Long term effects of a brown coal-based amendment on the properties of soil humic acids

Kwiatkowska, J.; Provenzano, Maria Rosaria; Senesi, N.

doi:10.1016/j.geoderma.2008.10.001

Cited by 50 publications

(38 citation statements)

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“…This fact may be attributed to the increased content of simple aromatics in the extracted HA. It is in accordance with the previous studies, and may suggest the presence of simple structural components of small molecular size bearing electron-donating substituents, such as hydroxyl, methoxy, and aromatic polycondensation and conjugated chromophores in humic acids (Senesi et al 1991; Chen et al 2002;Sierra et al 2005;Kwiatkowska et al, 2008;Wang et al 2014). All spectra were characterized by two peaks: one at 330ex/440em and second, smaller at 340ex/ 450em with the exception of spectrum for SP0.25, which was distinguished by the fact that the first peak was shifted to shorter excitation wavelengths and centered at 310ex/ 440em.…”

Section: Resultssupporting

confidence: 92%

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Huculak-Mączka

Hoffmann

2018

J Soils Sediments

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Purpose Technological progress and high market demand contributed to a significant interest in the production of fertilizers based on humic acids. The aim of this study was to evaluate the possibilities of using humic acids obtained from lignite in the production of new commercial products. For this purpose, it is necessary to determine the quality standard requirements for such material. Properties of humic acids depend on source of origin as well as method of its extraction. Materials and methods The humic acids were extracted from polish deposit of lignite-Sieniawa Lubuska by alkaline extraction using for this purpose six kinds of extractants: 0.1 M NaOH and 0.25 M NaOH, 0.1 M KOH and 0.25 M KOH, and 0.1 M Na 4 P 2 O 7 and 0.25 M Na 4 P 2 O 7 . The humic samples were used in solid powder form and characterized by UV-Vis spectroscopy, 13 C NMR spectroscopy, fluorescence spectroscopy, and thermal analysis. Results and discussion The determining factor influencing a degree of humic acids extraction from lignite and their structure is type of extractant. The largest efficiency of extraction (about 50%) was obtained with the use of NaOH solutions. All examined humic acids were generally characterized by simple and heterogeneous molecularly structure with low molecular weight and low aromatic polycondensation. Therefore, it can be concluded that humic acids extracted with NaOH and KOH solutions are less condensed than those extracted with Na 4 P 2 O 7 solutions. It can suggest that humic acids obtained from lignite using solutions of Na 4 P 2 O 7 are characterized by a low transformation degree and greater amount of carboxyl groups. Conclusions Low rank coal can be successfully used in agriculture as a rich source of humic acids. Reagent used in their extraction, apart from high efficiency should have a neutral impact on their structure. Studies on the physicochemical properties of humic acids can be helpful in predicting behaviors of such fertilizer components in the environment and in inventing new products taking the principles of sustainable development into consideration.

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Section: Resultssupporting

confidence: 92%

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Huculak-Mączka

Hoffmann

2018

J Soils Sediments

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“…The FTIR spectra of the humic acids extracted from unoxidized coal at different particle sizes showed the same bands in the region ranging from 4,000 to 2,400 cm -1 attributed to OH stretching of phenolic and acid groups (3,400 cm -1 ), and CH stretching of aliphatic chains or branches (2,914, 2,838 cm -1 ) (Kwiatkowska, et al, 2008;Calemma, et al, 1994). The coal with 0.063-mm particle size yielded a greater humic acid yield (Table 4) 3.500 3.000 2.500 2.000 1.500 1.000…”

Section: Resultsmentioning

confidence: 90%

“…These aromatic structures are also linked to carboxylic and phenolic groups and to aliphatic chains (Kurková, et al, 2004). Due to environmental problems of the energy applications of coal it is important to find alternative uses for low-grade coals, such as production of activated carbon, building materials, carbon fibers and humic acids for soil fertilization and remediation (Kwiatkowska, et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size and oxidant concentration in the yield of humic acids from mineral coal using response surface methodology

Pájaro-Payares

Espinosa-Fuentes

Colpas-Castillo

et al. 2017

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Humic acids are produced by decomposition of organic soil material and from oxidation of mineral coals. In this study, the effect of oxidation and the yield of humic acids extracted from a sample of Colombian mineral coal were studied by response surface methodology (RSM). The variables used were: particle size (0.063, 0.106 and 0.150 mm), concentration of the oxidizing agent (KMnO 4 : 0.010, 0.020 and 0.050 M) and oxidation time (30, 60 and 90 minutes). The degree of oxidation was verified by infrared spectroscopy. Oxidation increased oxygen groups in the carbonaceous matrix, mainly due to oxidation of aliphatic components. Extraction yields above 24% were obtained with 0.063 mm particle size and 0.020 M KMnO 4 . © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.Key words: bituminous coal; humic acids; oxidation process; surface response; factorial design. Efecto del tamaño de partícula y la concentración del oxidante en el rendimiento de ácidos húmicos obtenidos de carbón mineral proveniente de Colombia usando la metodología de superficie de respuesta ResumenLos ácidos húmicos se producen por la descomposición de la materia orgánica de los suelos y por la oxidación de carbones minerales. En este estudio se analizó mediante superficies de respuesta el efecto de la oxidación en la extracción de ácidos húmicos de un carbón colombiano. Las variables de oxidación estudiadas fueron las siguientes: tamaño de partícula (0,063, 0,106 y 0,150 mm), concentración del agente oxidante (permanganato de potasio (KMnO 4 ): 0,010, 0,020 y 0,050 M) y tiempo de oxidación (30, 60 and 90 minutos). El grado de oxidación se verificó con espectroscopia infrarroja. La oxidación incrementó los grupos oxigenados en la matriz carbonácea debido, principalmente, a la oxidación de componentes alifáticos. Se obtuvieron porcentajes de extracción superiores a 24 % al usar partículas de 0,063 mm y KMnO 4 con 0,020 M.

