Surface complexation modeling of arsenate adsorption on soil minerals
Conference
·
OSTI ID:126519
- Salinity Lab., Riverside, CA (United States)
Arsenic (As) is a toxic trace element that occurs naturally in some groundwaters of the semiarid southwestern United States and can be mobilized from soils during irrigated agricultural practices. The objective of this study was to evaluate the ability of surface complexation models to describe anion adsorption on the soil minerals {alpha}-FeOOH (goethite), {gamma}-Al(OH){sub 3} (gibbsite), kaolinite, montmorillonite, and illite in the single arsenate (As(V)) anion and binary arsenate-phosphate (As(V)/P) and arsenate-molybdate (As(V)/Mo) systems. Surface complexation constants for As(V), P, and Mo were optimized using experimental batch adsorption envelope data (adsorption vs. pH) from single anion systems. The constant capacitance model predicted competitive adsorption in binary As(V)/P systems. The minor influence of Mo on As(V) adsorption in the As(V)/Mo systems was predicted and was consistent with an experimentally-derived affinity order of P>=As(V)>Mo. The application of other surface complexation models to experimental adsorption data will also be discussed.
- OSTI ID:
- 126519
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Boron adsorption and silicon release by the clay minerals kaolinite, montmorillonite, and illite
Surface structures and stability of arsenic(III) on goethite: Spectroscopic evidence for inner-sphere complexes
Arsenate and chromate retention mechanisms on goethite. 2. Kinetic evaluation using a pressure-jump relaxation technique
Conference
·
· Soil Sci. Soc. Am. J.; (United States)
·
OSTI ID:6622239
Surface structures and stability of arsenic(III) on goethite: Spectroscopic evidence for inner-sphere complexes
Journal Article
·
Sat Aug 15 00:00:00 EDT 1998
· Environmental Science and Technology
·
OSTI ID:653155
Arsenate and chromate retention mechanisms on goethite. 2. Kinetic evaluation using a pressure-jump relaxation technique
Journal Article
·
Fri Jan 31 23:00:00 EST 1997
· Environmental Science and Technology
·
OSTI ID:460035