The study of humification process of compost using humic acid and its functional groups

2010 ◽  
Author(s):  
Natdhera Sanmanee ◽  
Anchalee Chainet ◽  
Kullanart Obsuwan ◽  
Kamolchanok Panishkan ◽  
Sirichai Dharmvanij
Keyword(s):  
Humic Acid ◽  
Functional Groups

Humic acid regulation of the environmental behavior and phytotoxicity of silver nanoparticles to Lemna minor

2019 ◽  
Vol 6 (12) ◽  
pp. 3712-3722 ◽  
Author(s):  
Yuanyuan Ding ◽  
Xue Bai ◽  
Zhengfang Ye ◽  
Dongqing Gong ◽  
Jiajing Cao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Functional Groups ◽  
Molecular Interaction ◽  
Lemna Minor ◽  
Environmental Behavior

Results suggest that molecular interaction occurs between AgNPs and HA functional groups and HA can reduce the toxicity of AgNPs to Lemna minor.

Nonaqueous titration of functional groups in humic acid

1985 ◽  
Vol 8 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Koyo Yonebayashi ◽  
Tomoo Hattori
Keyword(s):  
Humic Acid ◽  
Functional Groups

scholarly journals EKSTRAKSI BAHAN HUMAT DARI BATUBARA (SUBBITUMINUS) DENGAN MENGGUNAKAN 10 JENIS PELARUT

Jurnal Solum ◽  
2007 ◽  
Vol 4 (2) ◽  
pp. 73
Author(s):  
Dewi Rezki ◽  
Fachri Ahmad ◽  
Gusnidar Gusnidar
Keyword(s):  
Humic Acid ◽  
Oxalic Acid ◽  
Formic Acid ◽  
Laboratory Experiment ◽  
Humic Substances ◽  
Functional Groups ◽  
Effective Solution ◽  
Infra Red ◽  
Bituminous Coals

This experiment was conducted to extract sub-bituminous coals for obtaining humic substances by using 10 kinds of extract solutions.  The best and effective solution was investigated and also the characteristics of humic substances soluble in those solution.  Complete Randomize Design was used to find out the effect of treatments.  Two types of coals were taken from Pasaman and Sawahlunto and the ten kinds of extract solutions were 0.1 N NaOH, 0.5 N NaOH, 0.1 M Na2CO3, 0.5 Na2CO3, 0.1 N HCl, 0.1 M Formic Acid, 0.1 M Oxalic Acid, 0.025 N HF, Ethanol 70 %, and Ethanol 90 %.  Results of this laboratory experiment showed that all ten extraction solutions had the ability to extract humic substances but in different amount.  The best solution that could be used effectively was 0.5 N NaOH.  This solution could extract 31.5 % of humic substances from Pasaman Sub-bituminous coals, but only 15.4 % could be extracted from that of Sawahlunto.  Infra Red Spectrometer was also used to identify the characteristics of functional groups appear on those humic substances extracted.Key Words: humic acid, coal

Analysis of Carbon Functional Groups in Mobile Humic Acid and Recalcitrant Calcium Humate Extracted from Eight US Soils

Pedosphere ◽  
2013 ◽  
Vol 23 (6) ◽  
pp. 705-716 ◽  
Author(s):  
Zhong-Qi HE ◽  
Xiao-Yan CAO ◽  
Jing-Dong MAO ◽  
T. OHNO ◽  
H.M. WALDRIP
Keyword(s):  
Humic Acid ◽  
Functional Groups

Le transport chimique de l'or dans les environnements de surface: formation d'un colloïde et complexation organique

1989 ◽  
Vol 26 (11) ◽  
pp. 2327-2332 ◽  
Author(s):  
Mario Bergeron ◽  
Yves Harrison
Keyword(s):  
Humic Acid ◽  
Fulvic Acid ◽  
Humic Substances ◽  
Functional Groups ◽  
Sulfide Oxidation ◽  
Chemical Transport ◽  
Potassium Humate ◽  
Inorganic Complexes ◽  
Second Category ◽  
Gold Solubility

