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Humic substances (HS) are organic compounds that are important components of humus, the major organic fraction of soil, peat, and coal. For a long era in the 19th and 20th centuries, humic substances were often viewed through a lens of acid–base theory that described humic acids (HA), as organic acids, and their conjugate bases, humates, as important components of organic matter. Through this viewpoint humic acids were defined as organic substances extracted from soil that coagulate when a strong-base extract is acidified, whereas fulvic acids (FA) are organic acids that remain soluble when a strong-base extract is acidified. The remaining alkali-insoluble part of humus would be termed humin.   Wikipedia

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