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"

Generic synonyms: Humic Substance



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

Humic Acid Pictures

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Lexicographical Neighbors of Humic Acid

humeroradial
humeroradial articulation
humeroradial joint
humeroscapular
humeroulnar
humeroulnar head of flexor digitorum superficialis muscle
humeroulnar joint
humerus
humf
humfed
humfing
humfs
humhum
humhums
humic
humic acid (current term)
humic acids
humic shale
humic substance
humicolous
humicubation
humicubations
humid
humid heat
humid heats
humid tetter
humider
humidest
humidex
humidexes

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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