Aluminum binding by humus

Conference · Tue Oct 01 00:00:00 EDT 1996

OSTI ID:370505

Benedetti, M F ^[1]; Hiemstra, T; Riemsdijk, W van ^[2]; Kinniburgh, D ^[3]

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1. URA, Paris (France)
2. WAU, Wageningen (Netherlands)
3. BGS-Wallingford, Oxon (United Kingdom)

The need for qualitative and quantitative description of the chemical speciation of Al, in particular and other metal ions in general, is stressed by the increased mobilization of metal ions in water and soils due to acid rain deposition. In this paper we present new data of Al binding to two humic acids. These new data sets and the some previously published data will be analyzed with the NICA-Donnan model using one set of parameters to describe the Al binding to the different humic substances. Once the experimental data is described with the NICA-Donnan approach, we will show the effect of Ca on Al binding and surface speciation as well as the effect of Al on the charge of the humic particles. The parameters derived from the laboratory experiments will be used to describe the variation of the field based Al partition coefficient.

• OSTI ID: 370505
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ALUMINIUM
BINDING ENERGY
DEPOSITION
ENVIRONMENTAL TRANSPORT
HUMIC ACIDS
HUMUS
SOILS
SURFACE PROPERTIES