Surface complexation modeling of arsenate adsorption on soil minerals
- 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-; TRN: 95:006086-0503
- Resource Relation:
- Conference: 209. American Chemical Society (ACS) national meeting, Anaheim, CA (United States), 2-6 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of 209th ACS national meeting; PB: 2088 p.
- Country of Publication:
- United States
- Language:
- English
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