Fulvic acids and the fulvic acid fraction of soil: Nature, properties, and isolation methods (A review)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Data reflecting the concepts of different researchers concerning the chemical composition and properties of fulvic acids as an individual humus constituent, a mixture of substances, or a destruction product of humic acids are reviewed. The history of their study, the meaning and historical significance of the terms "crenic, apocrenic," and "fulvic acids," and methods for their preparative separation (the ammonium carbonate, barite, Forsyth, and IHSS procedures) are examined. The composition of fulvic acids and their yields obtained by different methods are discussed, as well as their distinctions from the acid-soluble humus fraction.