The study of Pb(II) binding to the system humic acid/goethite in acidic medium is reported in the present paper. From a macroscopic point of view, we have constructed the experimental sorption isotherms (using atomic absorption spectroscopy) and compared them with the prediction of the additivity rule. It is found that this system presents positive deviations, that is, the amount sorbed is abou...

The dissimilatory Fe(III) reducer Geobacter metallireducens reduced Fe(III) bound in humic substances, but the concentrations of Fe(III) in a wide range of highly purified humic substances were too low to account for a significant portion of the electron-accepting capacities of the humic substances. Furthermore, once reduced, the iron in humic substances could not transfer electrons to Fe(III) ...

Knowledge of the structure-property-function relationship of humic substances (HSs) is key for understanding their role in soil. Despite progress, studies on this topic are still under discussion. We analyzed 37 humic fractions with respect to their isotopic composition, structural characteristics, and properties responsible for stimulating plant root parameters. We showed that regardless of th...

Increased use of humic substances in agriculture has generated intense interest among producers, consumers, and regulators for an accurate and reliable method to quantify humic acid (HA) and fulvic acid (FA) in raw ores and products. Here we present a thoroughly validated method, the new standardized method for determination of HA and FA contents in raw humate ores and in solid and liquid produ...

subsequent accretion of layers of the complexes might represent a combination of chemical and physical proSince twice as much C is sequestered in soils as is contained in the tection from enzymes. atmosphere, the factors controlling the decomposition rate of soil C are important to the assessment of the effects of climatic change. Humic substances are operationally defined, but have The formati...

Mumio (shilajit), a substance similar to asphalt or resin that oozes from rocks during hot sunny days, mostly in caves the Himalayas, is known as medicinal Eastern medicine. It slowly being accepted by Western healing well mainly contains fulvic acids, humic acids and number of other substances. The article summarizes recent information about this substance.
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1. Abril, A., Merlo, C., Noe, L., 2013. Realistic soil C sink estimate in dry forests of western Argentina based on humic substance content. Journal Arid Environments 91, 113-118. https://doi.org/10.1016/j.jari.... CrossRef Google Scholar

Since the day humic substances have been isolated by Berzelius, they are commonly considered polymeric in nature. The biopolymer theory became so popular that the concept was embraced by most scientists for more than 1.5 centuries. It has provided a suitable hypothesis that is among other things not running afoul of with the elemental composition of the humic compounds, which shows relatively c...