Spectroscopic and elementary characterization of humic substances in organic substrates

da Silva, Rubens Ribeiro; Lucena, Guilherme Nunes; Machado, Ângela Franciely; de Freitas, Gilson Araújo; Matos, Antônio Teixeira; Abrahão, Walter Antônio Pereira

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dc.creator	da Silva, Rubens Ribeiro
dc.creator	Lucena, Guilherme Nunes
dc.creator	Machado, Ângela Franciely
dc.creator	de Freitas, Gilson Araújo
dc.creator	Matos, Antônio Teixeira
dc.creator	Abrahão, Walter Antônio Pereira
dc.date	2018-08-01
dc.date.accessioned	2023-03-30T19:35:08Z
dc.date.available	2023-03-30T19:35:08Z
dc.identifier	https://comunicatascientiae.com.br/comunicata/article/view/2734
dc.identifier	10.14295/cs.v9i2.2734
dc.identifier.uri	https://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/246800
dc.description	The humic substances, major constituents of the organic matter of the substrates, play an important role in plant development, including: the availability of nutrients, the generation of negative charges (CEC) and the buffering effect. Based on this, this study aimed to use the molecular absorption spectroscopy in the ultraviolet-visible region (UV-VIS), the vibrational spectroscopy Fourier transform infrared (FTIR) and the elementary analysis CHN/O techniques to characterize the humic acid (HA) and fulvic acid (FA) fractions of the humic substances of five organic substrates, named as T1, T2, T3, T4, and T5, which were produced at the Federal University of Tocantins – Campus Gurupi. The molecular absorption spectra in UV-VIS and FTIR on the T1, T2, T3, T4 and T5 substrates showed humification, the formation of negative charges, which is related to the cation exchange capacity (CEC) and the complexation of metal ions that are considered nutrients. The biggest humification was shown for the T4 substrate, in function of its higher cabon-acid humic/carbon-acid fulvic ratio and the lower C/N ratio, allied to a negative charge generation, the low E4/E6 ratio found in the humic acid fraction. The complexation of metal nutrient ions indicates the greatest potencial of its use for seedlings production and the conservation of the chemical and physical properties of the organic substrate.	en-US
dc.description	The humic substances, major constituents of the organic matter of the substrates, play an important role in plant development, including: the availability of nutrients, the generation of negative charges (CEC) and the buffering effect. Based on this, this study aimed to use the molecular absorption spectroscopy in the ultraviolet-visible region (UV-VIS), the vibrational spectroscopy Fourier transform infrared (FTIR) and the elementary analysis CHN/O techniques to characterize the humic acid (HA) and fulvic acid (FA) fractions of the humic substances of five organic substrates, named as T1, T2, T3, T4, and T5, which were produced at the Federal University of Tocantins – Campus Gurupi. The molecular absorption spectra in UV-VIS and FTIR on the T1, T2, T3, T4 and T5 substrates showed humification, the formation of negative charges, which is related to the cation exchange capacity (CEC) and the complexation of metal ions that are considered nutrients. The biggest humification was shown for the T4 substrate, in function of its higher cabon-acid humic/carbon-acid fulvic ratio and the lower C/N ratio, allied to a negative charge generation, the low E4/E6 ratio found in the humic acid fraction. The complexation of metal nutrient ions indicates the greatest potencial of its use for seedlings production and the conservation of the chemical and physical properties of the organic substrate.	pt-BR
dc.format	application/pdf
dc.format	application/pdf
dc.language	eng
dc.language	por
dc.publisher	Federal University of Piauí	en-US
dc.relation	https://comunicatascientiae.com.br/comunicata/article/view/2734/555
dc.relation	https://comunicatascientiae.com.br/comunicata/article/view/2734/731
dc.rights	Copyright (c) 2018 Rubens Ribeiro Silva, Guilherme Nunes Lucena, Ângela Franciely Machado, Gilson Araújo Freitas, Antônio Teixeira Matos, Walter Antônio Pereira Abrahão	en-US
dc.source	Comunicata Scientiae; Vol. 9 No. 2 (2018); 264-274	en-US
dc.source	Comunicata Scientiae; v. 9 n. 2 (2018); 264-274	pt-BR
dc.source	2177-5133
dc.source	2176-9079
dc.subject	fulvic acids	en-US
dc.subject	humic acid	en-US
dc.subject	organic waste	en-US
dc.subject	fulvic acids	pt-BR
dc.subject	humic acid	pt-BR
dc.subject	organic waste	pt-BR
dc.title	Spectroscopic and elementary characterization of humic substances in organic substrates	en-US
dc.title	Spectroscopic and elementary characterization of humic substances in organic substrates	pt-BR
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	Artigo Científico	pt-BR