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Definition of Humic acid
1. Noun. A dark brown humic substance that is soluble in water only at pH values greater than 2. "The half-life of humic acid is measured in centuries"
Definition of Humic acid
1. Noun. (chemistry) a complex mixture of organic acids produced by the decomposition of vegetable matter ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Humic Acid
Literary usage of Humic acid
Below you will find example usage of this term as found in modern and/or classical literature:
1. Chemistry in Its Application to Agriculture and Physiology by Justus Liebig, Lyon Playfair Playfair (1847)
"But according to the ob- on of chemists, humic acid is ... humic acid, when first
precipitated, is a flocculent substance, is soluble in 2500 times its ..."
2. Agriculture in Some of Its Relations with Chemistry by Frank Humphreys Storer (1897)
"humic acid and humin may be obtained artificially by boiling sugar, starch or gum
... Detmer in his turn detected as much as 1.5 % of nitrogen in humic acid ..."
3. Soil Conditions and Plant Growth by Edward John Russell (1917)
"On acidifying this alkaline extract the " humic acid " came down as a brown ...
It was further supposed that humic acid could be synthesised by boiling ..."
4. Hand-book of Chemistry by Leopold Gmelin, Henry Watts (1866)
"Saccharo-humic acid. — The acid produced in a similar manner to the last, ...
Ligno-humic acid. — Obtained from pale-brown rotten wood by boiling it with ..."
5. Blackwood's Edinburgh Magazine (1842)
"This humic acid being often tuet with in considerable quantities in fertile soils,
... Liebig has shown that the humic acid and its earthy compounds are so ..."
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