humic acid
noun
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.
Origin of humic acid
1First recorded in 1835–45
Words Nearby humic acid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use humic acid in a sentence
This deposit, if obtained from light brown peat, is ulmic acid; if from black peat, it is humic acid.
Peat and its Uses as Fertilizer and Fuel | Samuel William JohnsonThere is in this fermentation a large quantity of cold sour humic acid formed, which seriously impairs the value of the manure.
Manures and the principles of manuring | Charles Morton AikmanHis peat or humic acid tannage was patented by him about 1905, and is now worked on a commercial scale.
In soils that are acid through the accumulation of humic acid nitrification does not go on, and bacterial life is repressed.
Browse