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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.
It is an oxidation product of lignite, associated with near-surface mining. [1] 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]
Heat is used to increase the solubility of humic acids and hence more potassium humate can be extracted. The resulting liquid is dried to produce the amorphous crystalline like product which can then be added as a granule to fertilizer. The potassium humate granules by way of chemical extraction lose their hydrophobic properties and are now ...
It is reducible to a fine powder by trituration, and if submitted to the action of a weak solution of potash, it yields a considerable quantity of humic acid. [39] Leonardite is an oxidized form of lignite, which also contains high levels of humic acid. [58] Jet is a hardened, gem-like form of lignite used in various types of jewelry. [42]
And don't skip the suggested lemon wedges—the bit of acid helps cut through all the cream. ... PHOTO: JOSEPH DE LEO; FOOD STYLING: TAYLOR ANN SPENCER. Caprese Stuffed Chicken.
Geiseltal open-cast mining area, mapped at the 2 m thickness limit of the lignite. The Geiseltal, a peripheral area of the Central German Lignite Mining Area, is located about 20 km south of Halle (Saale) and about 10 km southwest of Merseburg in Saxony-Anhalt. It extends over a length of 15 km from west-northwest to east-southeast and over a ...
The good news for the milkvetch plant is that they usually need wildfire to sprout — meaning dormant seeds now have a massive new habitat for a new crop of the rare shrub.
The International Humic Substances Society maintains a collection of standard and reference samples of humic and fulvic acids extracted and fractionated from leonardite, river water, a mineral soil, and peat, plus natural organic matter isolated from river water by reverse osmosis, [4] without fractionation. [5]