Sorption of Humic Acids onto Aquifer Solids
Abstract
A study was made of the sorption of commercial Aldrich humic acid and IHSS Suwannee River humic acid onto three natural aquifer material solids from Barksdale AFB, Louisiana; Blytheville AFB, Arkansas and Columbus AFB, Mississippi. The interactions follow trends found in other humic acid-mineral sorption studies. Increase in pH caused sorption of humic acid on each sediment to decrease. Humic substances sorb more strongly to sediments with considerable surface areas, and surface iron coupled with substantial silt and clay percentages relative to sand. Humic acids with similar O/C ratios and aromatic content had similar strength buffer used governed the extent to which humics sorbed. Phosphate buffer competes with the humic acid for sorption onto the aquifer material solid. Perchiorate buffer tends to alter the structure of the humic acid causing it to have different sorption capacities on the aquifer solids. Sorption was greater on the aquifer solids at I = 0.1 M than at I = 0.005 M. All isotherms were evaluated for Freundlich, Langmuir and linear fits. The sorption data favored Freundlich-type statistical treatment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1997
- Accession Number
- ADA356438
Entities
People
- Michael J. Plana
Organizations
- California State University, Northridge