Actions for The sorption of humic acids to mineral surfaces and their roles in contaminant binding [electronic resource].

Email RIS file
Bookmark
Report an Issue

The sorption of humic acids to mineral surfaces and their roles in contaminant binding [electronic resource].

Published
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (15 pages) : digital, PDF file
Additional Creators
Pacific Northwest Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
Humic substances dissolved in groundwater may adsorb to certain mineral surfaces, rendering hydrophilic surfaces hydrophobic and making them sorbents for hydrophobic organic compounds (HOC). The sorption of humic and fulvic acids (International Humic Substance Society, IHSS, reference samples) on hematite and kaolinite was investigated to determine how natural organic coatings influence HOC sorption. The sorption behavior of the humic substances was consistent with a ligand-exchange mechanism, and the amount of sorption depended on the concentration of hydroxylated surface sites on the mineral and the properties of the humic substance. The sorption of the humic substances to two solids was proportional to their aromatic carbon content and inversely proportional to the O/C ratio. Increasing quantities of sorbed humic substances (f{sub oc}0.01 to 0. 5%) increased the sorption of carbazole, dibenzothiophene, and anthracene. Peat humic acid, the most aromatic coating, showed the greatest sorption enhancement of HOC when sorbed to hematite. In addition, HOC sorption was greater on organic coating formed at low ionic strength (I = 0.005) as compared to higher ionic strength (I = 0.1). We suggest that both the mineral surface and the ionic strength of the electrolyte affect the interfacial configuration of the sorbed humic substance, altering the size or accessibly of hydrophobic domains on the humic molecule to HOC. 30 refs., 5 figs.
Report Numbers
E 1.99:pnl-sa-18877
E 1.99: conf-9008177--1
conf-9008177--1
pnl-sa-18877
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
11/01/1990.
"pnl-sa-18877"
" conf-9008177--1"
"DE91005678"
5. International Humid Substance Society meeting, Nagoya (Japan), 6-10 Aug 1990.
Smith, S.C.; Murphy, E.M.; Phillips, J.L.; Zachara, J.M.
Funding Information
AC06-76RL01830
View MARC record | catkey: 14149401