Abstract
The sorption of anthropogenically derived arsenic to natural solids plays an important role in the mobility and fate of this toxic metalloid in the environment. The adsorption affinity of dissolved As V and As III to contrasting natural solids was investigated using model solutions of As V/As III and homogenized samples of soils, stream sediments and peat cores. The adsorption of As III and As V on investigated sorbents ran mostly according to the Langmuir model, with high correlation factors (>0.7). Sorption capacities varied from 3.5×10 -3 to 2.0×10 -1mmol/g of As, whereas As III achieved a higher adsorption affinity due to the presence of Fe ions in the model solution. The lower horizons of soils and the intact peat, characterized by high enrichment factors of As content (R>1), represented a more stable system with decreased adsorption/desorption dynamics of As transport. A higher surface activity of solids associated with R
Original language | English |
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Pages (from-to) | 456-461 |
Journal | Science of the Total Environment |
Volume | 433 |
DOIs | |
Publication status | Published - 1 Sept 2012 |
Keywords
- Adsorption
- Arsenic
- Peat
- Soil
- Stream sediment