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"Humic substances" is an umbrella term covering humic acid, fulvic acid and humin, which differ in solubility. By definition, humic acid (HA) is soluble in water at neutral and alkaline pH, but insoluble at acidic pH < 2. Fulvic acid (FA) is soluble in water at any pH. Humin is not soluble in water at any pH.
Dystrophic lakes, also known as humic lakes, are lakes that contain high amounts of humic substances and organic acids. [1] The presence of these substances causes the water to be brown in colour and have a generally low pH of around 4.0-6.0. [ 2 ]
Potassium humate is used in agriculture as a fertilizer additive to increase the efficiency of fertilizers especially nitrogen- and phosphorus-based fertilizer inputs. Other salts of humic acid are manufactured, mainly sodium humate, which is used in animal health supplements. It also can be used in aquaculture.
It is a rich source of humic acid (up to 90%) [2] and is used as a soil conditioner, as a stabilizer for ion-exchange resins in water treatment, [3] in the remediation of polluted environments and as a drilling additive. [4] It was named after A. G. Leonard, first director of the North Dakota Geological Survey, in recognition of his work on ...
The presence of tannins (or humic acid) in well water can make it smell bad or taste bitter, but this does not make it unsafe to drink. [25] Tannins leaching from an unprepared driftwood decoration in an aquarium can cause pH lowering and coloring of the water to a tea-like tinge.
Soil consists of both mineral (inorganic) and organic components. The organic components can be subdivided into fractions that are soluble, largely humic acids, and insoluble, the humins. Humins make up about 50% of the organic matter in soil. [1]
Humic acid is only water-soluble at a pH greater than 6.5, while fulvic acid is soluble at all pH ranges. Both resident acids have a property that enables them to reduce the surface tension of water when in solution. In contrast, it has been reported that soils with a deficiency of fulvic acid in solution would have more severe water repellency ...
This page needs to be linked to Water Quality and treatment for the purpose of making drinking (potable) water. The presence of humic acid in water intended for potable or industrial use can have a significant impact on the treatability of that water and the success of chemical disinfection processes. Accurate methods of estabishing humic acid ...
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