Combined UV–Vis absorbance and fluorescence properties of extracted humic substances-like for characterization of composting evolution of domestic solid wastes

Geoderma ◽  
2009 ◽  
Vol 151 (3-4) ◽  
pp. 61-67 ◽  
Author(s):  
Faustino E. Morán Vieyra ◽  
Valeria I. Palazzi ◽  
María I. Sanchez de Pinto ◽  
Claudio D. Borsarelli
Keyword(s):  
Humic Substances ◽  
Solid Wastes ◽  
Fluorescence Properties

scholarly journals Characterization of Soil Organic Matter Individual Fractions (Fulvic Acids, Humic Acids, and Humins) by Spectroscopic and Electrochemical Techniques in Agricultural Soils

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1067
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bożena Smreczak
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Sorption Properties ◽  
Aliphatic Chains

The objective of this paper was to investigate the molecular characterization of soil organic matter fractions (humic substances (HS): fulvic acids-FAs, humic acids-HAs, and humins-HNs), which are the most reactive soil components. A wide spectrum of spectroscopic (UV–VIS and VIS–nearIR), as well as electrochemical (zeta potential, particle size diameter, and polydispersity index), methods were applied to find the relevant differences in the behavior, formation, composition, and sorption properties of HS fractions derived from various soils. Soil material (n = 30) used for the study were sampled from the surface layer (0–30 cm) of agricultural soils. FAs and HAs were isolated by sequential extraction in alkaline and acidic solutions, according to the International Humic Substances Society method, while HNs was determined in the soil residue (after FAs and HAs extraction) by mineral fraction digestion using a 0.1M HCL/0.3M HF mixture and DMSO. Our study showed that significant differences in the molecular structures of FAs, Has, and HNs occurred. Optical analysis confirmed the lower molecular weight of FAs with high amount of lignin-like compounds and the higher weighted aliphatic–aromatic structure of HAs. The HNs were characterized by a very pronounced and strong condensed structure associated with the highest molecular weight. HAs and HNs molecules exhibited an abundance of acidic, phenolic, and amine functional groups at the aromatic ring and aliphatic chains, while FAs mainly showed the presence of methyl, methylene, ethenyl, and carboxyl reactive groups. HS was characterized by high polydispersity related with their structure. FAs were characterized by ellipsoidal shape as being associated to the long aliphatic chains, while HAs and HNs revealed a smaller particle diameter and a more spherical shape caused by the higher intermolecular forcing between the particles. The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition, and sorption properties, which reflects their binding potential to other molecules depending on soil properties resulting from their type. The determined properties of individual HS fractions are presented as averaged characteristics over the examined soils with different physico-chemical properties.

Capillary isoelectric focusing (CIEF) for the characterization of humic substances

1997 ◽  
Vol 31 (8) ◽  
pp. 2037-2049 ◽  
Author(s):  
Ph. Schmitt ◽  
A.W. Garrison ◽  
D. Freitag ◽  
A. Kettrup
Keyword(s):  
Humic Substances ◽  
Isoelectric Focusing ◽  
Capillary Isoelectric Focusing

Characterization of Ceramic Tiles Added with EAF Slag Waste

2014 ◽  
Vol 1024 ◽  
pp. 211-214 ◽  
Author(s):  
Pao Ter Teo ◽  
Abu Seman Anasyida ◽  
Mohd Sharif Nurulakmal
Keyword(s):  
Flexural Strength ◽  
Raw Materials ◽  
Solid Wastes ◽  
Arc Furnace ◽  
Ceramic Tiles ◽  
Total Percentage ◽  
Eaf Slag ◽  
Ball Clay ◽  
Slag Waste

The increasing production of steel leads to an increment of solid wastes generated especially Electric Arc Furnace (EAF) slag. This becomes a serious concern as the slag has to be disposed in a proper manner in order to avoid dumping in landfills which will eventually occupy available land and may cause permanent damage to the flora and fauna. In this project, an attempt was made to utilize the EAF slag as one of the raw materials in ceramic tiles. Results obtained showed that as percentage of EAF slag added was increased up to 60%, percentage of apparent porosity and water absorption were found to increase, accompanied by reduction in flexural strength due to more severe porosity was observed in the tiles. On the other hand, reducing the percentage of EAF slag up to 40% while increasing percentage of ball clay added led to formation of higher total percentage of anortite and wollastonite minerals. This would contribute to higher flexural strength of tiles. In addition, by adding silica and feldspar, the flexural strength of tile produced was further improved due to optimization of densification process. Highest flexural strength of EAF slag based tiles was attained at composition of 40% EAF slag 30% ball clay 10% feldspar 20% silica. It was observed that properties of ceramic tiles added with EAF slag, especially flexural strength are comparable with commercial ceramic tiles. Therefore, the EAF slag ceramic tiles have great potential to be made into high flexural strength or wear resistant floor tiles.

scholarly journals Molecular Weight Characterization of Humic Substances by MALDI-TOF-MS

2004 ◽  
Vol 52 (1) ◽  
pp. 29-32 ◽  
Author(s):  
Toshiyuki SHINOZUKA ◽  
Mitsuhiro SHIBATA ◽  
Tatsuaki YAMAGUCHI
Keyword(s):  
Molecular Weight ◽  
Humic Substances ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Tof Ms

Characterization of volatile compounds produced by Rhizopus strains grown on agro-industrial solid wastes

2000 ◽  
Vol 71 (3) ◽  
pp. 211-215 ◽  
Author(s):  
P. Christen ◽  
A. Bramorski ◽  
S. Revah ◽  
C.R. Soccol
Keyword(s):  
Volatile Compounds ◽  
Solid Wastes
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