Acid−Base Properties of Humic and Fulvic Acids Formed during Composting

2005 ◽  
Vol 39 (18) ◽  
pp. 7141-7146 ◽  
Author(s):  
César Plaza ◽  
Nicola Senesi ◽  
Alfredo Polo ◽  
Gennaro Brunetti
Keyword(s):  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
Acid Base ◽  
Base Properties

scholarly journals Dependence on molecular weight of acid-base properties of humic and fulvic acids

Analusis ◽  
1998 ◽  
Vol 26 (5) ◽  
pp. 214-218 ◽  
Author(s):  
A. Falzoni ◽  
R. Seeber ◽  
D. Tonelli ◽  
C. Ciavatta ◽  
C. Gessa ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
Acid Base ◽  
Base Properties

scholarly journals New possibility for characterization of dissociation behaviour of supramolecular electrolytes: results obtained for the International Humic Substances Society standard and reference samples by coulometry

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Martina Klučáková
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Humic Substances ◽  
Functional Groups ◽  
Dissociation Constants ◽  
Fulvic Acids ◽  
Molecular Organization ◽  
Humic And Fulvic Acids ◽  
Acid Base ◽  
Reference Samples

Abstract Background Humic substances can be considered as polyelectrolytes with supramolecular character and complicated behaviour in water environment. The fractions of humic substances dissolved in water are the most active ones and determinative for their functioning in nature, where the proton-binding and dissociation ability play a crucial role. The dissociation behaviour of humic and fulvic acids can be affected by different circumstances including their concentration which is directly connected with the molecular organization of humic particles in solution and the accessibility of their ionizable functional groups. This study is focused just on these active fractions and their dissociation behaviour in the dependence on their content in studied system. Results Standards and reference samples of International Humic Substances Society were used. Flow-through coulometry was used to determine the total content of acidic functional groups in fulvic solutions and humic leachates. The amount of dissociated acidic groups was determined on the basis of potentiometry. Several differences between the behaviour of humic and fulvic acids were found. While whole samples of fulvic acids including the weakest functional groups were analysed, only the active dissolved humic fractions containing stronger acidic functional groups were characterized. The fractions containing higher amounts of the weakest functional groups remained insoluble. The dissociation degree of fulvic acids decreased with their increasing content, but a maximum on its concentration dependence obtained for humic acids was observed. Conclusions Two different values of dissociation constants were determined for each sample. The first was determined on the basis of the extrapolation of infinite dilution, second was determined as their average value in the region of high concentrations in which it was constant. Obtained values characterize the functioning of dissolved humic substances from point of view of their dissociation ability. The results obtained by this approach can help to predict the acid–base behaviour of dissolved organic carbon in soil and generally in nature. The acid–base behaviour of dissolved organic carbon depends on its ratio to water. It behaves differently in soil which is dry and in soil which is wet or saturated by water.

Acid-base properties of fulvic acids extracted from an untreated sewage sludge and from composted sludge

1998 ◽  
Vol 32 (2) ◽  
pp. 441-449 ◽  
Author(s):  
Joaquim C.G.Esteves Da Silva ◽  
Adélio A.S.C. Machado ◽  
Mónica A.B.A. Silva
Keyword(s):  
Sewage Sludge ◽  
Fulvic Acids ◽  
Acid Base ◽  
Untreated Sewage ◽  
Composted Sludge ◽  
Base Properties

Study of the acid–base properties of three fulvic acids extracted from different horizons of a soil

1999 ◽  
Vol 385 (1-3) ◽  
pp. 443-449 ◽  
Author(s):  
S Fiol ◽  
R López ◽  
A Ramos ◽  
J.M Antelo ◽  
F Arce
Keyword(s):  
Fulvic Acids ◽  
Acid Base ◽  
Base Properties

Evaluation of the Properties of Humus Liquid of Earthworm Eisenia Foetida Obtained from Different Rachis

2017 ◽  
Vol 3 (02) ◽  
Author(s):  
Ramiro Remigio Gaibor Fernández ◽  
Abraham Adalberto Bayas Zamora ◽  
Galo Israel Muñoz Sánchez ◽  
Cristhian Adrián Rivas Santacruz
Keyword(s):  
Plant Growth ◽  
Fulvic Acids ◽  
Cattle Manure ◽  
Eisenia Foetida ◽  
Humic And Fulvic Acids ◽  
Livestock Manure ◽  
A Value ◽  
The One ◽  
Liquid Slurry

The objective of the present investigation was to evaluate the physical characteristics of the vermicompost and the quality of the purine of the red Californian (Eisenia foetida) using different substrates of feed for these worms. For this purpose, nine treatments were studied: 75% African palm rachis + 25% cattle manure, 50% African palm rachis + 50% cattle manure, 25% African palm rachis + 75% livestock manure, 50% manure of cattle, 50% of manure of cattle, 25% of manure of cattle, 50% of manure of cattle, 50% of manure of cattle, 50% of rach of coconut + 50% of manure of Livestock, 25% coccus rachis + 75% livestock manure. The substrate made up of 50% of rachis of coconut and 50% of livestock manure can be used in nurseries or nurseries for being the one that registered a value of pH 7.3 plus the closest to the neutral compared to the others, besides this (75% of oil palm rachis and 25% of cattle manure) showed a higher content of humic and fulvic acids (0.87 and 0.45 p / p, respectively), compounds that are important for agriculture by stimulating plant growth, in addition to this reflection 0.06% sulfur content, 4.0 ppm boron, 7.0 ppm copper, 47.5 ppm iron, 6.0 ppm manganese, with a presence of microorganisms of the species Trichoderma, Penicillium, Cladosporium sp. in amounts of 1.91x105 UFC / ml, however in this substrate was obtained between 13.3 and 43.5% less liquid slurry in Comparison with other treatments.

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