1990
DOI: 10.1097/00010694-199007000-00003
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Analytical and Spectroscopic Characterization of Humic Acids Extracted From Sewage Sludge, Manure, and Worm Compost

Abstract: Humic acids from difgferent origin/source have been characterised, particularly by using spectroscopic technique

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Cited by 63 publications
(30 citation statements)
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“…In the HA series, the N/C atomic ratios are higher than in soil HA (N/C < 0,06). In GO-HA and RA-HA the N/ C values are close to those found in sewage sludge HA (N/ C = 0.13) 10 . Based on the H/C and O/C ratio values, the similarity of these HA with sediments of type III can be established, corresponding to recently formed humic substances, with a predominance of aromatic structures 11 .…”
Section: Methodssupporting
confidence: 72%
See 1 more Smart Citation
“…In the HA series, the N/C atomic ratios are higher than in soil HA (N/C < 0,06). In GO-HA and RA-HA the N/ C values are close to those found in sewage sludge HA (N/ C = 0.13) 10 . Based on the H/C and O/C ratio values, the similarity of these HA with sediments of type III can be established, corresponding to recently formed humic substances, with a predominance of aromatic structures 11 .…”
Section: Methodssupporting
confidence: 72%
“…The existence of carbohydrates in the samples is suggested 10 by one band at 1036-1028 cm -1 , although the assignment is not unequivocal due to the broad ν(Si-O) which appears in the same region. The IR spectra are consistent with the phenolic content, the low carboxylic acidity and the high %N of the samples.…”
Section: Resultsmentioning
confidence: 85%
“…Elas têm sido usadas para identificar a fonte da matéria orgânica. Razões N/C mais elevadas indicam estruturas orgânicas mais alifáticas e proteináceas 20 . Razões H/C altas, como no caso deste trabalho, indicam, também, estruturas mais alifáticas.…”
Section: Resultsunclassified
“…Nos AH novos aqui estudados, no entanto, podem representar também ligações quí-micas conjugadas em estruturas de grupos alifáticos insaturados. Estudos mostraram que este dado independe da concentração de material húmico, mas varia para materiais obtidos de diferentes tipos de solos e sedimentos 20 . A diminuição da razão E 4 /E 6 com o tempo de compostagem sugere também interações de blocos moleculares menores via quelação de íons metálicos ácidos duros, como Fe 3+ por exemplo, por grupos catecolatos oriundos da desmetilação de grupos metoxilas de estruturas do tipo siringila e/ou guaiacila.…”
Section: Resultsunclassified
“…Documentation have been established worldwide varying from characterization of HA isolated from different materials (Deiana et al, 1990;Lobartini et al, 1991&1992, Tan et al, 1992and Goenadi 1997), oxide adsorption (Schulthess & Huang, 1991;Fontess et al, 1992), soft-weed herbicide (Goenadi, 1995) as well as its potential use as organic N sources for callus development (Goenadi & Mariska, 1995).…”
Section: Introductionmentioning
confidence: 99%