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Humic acids are a principal component of humic substances, which are the major organic constituents of soil (humus), peat and coal. It is also a major organic constituent of many upland streams, dystrophic lakes, and ocean water. It is produced by biodegradation of dead organic matter. It is not a single acid; rather, it is a complex mixture of many different acids containing carboxyl and phenolate groups so that the mixture behaves functionally as a dibasic acid or, occasionally, as a tribasic acid. Humic acids can form complexes with ions that are commonly found in the environment creating humic colloids. Humic acids are insoluble in water at acid pH, whereas fulvic acids are also derived from humic substances but are soluble in water across the full range of pH. Humic and fulvic acids are commonly used as a soil supplement in agriculture, and less commonly as a human nutritional supplement. As a nutrition supplement, fulvic acid can be found in a liquid form as a component of mineral colloids. Fulvic acids are poly-electrolytes and are unique colloids that diffuse easily through membranes whereas all other colloids do not.

Technological applications

The heavy-metal binding abilities of humic acids have been exploited to develop remediation technologies for removing heavy metals from waste water. To this end, Yurishcheva et al. coated magnetic nanoparticles with humic acids. After capturing lead ions, the nanoparticles can then be captured using a magnet.
Ancient masonry
In Ancient Egypt, according to archeology, straw was mixed with mud in order to produce building bricks. Straw produces stronger bricks that are less likely to break or lose their shape. Modern investigations have found that humic acid is released from straw when mixed with mud, basically a mixture of sand and clay. Humic acid increases clay's plasticity.