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“…7,8 Los ácidos húmicos extraídos de carbón fósil difieren estructuralmente dependiendo del rango del carbón fósil y de la región de los yacimientos, sin embargo en términos generales los principales constituyentes de los ácidos húmicos son fragmentos aromáticos unidos a través de diversos tipos de puentes químicos y con sustituyentes ricos en oxígeno. 9 Cuando los carbones fósiles se someten a reacciones de oxidación moderadas ocurre una degradación parcial de la materia orgánica presente en los carbones al tiempo en que se aumenta el número de grupos funcionales conteniendo oxígeno, principalmente los de tipo carboxílico y fenólico. Este tipo de reacciones incrementa el contenido de sustancias húmicas en su estructura, lo que también conlleva a mayores porcentajes de extracción de este tipo de materiales.…”

Section: Introductionunclassified

Aumento del contenido de ácidos húmicos en un carbón de bajo rango a través de la oxidación con aire y con peróxido de hidrogeno o ácido nítrico

Anillo-Correa¹,

Colpas-Castillo²,

Fuentes³

2013

Quím. Nova

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Recebido em 30/4/12; aceito em 18/9/12; publicado na web em 23/1/13 INCREASE OF THE CONTENT OF HUMIC ACIDS IN A LOW RANK COAL BY OXIDATION WITH AIR AND WITH HYDROGEN PEROXIDE OR NITRIC ACID. Low-rank coals are an important source of humic acids, which are important in retention processes of water and nutrients in plants. In this study coal samples of Montelibano, Colombia, were oxidized with air at different temperatures and subsequently with H 2 O 2 and HNO 3 . The materials were characterized by FTIR, proximate and elemental analysis, and quantification of humic acids. The oxidation process led to an increased content of oxygenated groups and humic acids in the carbonaceous structure. The solid oxidized with air at 200 °C for 12 h and re-oxidized with HNO 3 for 12 h showed the highest percentage of humic acids (85.3%).Keywords: coal; humic acids; oxidation. INTRODUCCIÓNLa materia orgánica natural o humus contiene una fracción soluble en soluciones alcalinas llamadas sustancias húmicas, las cuales se forman por la descomposición del material vegetal y animal que se deposita en el suelo. Durante este proceso el material orgánico es inicialmente degradado y depolimerizado para posteriormente por acción microbiológica producir nuevos componentes con un alto grado de polimerización de coloración oscura y con un carácter no biodegradable con estructuras irregulares de alto peso molecular. 1Las sustancias húmicas se clasifican dependiendo del proceso de separación utilizado; los mayores componentes del humus son los ácidos fulvicos (AF) los cuales son solubles en medio ácido y los ácidos húmicos (AH) que son insolubles en medio ácido. [2][3][4] Estudios recientes indican que los ácidos húmicos están constituidos por clusters supramoleculares formados por el ensamblaje de bio-moléculas a través de enlaces químicos; los cuales se mantienen unidos por puentes de hidrogeno y por interacciones hidrofobicas y de van der Waals.5 Los ácidos húmicos están conformados por la unión de estructuras inalteradas de segmentos poliméricos de plantas y de fragmentos orgánicos con grupos del tipo carboxílico, fenólico, aldehído, cetonico, amido y amino. Esta composición estructural le confiere a los ácidos húmicos propiedades tales como su anfifilidad y su capacidad de intercambio catiónico. 5,6 Se estima que aproximadamente un cuarto del peso molecular de las sustancias húmicas se debe a los grupos oxigenados, principalmente grupos carboxílicos que aumentan con el grado de humificación de la materia orgánica y que pueden formar carboxilatos con metales presentes en el medio, grupos fenólicos que se forman en los etapas iniciales de humificación y grupos carbonilos que por reacciones de oxidación originan grupos carboxílicos. 5,6 Las sustancias húmicas desempeñan un papel importante en la naturaleza, ya que debido a sus grupos funcionales oxigenados participan en procesos de retención de cationes que son esenciales para las plantas además de retener el calor en la superficie debido a su color oscuro. 4 Entre los usos actuales de estas ...

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Long term effects of a brown coal-based amendment on the properties of soil humic acids

Cited by 50 publications

References 14 publications

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Effect of particle size and oxidant concentration in the yield of humic acids from mineral coal using response surface methodology

Aumento del contenido de ácidos húmicos en un carbón de bajo rango a través de la oxidación con aire y con peróxido de hidrogeno o ácido nítrico

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