humic

1. Of or relating to humus (the natural substance, not the food).

plural humics

1. A derivative of humic acid.

   A number of recent publications […] claim previous studies have overestimated the importance of the aromatic moieties present in humics […]

   2005, Irina V. Perminova, Kirk Hatfield, Norbert Hertkorn, Use of Humic Substances to Remediate Polluted Environments, page 16

   2 more examples

   For waters with low concentrations of aquatic humics, the coagulant dose is controlled not by the humics but by the properties of the coagulant (pH and solubility for metal coagulants).

   1996, William C. Becker, Charles R. O'Melia, Optimizing Ozonation for Turbidity and Organics, page 11

   Freshwater chemists learned that rather than manipulate large volumes of water through a complex procedure in order to extract a few milligrams of humics or fulvics, a simple adsorption column of certain resins could collect […]

   2020, Roger S. Wotton, The Biology of Particles in Aquatic Systems, Second Edition