ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
2+ activity in solution. It is, therefore, important to assess the adsorption capacity of naturally occurring materials and evaluate their potential to reduce toxicity. The free Pb2+ activity was measured in the solution in equilibrium with ferrihydrite (a synthetic Fe oxide), two field-collected pedogenic amorphous oxides, and leaf compost. The experiment used a factorial design varying total Pb loading and solution pH. The results show that ferrihydrite was more efficient in lowering Pb aqueous concentration than the two pedogenic oxides. Furthermore, of the two pedogenic oxides examined, a higher Pb2+ activity was maintained in solution at equilibrium with the most crystalline phase, which also has a lower surface area relative to the other adsorbents. Leaf compost maintained a significantly higher free Pb2+ activity, relative to the various oxides. The experimental data could be fitted to a semi-mechanistic model predicting free Pb2+ activity as a function of total Pb loadings and pH, with R 2 varying from 0.77 to 0.92.
Type of Medium:
Electronic Resource
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