Derivatization and structural studies by spectroscopic methods of humic acids from Leonardite

Ricca, Giuliana; Severini, F.; Silvestro, Giuseppe Di; Yuan, Cui; Adani, Fabrizio

doi:10.1016/s0016-7061(00)00055-0

Cited by 17 publications

(12 citation statements)

References 15 publications

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“…Humic acids obtained from lignite using solutions of Na 2 P 4 O 7 with the highest A 4/6 values should be abundant in carboxyl groups content and low in aromatic structures. More specific information concerning the structure of the HA could be obtained from 13 C NMR spectroscopy (Qiang et al, 1993;Ricca et al 2000;Piccolo 2002;Zbytniewski and Buszewski, 2005;Pertusatti and Prado, 2007;Kwiatkowska-Malina 2009). Figure 1 shows solid-state 13 C NMR spectra of humic acids extracted from lignite using different solutions together with spectra of technical humic acids (KHtech) and their salt (KHsalt) from SigmaAldrich.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…Entre 1370 e 1440 cm -1 observam-se bandas devidas a grupos C-H alifáticos e vibração OH de álcoois ou ácidos carboxílicos. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Isso pode confirmar a menor aromaticidade das SHA, já que a maior porcentagem é de AF.…”

Section: Análise Espectroscópica No Infravermelho Com Transformada Deunclassified

Influência das características das substâncias húmicas aquáticas na eficiência da coagulação com o cloreto férrico

et al. 2009

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“…Tabela 2 -Comprimento de onda das principais bandas de absorção e atribuições das SH (ROCHA et al, 2000b;STEVENSON, 1994;RICCA et al, 2000). ( = 3).…”

Section: Caracterização Das Substâncias Húmicasunclassified

Influência do tamanho molecular aparente das substâncias húmicas aquáticas na eficiência da coagulação com sulfato de alumínio e cloreto férrico

Sloboda¹

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Aos funcionários do Instituto de Química pela ajuda e suporte técnico oferecido, Renatinha, Cidinha, Silvana, Mauro, Eliane (PAE), Andréia (Pós), Silvia (Pós) e aos funcionários da biblioteca. A todos meus amigos de Guarapuava, em especial a Daniela (Dany), Rosane (Ro), Roberta e Olga pela amizade e incentivo. As minhas amigas Elaine e Vera, pela amizade desde adolescência. A meus amigos do IQSC, Felipe, Renato (Chuck), Sidnei (Pufe), Sandra Alasfur, Wendel, Eduardo, Alexandre (Itapira), Kátia, Luciane (Lu), Leidimara (Leidi) enfim, a todos pela amizade, ajuda e inúmeros momentos de alegria vividos. Agradeço em especial a amizade da Raquel, da Goretti e da Keila pelos momentos inesquecíveis e por tudo o que passamos juntos. A minha mãe por ter me dado à vida, pelo amor incondicional, educação, e por sempre acreditar em mim. Por ter vencido a doença e ocupar o lugar de pai e mãe. Agradeço a Deus e a Nossa mãe Aparecida por ter concedido a cura a ela e por estar presente hoje em minha vida. Ao meu pai que tão cedo partiu da minha vida, mas aos 11 anos que com ele vivi, tive muitos ensinamentos que carrego sempre comigo.

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Derivatization and structural studies by spectroscopic methods of humic acids from Leonardite

Cited by 17 publications

References 15 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

Influência das características das substâncias húmicas aquáticas na eficiência da coagulação com o cloreto férrico

Influência do tamanho molecular aparente das substâncias húmicas aquáticas na eficiência da coagulação com sulfato de alumínio e cloreto férrico

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