Topic
Humic acid
About: Humic acid is a research topic. Over the lifetime, 13030 publications have been published within this topic receiving 330804 citations. The topic is also known as: humic acids & humin acids.
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01 Jan 1985
TL;DR: An Introduction to Humic Substances in Soil, Sediment, and Water GEOCHEMISTRY of Humic SUBSTances: Geochemistry of Soil Humics Substances, Geochemical properties of Humics in Natural and Cultivated Peatlands Humic substances in Groundwater Geochemistry and Ecological Role of Humicles in Lakewater Geochemical and ecological role of Humicity Substances and Humicity in Lake Sediments Geochemistry in Stream Fulvic and Humic Substances Geochemics of Humica in Estuarine Environments Geochemical of
Abstract: An Introduction to Humic Substances in Soil, Sediment, and Water GEOCHEMISTRY OF HUMIC SUBSTANCES: Geochemistry of Soil Humic Substances Geochemistry of Humic Substances in Natural and Cultivated Peatlands Humic Substances in Groundwater Geochemistry and Ecological Role of Humic Substances in Lakewater Geochemistry of Humic Substances in Lake Sediments Geochemistry of Stream Fulvic and Humic Substances Geochemistry of Humic Substances in Estuarine Environments Geochemistry of Humic Substances in Seawater Geochemistry of Humic Substances in Marine Sediments Geochemistry of Humin Nature of Nitrogen in Humic Substances ISOLATION AND FRACTIONATION OF HUMIC SUBSTANCES: Extraction of Humic Substances from Soil Isolation and Concentration Techniques for Aquatic Humic Substances Fractionation of Soil Humic Substances Fractionation Techniques for Aquatic Humic Substances CHARACTERIZATION OF HUMIC SUBSTANCES: Analytical Methodology for Elemental Analysis of Humic Substances Implications of Elemental Characteristics of Humic Substances Molecular Size and Weight Measurements of Humic Substances Acidic Functional Groups of Humic Substances Spectroscopic Methods (other than NMR) for Determining Functionality in Humic Substances Application of Nuclear Magnetic Resonance Spectroscopy for Determining Functionality in Humic Substances Concluding Remarks Bibliography Appendixes Index
803 citations
TL;DR: The incorporation of both types of vermicompost-derived humic acids, into either type of soilless plant growth media, increased the growth of tomato and cucumber plants significantly, in terms of plant heights, leaf areas, shoot and root dry weights.
777 citations
TL;DR: The NICCA-Donnan model as mentioned in this paper is a semi-empirical model that is similar to the NICA-donnan model except that it introduces an additional degree of scaling that ensures thermodynamic consistency and allows for variable stoichiometry of binding, which implicitly accounts for the large degree of chemical heterogeneity of humic particles.
775 citations
TL;DR: In this paper, the authors present data supporting a previously sug gested alternative dual-mode model of sorption in which dissolution and hole-filling mechanisms take place concurrently, as in glassy organic polymers.
Abstract: The widely accepted dissolution (partition) model of sorption to soil organic matter (SOM) has been challenged by evidence that SOM has a non-uniform sorption potential. This study presents data supporting a previously sug gested alternative dual-mode model of sorption in which dissolution and hole-filling mechanisms take place concurrently, as in glassy organic polymers. The holes are postulated to be nanometer-size voids within the organic matrix that provide complexation sites. The main focus was on sorption of chlorobenzene, 1,2-dichlorobenzene, and 1,3-dichlorobenzene, but some experiments were carried out also on 2,4-dichlorophenol and the herbicide metolachlor. Sorption from water to high-organic soils, humic acid particles, and poly(vinyl chloride) is nonlinear, competitive, and predictably responsive to conditions that affect hole populations such as temperature and co-solvent addition. Sorption to a peat soil and its components became progressively nonlinear and competitive in the order humic ac...
761 citations
TL;DR: Generic parameter values have been derived that can be used for modeling in the absence of specific metalion binding measurements and complement the previously derived generic descriptions of proton binding.
Abstract: Forty-nine datasets consisting of literature and experimental data for proton binding by fulvic and humic acids have been analyzed using the NICA-Donnan model. The model successfully described the behavior of the individual datasets with a high degree of accuracy and highlighted the differences in site density and binding affinity between fulvic acids (FA) and humic acids (HA) while demonstrating their strong similarities. The data have also been used to derive generic model descriptions of proton binding by FA and HA that can be used for modeling in the absence of specific parameter sets for the particular humic substance of interest. These generic parameters can provide estimates of the amount of proton binding by a wide variety of humic substances to within approximately ±20% under any given conditions. The maximum site density for protons was 7.74 and 5.70 equiv kg-1 for a generic FA and HA, respectively. The recommended generic NICA-Donnan parameter values for FA are b = 0.57, Qmax1,H = 5.88, log KH...
751 citations