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humic acid

American  

noun

  1. a brown, melanin-tinted mixture of polymers, found in lignite, peat, and soils, where it acts as a cation exchange agent: used in drilling fluids and inks.


Etymology

Origin of humic acid

First recorded in 1835–45

Example Sentences

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Organic-rich soils seem particularly problematic; they are ripe with molecules like humic acid, which behaves like DNA and can foul later sequencing.

From Science Magazine Dec. 10, 2019

Lignite coal is the main raw material for Yongye’s humic acid products, according to filings.

From BusinessWeek Jun. 22, 2011

The purchase of the humic acid supplier opened access to raw materials, said Yu.

From BusinessWeek Jun. 22, 2011

It is tasteless, insoluble in alcohol and ether, and is described by Dana as an acid substance, or mixture of different acids, related to humic acid.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" by Various

Our land cost so much to reclaim for hay, being soaked in humic acid, that we had always to import that commodity at a cost which made more cows than absolutely essential very inadvisable.

From A Labrador Doctor The Autobiography of Wilfred Thomason Grenfell by Grenfell, Wilfred Thomason, Sir

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