Relating ion binding by fulvic and humic acids to chemical composition and molecular size. 1. Proton binding.

@article{Christl2001RelatingIB,
  title={Relating ion binding by fulvic and humic acids to chemical composition and molecular size. 1. Proton binding.},
  author={Iso Christl and Ruben Kretzschmar},
  journal={Environmental science & technology},
  year={2001},
  volume={35 12},
  pages={2505-11}
}
Proton binding by a soil fulvic acid, humic acid, and a set of size fractions of the humic acid was studied as a function of pH and ionic strength by potentiometric titrations. The negative charge of the humic substances resulting from deprotonation of acidic functional groups generally increased with increasing pH and increasing ionic strength. At any given pH and ionic strength, the fulvic acid fraction exhibited much higher negative charge than the humic acid fraction. For the size… CONTINUE READING