Humic substances (HSs) are products of animal and plant decomposition. They contain more carbon than all living organisms. Humic acids (HAs) are the major HSs sub-group. HA properties have been described as “aliphatic-aromatic macromolecules with alcohol, amine, amide, carbonyl, carboxylic, phenol and quinone functional groups.” In this project we studied how the title nucleic acid constituents adsorb on a solid, iron(III)-loaded German-peat humic acid. Twenty samples of each adenine triad nucleic acid constituent were prepared at different concentrations and reacted with a constant amount of solid GHA. We then placed the samples in a thermostated shaker and used a UV spectrophotometer to study adsorption between 5-35 degrees Celsius in 5-degree increments. The data have been analyzed with a simple model and the results will be discussed.