the understanding of OM dynamics in soil. AbstractOrganic matter (OM) associated with fine soil fractions is hypothesised to be protected from complete biodegradation by soil microbes. It is therefore important to understand the structure and stage of decomposition of OM associated with various soil fractions. Solid-state 13C nuclear magnetic resonance (NMR) spectroscopy has been used extensively to investigate the OM composition of soils and soil fractions. Solution-state 1H NMR spectroscopy has not been used as much but is an emerging tool for analysing soil OM because 1H NMR spectra are often better resolved and provide information that complements the structural information obtained from solid-state 13C NMR experiments. This study compares one-dimensional solution-state 1H NMR and solid-state 13C NMR methods for assessing the degradation and composition of OM in three different soils, and their light and clay-size fractions. The alkyl/O-alkyl degradation parameter was consistent across all NMR methods and showed that OM associated with clay-size fractions were at more advanced stages of degradation as compared to that in light density soil fractions. Solution-state 1H and diffusion edited (DE) 1H NMR results showed the presence of high concentrations of microbial-derived peptidoglycan and peptide side-chains in clay-sized fractions. Lignin was also identified in clay-sized fractions using solid-state 13C and solution-state 1H NMR techniques. The combination of solid-state 13C and solution-state 1H NMR methods provides a more detailed analysis of OM composition and thereby facilitates a better understanding of the fate and preservation of OM in soil.

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Quantitative aspects of solid-state 13C-NMR spectra of humic substances from soils of volcanic systems

Geoderma ◽

10.1016/s0016-7061(97)00058-x ◽

1997 ◽

Vol 80 (3-4) ◽

pp. 327-338 ◽

Cited By ~ 56

Author(s):

P. Conte ◽

A. Piccolo ◽

B. Van Lagen ◽

P. Buurman ◽

P.A. de Jager

Keyword(s):

Solid State ◽

Humic Substances ◽

13C Nmr ◽

Nmr Spectra ◽

13C Nmr Spectra ◽

Solid State 13C Nmr

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Solid State 13C NMR Measurements of Humic Substances. An Examination of Factors Affecting their Reliable Interpretation

NMR of Humic Substances and Coal ◽

10.1201/9781003069805-11 ◽

2020 ◽

pp. 211-223

Author(s):

Anthony M. Vassallo

Keyword(s):

Solid State ◽

Humic Substances ◽

13C Nmr ◽

Factors Affecting ◽

Reliable Interpretation ◽

Solid State 13C Nmr

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Insight into Understanding Dielectric Behavior of a Zn-MOF Using Variable-Temperature Crystal Structures, Electrical Conductance, and Solid-State 13C NMR Spectra

Inorganic Chemistry ◽

10.1021/acs.inorgchem.6b01759 ◽

2016 ◽

Vol 55 (22) ◽

pp. 11716-11726 ◽

Cited By ~ 11

Author(s):

Yuan-Bo Tong ◽

Shao-Xian Liu ◽

Yang Zou ◽

Chen Xue ◽

Hai-Bao Duan ◽

...

Keyword(s):

Solid State ◽

Crystal Structures ◽

13C Nmr ◽

Nmr Spectra ◽

Variable Temperature ◽

Electrical Conductance ◽

Dielectric Behavior ◽

13C Nmr Spectra ◽

Insight Into ◽

Solid State 13C Nmr

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INSIGHT INTO THE STRUCTURE AND FORMATION OF TITANIUM OXIDE NANOTUBES

Functional Materials Letters ◽

10.1142/s1793604708000435 ◽

2008 ◽

Vol 01 (03) ◽

pp. 239-246 ◽

Cited By ~ 20

Author(s):

YINGCHUN ZHU

Keyword(s):

Structure Formation ◽

Titanium Oxide ◽

Formation Mechanism ◽

Chemical Bonding ◽

Structural Model ◽

Structural Characteristics ◽

Titanium Oxide Nanotubes ◽

The Stability ◽

Experimental Findings ◽

Insight Into

Titanium oxide nanotube is a promising material for versatile applications. However, its structure and formation mechanism were quite confusedly reported. Therefore, it is essential to fully understand its structure, formation mechanism and stability. In this study, the structure, formation and stability of titanium oxide nanotube were studied in detail. New experimental findings on the morphology of titanium oxide nanotubes were reported, demonstrating close-opened nanotubes, cone-shaped nanotubes, twin and ternary nanotubes etc. A structural model of the titanium oxide nanotubes is proposed on the basis of cylinders of smoothly curved sheets of TiO 6 octahedra, among which H + and H 3 O + are intercalated. The formation mechanism of titanium oxide nanotubes was deduced and discussed on the basis of their structural characteristics and chemical bonding behaviors of constituent atoms. The stability of the nanotubes was also studied under different conditions.

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