Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy.

In a study published in the journal Environmental Science Technology the activity of different kinds of humic acid forms are compared in terms of their ability to bind to lead (Pb).  The group found that “Pb binding to humic substances (HS) increased with increasing pH and decreasing ionic strength.” http://www.ncbi.nlm.nih.gov/pubmed/24040886