Two different categories of experiments were undertaken to determine the significance of humic substances in the chemical transport of gold. The experiments of the first category were designed to study Au(Cl)4− reduction by humic acid at pH 3.5, which is consistent with the formation of this ion in sulfide oxidation zones. These experiments were repeated with denaturated humic acid (obtained by heating in an acid medium). The results show that Au(Cl)4− is reduced by humic acid to an unstable colloid, but not by denaturated humic acid. The purpose of the second category of experiments was to study gold solubility in various organic materials: humic acid, fulvic acid, and potassium humate. Solutions of these substances and demineralized water (the latter served as the reference point) were placed in contact with metallic gold for 1 month at pH 7, the common pH in surface environments. The data indicate an increase in gold solubility according to the following order: humic acid < fulvic acid < potassium humate. A two-step gold chemical-transport mechanism for surface environments is proposed on the basis of our results. In the first step, unstable colloidal gold is formed from inorganic complexes produced in the sulfide oxidation zones (zones with acidic pH). After full oxidization, the pH moves to the normal value, causing the dissociation of functional groups in humic substances. In the second step, these humic substances, through the dissociated functional groups, could form organo-metallic complexes with gold, ensuring gold dispersion in surface environments. [Journal Translation]

scholarly journals Humic Acid-Oxidizing, Nitrate-Reducing Bacteria in Agricultural Soils

mBio ◽  
2011 ◽  
Vol 2 (4) ◽  
Author(s):  
J. Ian Van Trump ◽  
Kelly C. Wrighton ◽  
J. Cameron Thrash ◽  
Karrie A. Weber ◽  
Gary L. Andersen ◽  
...  
Keyword(s):  
Humic Acid ◽  
Bacterial Community ◽  
Functional Groups ◽  
Humic Acids ◽  
Nitrate Reduction ◽  
Agricultural Soils ◽  
Soil Microbial Communities ◽  
No Donor ◽  
Probable Number ◽  
Soil Systems

ABSTRACTThis study demonstrates the prevalence, phylogenetic diversity, and physiology of nitrate-reducing microorganisms capable of utilizing reduced humic acids (HA) as electron donors in agricultural soils. Most probable number (MPN) enumeration of agricultural soils revealed large populations (104to 106 cells g−1soil) of microorganisms capable of reducing nitrate while oxidizing the reduced HA analog 2,6-anthrahydroquinone disulfonate (AH2DS) to its corresponding quinone. Nitrate-dependent HA-oxidizing organisms isolated from agricultural soils were phylogenetically diverse and included members of theAlphaproteobacteria,Betaproteobacteria, andGammaproteobacteria. Advective up-flow columns inoculated with corn plot soil and amended with reduced HA and nitrate supported both HA oxidation and enhanced nitrate reduction relative to no-donor or oxidized HA controls. The additional electron donating capacity of reduced HA could reasonably be attributed to the oxidation of reduced functional groups. Subsequent 16S rRNA gene-based high-density oligonucleotide microarray (PhyloChip) indicated that reduced HA columns supported the development of a bacterial community enriched with members of theAcidobacteria,Firmicutes, andBetaproteobacteriarelative to the no-donor control and initial inoculum. This study identifies a previously unrecognized role for HA in stimulating denitrification processes in saturated soil systems. Furthermore, this study indicates that reduced humic acids impact soil geochemistry and the indigenous bacterial community composition.IMPORTANCEThis study identifies a new metabolic capacity in soil microbial communities that may be responsible for the mediation of significant nitrogen losses from soil systems. Nitrate-dependent humic acid (HA)-oxidizing organisms isolated from agricultural soils were phylogenetically diverse and included members ofAlphaproteobacteria,Betaproteobacteria, andGammaproteobacteria. Advective up-flow columns inoculated with corn plot soil and amended with reduced HA and nitrate supported both HA oxidation and enhanced nitrate reduction relative to no-donor or oxidized HA controls. The additional electron donating capacity of reduced HA could reasonably be attributed to the oxidation of reduced functional groups.

scholarly journals Humic Acid Isolation from Batujai Dam Lombok Tengah-NTB and its Potential as Reductive–Biosorbent Au(III) in The Batch System

2020 ◽  
Vol 21 (1) ◽  
pp. 43
Author(s):  
Nurul Ismillayli ◽  
Dhony Hermanto
Keyword(s):  
Humic Acid ◽  
Ftir Spectroscopy ◽  
Functional Groups ◽  
Aromatic Ring ◽  
Adsorption Process ◽  
Aliphatic Hydrocarbon ◽  
Gold Particles ◽  
Batch System ◽  
Sem Analyses

The Study of Au(III) ions adsorption by humic acid in batch system has been done. Humic acid was isolated from Batujai Dam Lombok Tengah 0.1 M NaOH and continued with 0.1 M HCl/0.3 M HF washing to dissolve silica. Functional groups of isolated humic acid was investigated by FTIR Spectroscopy and the adsorption process was studied by XRD and SEM analyses. It has been found that humic acid contained carboxylic, phenols, alcoholic, ether, amines functional groups, aliphatic hydrocarbon and aromatic ring. XRD and SEM data showed that humic acid did not only adsorp Au(III) ions but also reduce them to gold particles. Therefore, humic acid has the potential as reductive-biosorbent for Au(III) in batch system. Keywords: humic acid, reductive-biosorbent, Au(III) ions.

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